Saeed Khezri; Ja'far Maleki
Volume 20, Issue 79 , November 2011, , Pages 61-65
Abstract
In this research, the method of extraction and identification of hot and cold water springs using thermal images of TM and ETM+ is investigated. The process is as follows. After taking images from the TM and + ETM sensors on different dates and implementing geometric and radiometric corrections on the ...
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In this research, the method of extraction and identification of hot and cold water springs using thermal images of TM and ETM+ is investigated. The process is as follows. After taking images from the TM and + ETM sensors on different dates and implementing geometric and radiometric corrections on the images, surface temperature (LST) for the images is extracted using existing relations. Of course, this requires NDVI and emission extraction for the studied areas due to the certain effect of vegetation on surface temperature. This was carried out in TM and + ETM images using bands 3 and 4 . After the extraction of surface temperature by using limits and surface profiles in different directions and by using high pass filters, and finally matching vector layers related to the location of the springs on available images prepared by GPS during the fieldwork, the ability of TM and ETM+ images to identify the springs was evaluated. The results show that the use of images of cooler seasons has a higher priority and importance in comparison with the warmer seasons for the identification and extraction of thermal points and thermal anomalies of the surface of the earth on the images. The reverse is true for the identification of cold springs. Furthermore, the size and temperature of springs regarding their geographical location can be effective factors in identifying and separating these resources.
Mohammad Reza Rezvani; Mahdieh Ranjbar; Saeed Negahban
Volume 19, Issue 74 , August 2010, , Pages 61-68
Abstract
A general overview of the process of changes in the country's rural population shows that in the year 1956, about 69 percent of the country's population was in rural areas and 31 percent in the cities. This proportion has faced with decreasing share of rural population and increasing share of urban population ...
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A general overview of the process of changes in the country's rural population shows that in the year 1956, about 69 percent of the country's population was in rural areas and 31 percent in the cities. This proportion has faced with decreasing share of rural population and increasing share of urban population during the past years, so that it has reached 38 percent of the rural population and 62 percent of the urban population in the year 1996. This article tries to investigate the trend of changes in the number of population and settlements in Aradan district located in Garmsar city of Semnan province during the years 1966-2006. The research methodology is a descriptive-analytical method based on field and secondary methods. The results show that between 1966-76 popuation has grown in 15% of Aradan villages, 71.91% were faced with population decline and only 1% of villages had constant growth. In the years 1976 to 1986, the percentage of villages with increasing growth rates decreased compared to previous decade, from 26.31% to 20.37%. In contrast, the percentage of villages with negative growth has decreased from 71.91% to 51.84%. The survey on the growth status of Aradan villages between 1986 and 1996 showed that the percentage of villages that have an incremental growth rate in this period decreased from 20.37% in the 1976-1986 to 9.09%. By contrast, the villages with negative growth have increased from 51.84% to 54.43%. In the period 1996-2006, the percentage of positive growth of villages increased from 9.09% to 19.64% and the negative growth rate decreased from 54.43% to 48.2%.
Ma'sumeh Rajabi
Volume 17, Issue 67 , October 2008, , Pages 62-68
Abstract
The present study is an attempt to provide specific and special landforms from northwest of Iran. It is necessary to explain that in this part of Iran, the forms of construction are significantly developed, but at the same time, numerous and interesting evidence of climatic forms are also found. Meanwhile, ...
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The present study is an attempt to provide specific and special landforms from northwest of Iran. It is necessary to explain that in this part of Iran, the forms of construction are significantly developed, but at the same time, numerous and interesting evidence of climatic forms are also found. Meanwhile, aerial photos are also important in investigations of dynamical geomorphologic factors and phenomena such as movement of material masses, including landslides, the study of erosion factors including shore, river, etc.; therefore, among the presented forms and explanations, some cases have also been dedicated to this section.
Khosro Khajeh (Translator)
Volume 6, Issue 22 , August 1997, , Pages 62-64
Abstract
In recent years, the developments in creating and extracting spatial data have led to emergence of operational tools in the form of geographic information systems. It is these developments that have opened our eyes to infrastructural issues about the manner and reasons of these systems’ operation. ...
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In recent years, the developments in creating and extracting spatial data have led to emergence of operational tools in the form of geographic information systems. It is these developments that have opened our eyes to infrastructural issues about the manner and reasons of these systems’ operation. What is a geographic information system? A tool? A piece of a software? Or a complex system involving software, hardware, people and organizations?
What is the difference between the newly coined terms of “geomatics” and “geo-automatics”? do they have the same meaning or are they different? Some of these questions have been answered clearly. Some of them raise more fundamental issues. Nevertheless, the common aim of all these discussions is spatial data and information.
Today, geo-informatics, geomatics and GIS are frequently applied, but they should be viewed in light of developments in creation and extraction of spatial data over the past three decades.
Daniel Krinsli
Volume 5, Issue 20 , February 1996, , Pages 62-64
Abstract
These playas cover from 25 to 528225 square kilometers (Dasht-e Kavir). Thirty-three playas have areas less than 300 square kilometers, and except Dasht-e Kavir, the largest playa is 4685 square kilometers wide.
Twenty playas were studied directly on the ground, twenty by low-height airplane flights ...
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These playas cover from 25 to 528225 square kilometers (Dasht-e Kavir). Thirty-three playas have areas less than 300 square kilometers, and except Dasht-e Kavir, the largest playa is 4685 square kilometers wide.
Twenty playas were studied directly on the ground, twenty by low-height airplane flights and twenty by aerial photographs. The goal of these studies was to prepare maps and identify hydrological and lithological conditions and their genesis.
Iran’s playas have been usually formed on low lands, and a number of them are located amongst mountains. Climate, vegetation, lithology, structure, terrain and water catchment and drainage systems are the main creators of the environment and shape of playas.
Hiva Elmizadeh
Volume 18, Issue 71 , November 2009, , Pages 63-67
Abstract
Basically, the establishment and emergence of a city is more than anything subject to environmental conditions and geographic location, since natural features and phenomena have a decisive influence on location, dispersion, penetration area, physical development, urban morphology and the like, and sometimes ...
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Basically, the establishment and emergence of a city is more than anything subject to environmental conditions and geographic location, since natural features and phenomena have a decisive influence on location, dispersion, penetration area, physical development, urban morphology and the like, and sometimes act as a positive and temporal factor, and in some cases as a negative and deterrent one (Rev. 1382, p. 133). In recent decades, the city of Karaj has gone through a great deal of physical development due to the increase in population, and the increasing expansion of urban space without regard to geomorphologic processes has caused problems that are studied. In this research, the attempt will be made to analyze briefly the geomorphic phenomena and processes affecting the locating process in the city of Karaj, and to remind the urban planners of the consequences of failure to pay them due attention.
Hosseyn Azizi
Volume 22, SEPEHR , April 2013, , Pages 64-67
Abstract
Geomorphology is a very good guide for urban planning. Geomorphologic maps not only propose new ideas regarding the variables of the perspective, but also indirectly facilitate evaluation of resources in an environment. The present article demonstrates the capability of satellite data in identifying ...
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Geomorphology is a very good guide for urban planning. Geomorphologic maps not only propose new ideas regarding the variables of the perspective, but also indirectly facilitate evaluation of resources in an environment. The present article demonstrates the capability of satellite data in identifying main geomorphologic units in an industrial area like Korba city. Moreover, it is possible to identify the importance of the area using geomorphologic maps along with other geo-information like Lithology and geology structures. Each area is appropriate for a special kind of development and urban planning. The present article emphasizes on how a simple perspective like logical accumulation of geomorphologic and geologic information can provide valuable input for urban planning and development.
Samad Abdi; Mohammd Hossein Ramesht
Volume 21, Issue 82 , September 2012, , Pages 64-70
Abstract
Since climatic changes, especially those of the fourth quaternary period have always changed landforms, identifying and detecting traces of these changes is an important topic for geomorphologists. Natural glacier remains from this period are one of the most important evidences of climatic changes and ...
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Since climatic changes, especially those of the fourth quaternary period have always changed landforms, identifying and detecting traces of these changes is an important topic for geomorphologists. Natural glacier remains from this period are one of the most important evidences of climatic changes and evolutions.
The present article detects and identifies glacial traces in Buanat basin. While identifying and introducing glacial traces of the fourth quaternary period using the usual geomorphic methods, it reconstructs environmental conditions in the coldest glacial phase and investigates the previous water-ice balance in the area. In this regard, annual average temperature in the area under study was 9.6 °C colder and precipitation in lower altitudes was 1.2 to 1.8 more than today which prepared appropriate conditions for glacier activity. Moreover, geomorphic evidences like glacial cirque, glacial valleys, and hanging valleys in the area prove the presence of glacial traces in the basin.
Findings of the present study proves the presence of glacial traces in the basin and provides the basis for future soil and water studies and land use planning.
Ali Hanafi
Volume 23, Issue 89 , May 2014, , Pages 67-71
Abstract
Weathering happens with the breaking and transformation of ground surface stones, due to physical, chemical or biological processes. Wind, water, climate, plant and animal factors can cause weathering. The present study is performed based on Louis Peltier models in which two variables of average temperature ...
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Weathering happens with the breaking and transformation of ground surface stones, due to physical, chemical or biological processes. Wind, water, climate, plant and animal factors can cause weathering. The present study is performed based on Louis Peltier models in which two variables of average temperature and precipitation were used. Applying these two variables, Peltier distinguished 7 models which can describe different forms of weathering. Among these, two models of weathering regimes and morphogenetic regimes were investigated in Iran and related regimes of each station were determined based on the related graphs. To study and investigate weathering and geomorphologic areas across the country, climatic data including average annual precipitation and temperature were collected from 143 stations in Meteorological Organization portal with appropriate data and statistical period. The collected data were registered in a GIS database. After investigating the temperature and precipitation trend of the country, the regime of each station was determined using Peltier models and a weight was assigned to it. Then, they were registered into the mentioned database and related maps were produced in Arcmap. Results indicate that 5 of 9 morphogenetic situations of Peltier models occur in Iran climatic situation, so the central plateau, east and west of the country are mostly located in arid zone. Mountainous areas, Zagros and Alborz elevations have semi-arid regime, and stations located in southern coasts of the Caspian Sea and western hillsides of Zagros have a mild regime. Regarding weathering, areas in the central plateau and southern part of the country have a very low level of weathering, mountainous areas like Zagros and Alborz elevations and North West of the country have a weak level of mechanical weathering. Some stations in Northern Alborz and western hillsides of Zagros have average chemical weathering with frost and in some stations on the southern coasts of the Caspian Sea, severe chemical weathering occur.
Fatemeh Zabol Abbasi; Morteza Asmari Sadabad
Volume 21, Issue 83 , November 2012, , Pages 70-72
Abstract
Precipitation and temperature can be considered among the most important climatic elements in any area. Phenomena like sudden increase or decrease in temperature and precipitation during a year or more can be considered a reason for climate change in the area. The present article applies usual time series ...
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Precipitation and temperature can be considered among the most important climatic elements in any area. Phenomena like sudden increase or decrease in temperature and precipitation during a year or more can be considered a reason for climate change in the area. The present article applies usual time series method to investigate annual and seasonal changes in temperature and precipitation in Bandar-e Lenge synoptic station during the statistical period (1966-2000). Analysis indicate that average precipitation in Bandar-e Lenge during the statistical time period is 154.7 mm. Standard deviation and coefficient of precipitation changes are respectively 96.7 and 63 percent. Seasonal trend of precipitation changes in the statistical period indicates that precipitation showed a decreasing trend in spring and summer and an increasing trend in autumn and winter. Seasonal distribution of precipitation in Bandar-e Lenge during the above mentioned period (spring to autumn) contains 7, 2, 21, 70 percent of the annual precipitation respectively. In order to determine annual temperature, frequency of decreasing periods, definite temperature increase and degree of changes in each thermal period were calculated. Temperature changes more severely in summer and autumn, while the frequency of changes in winter and spring is more orderly. Moreover, the statistical period of 1966-70 is introduced as the most arid period of the study years.
Mahmoud Mahdinejad; Behnam Moghani Rahimi
Volume 19, Issue 73 , May 2010, , Pages 78-82
Abstract
The occurrence of the industrial revolution and, consequently, the emergence of unbridled urbanization created such a density of cars, iron and … in the cities, which faced the inhabitants of these places with many physical and mental problems. On the other hand, the expansion and development ...
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The occurrence of the industrial revolution and, consequently, the emergence of unbridled urbanization created such a density of cars, iron and … in the cities, which faced the inhabitants of these places with many physical and mental problems. On the other hand, the expansion and development of transportation has been so rapid and sudden that the topic of the global village is already realized and tourism has become an important and influential industry that can be the source of many changes, especially in the economic dimension. What is clear is that a country or region can be successful in this regard provided it has comprehensive plans for coherent decision-making and effective management of tourism. The main objective of this paper is to address the potentials and abilities of the urban environment of Shiraz in the field of tourism, review weaknesses and shortcomings, and finally provide some solutions for these deficiencies. Obviously, Shiraz, as the largest and most beautiful city in the southern half of the country that also suffers from numerous problems including unemployment, will be able, by taking these facts into consideration, to play an effective role in the prosperity of the region’s economy by increasing income and creating employment.
Rahim Sarvar; Iraj Yahyapoor
Volume 23, SEPEHR , July 2014, , Pages 80-88
Abstract
With increasing growth of urban population and urban development, the necessity of building new public service centers and determining an optimal place for them have become obvious. Due to dramatic increase in population, chaotic development of the city, and increase in the number of vehicles manufactured ...
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With increasing growth of urban population and urban development, the necessity of building new public service centers and determining an optimal place for them have become obvious. Due to dramatic increase in population, chaotic development of the city, and increase in the number of vehicles manufactured in the metropolis, Tehran faces a shortage of appropriate places for parking vehicles in crowded areas. Optimal locating of public parking lots is an approach and solution for traffic dilemma. Geographic information systems and Boolean logic are appropriate systems for finding the most optimal place for building Multi-story parking lots. This article investigates and evaluates multi-story parking lots in Tehran 15th district, considering parameters like attractive centers for travelers, access networks and urban passages, quality-structure, traffic junctions, different useful land uses, etc. Analytic hierarchy process (AHP) was used to weight the above mentioned parameters, and Boolean logic was used to overlap produced layers. After applying final weights retrieved from AHP model and overlapping produced layers, optimal sites for locating Multi-story parking lots were determined. Finally, suggestions were proposed according to the results and requirements of time and space.
Ali Khaksari; Maryam Abbasi
Volume 22, Issue 88 , January 2014, , Pages 106-114
Abstract
Over time, Tourism industry has reached such a brilliance and economic justification which has made it the third most beneficial industry (after oil and transportation industry). Although Iran is among the ten top countries of the world regarding historical, cultural and natural resources, it assumes ...
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Over time, Tourism industry has reached such a brilliance and economic justification which has made it the third most beneficial industry (after oil and transportation industry). Although Iran is among the ten top countries of the world regarding historical, cultural and natural resources, it assumes less than 1 percent of global earnings in tourism industry. Chahar Mahal va Bakhtiari, and especially Kouhrang is a beautiful area with a pleasant climate surrounded by high mountains of Zagros mountain range. The appropriate climate condition provides a situation for the development of tourism departments. The existence of many natural attractions is one of the distinguished features of the area, and we can hope to develop the tourism industry of the area by establishing appropriate tourism infrastructures and exploiting their capabilities in tourist attraction. The present article seeks to identify the tourism potentials of Kouhrang area and provide appropriate solutions for the tourism development of the area. Using Delphi questionnaire, field study, and interview, it identifies tourism potentials of the area and defines weak and strong points, threats and opportunities according to SWOT method, while weighting and prioritizing the strategies mentioned for the development of tourism in Kouhrang area. Analyses indicate that Cheshme Kouhrang waterfall, Sheykh Ali Khan waterfall, Chema ice cave, Dime spring, Emam Zade Sar Aqa Seyed, Chelgard ski resort, Lalehaye Vajgoon plain are among the tourism attractions of the area. In order to develop tourism in the studied area, tourism development programs must prioritize conservative strategy.
Seyyed Asadollah Hejazi; shabnam mahmoodi
Abstract
Abstract[1]
One of the most important erosion processes in desert areas, including the study area (east of Jask city), is wind erosion, which leads to various erosion forms, including sand dunes. The importance of studying the sand dunes in this area is due to the fact that, these hills, if moving, ...
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Abstract[1]
One of the most important erosion processes in desert areas, including the study area (east of Jask city), is wind erosion, which leads to various erosion forms, including sand dunes. The importance of studying the sand dunes in this area is due to the fact that, these hills, if moving, bring damages to the natural resources, human facilities and so on.Therefore, studying sand dunes is important in managing these areas. One of the first features that is studied in most researches related to desert areas, including wind erosion, routing the motion of the sand dunes, etc., is a feature related to the texture of sand particles.Therefore, in the present study, the textural characteristics and deposition environment of sand sedimentation have been investigated.The study area is part of the desert coast and is located east of Jask city and in Hormozgan province. This research is based on the sample collection of the site and the study of sedimentary texture using the results of granulometry and microscopic and macroscopic examination of sediments after preparation.To calculate the textural parameters such as the mean, sorting and bending, the instantaneous method was used and the charts were prepared using Excel software. The maps were prepared using topographic maps and satellite imagery in GIS software. A geological map was also used to study lithology. The results indicate the closeness of the mean diameter of the grains and indicate the lack of energy fluctuation in the sedimentation environment. Negative bending, good sorting, the presence of marine fossils and the presence of transparent grains in specimens 1, 2, 5 indicate coastal origin for these specimens. Positive bending, good sorting, bimodal histogram curve and upward curvature of cumulative curves in samples 6, 7, 9, and 10 indicate the presence of flooding materials of the river and side sediment.Therefore, the river origin can be imagined for these samples.
[1] - به دلیل کیفیت نامناسب متن چکیده مبسوط انگلیسیِ ارائه شده توسط نویسنده مسئول مقاله، نشریه به ناچار اقدام به ترجمه مجدد متن چکیده فارسی و انتشار آن به جای چکیده مبسوط انگلیسی نموده است.
Zeynab Aliabadi; Mahid Nastaran; Farzane Pirani; Farzane Sheikhzade
Abstract
Extended Abstract Introduction The deployment of every urban element in the position of the body - a particular area of the city - is subjected to certain principles, rules and procedures that, if followed, will ensure the success and effectiveness of thatelement in the same place, otherwise there will ...
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Extended Abstract Introduction The deployment of every urban element in the position of the body - a particular area of the city - is subjected to certain principles, rules and procedures that, if followed, will ensure the success and effectiveness of thatelement in the same place, otherwise there will be many problems with the occurrence it does.Therefore, achieving equilibrium in the spatial distribution of resources and services is the main goal of the planners. Considering the importance of locating and its position in various projects, the importance of the location of the fire stations and the direct impact on its model and performance will be determined. Provision of fire station services requires their proper location in order to distribute them appropriately to minimize their financial losses.Locating fire stations and determining the number and location of stations guarantee the safety of citizens in the event of any incident. Due to the high importance of the 3rd district of Isfahan among other areas of the city, attentionto safety issues in this context is urgently needed. The 3rd district of Isfahan is the heart of the city which has an ancient heritage. One of the important issues facing urban management is the timely delivery of firefighting during a fire.There was no responsive station in this area. Thus, the need to address the problem of locating and distributing fire stations is of great importance in urban planning. Therefore, the choice of optimal location and appropriate distribution of fire stations will bethe overall goal of this study to increase the safety level. Materials & Methods The present research is a descriptive-analytic research in terms of purpose, and an applied research in terms of the nature and method of the study. Part of the theoretical information was collected through library studies, the use of documents, records and reports. To understand the scope, the studies conducted by the consultant as well as field observations and observations have been used. In the analysis section, using Analytic Hierarchy Process (AHP) and geospatial mappingmodel. In this study, at first, the criteria and the sub criteria for determining the location of the fire station were weighed by the Analytic Hierarchy Process (AHP) using Expert Choice software, and then, by digitizing the layers in the GIS, eachmap layer was produced for each of the criteria, and then the layers were overlapped by applying the weights of each layer, and the fire station's optimal locations are proposed. Results & Discussion Among the urban facilities, the construction of fire centers in the area due to the deployment of the old, historical and living Qaiseriyah market, and the lack of emergency exit routes and relief during the fire, as well as the existence of workshops and warehouses connected to the market, it is also important that it should be added to the consequences of other incidents. Therefore, this study was aimed at increasing the level of safety by locating fire stations in Isfahan's region 3using AHP and location model in GIS environment. After normalizing the maps with the Reclassifying tool, and according to the categories at this stage with the Raster Calculator tool, the sum of all generated layers multiplies the values for each layer obtained from AHP andmaps of the proposed locations for Fire station was created. Based on the final map (Figure 19), the most suitable optimal points for the fire station were selected based on the criteria analysis. These points of choice have the proper features, including proximity to access level 2, abandoned land, an area of 1500 square meters up, construction density and high population density in the periphery. According to (Fig. 19), three-point distances were investigated using the Euclidean Distance tool. On the other hand, according to the existing standard, for every 50,000 people we need to build a fire station; therefore, in addition to a fire station in the area, it is necessary to deploy another station. Finally, according to the aforementioned maps, by examining the intervals between the existing and proposed fire stations, the final map (Fig. 20) is based on the noninterference of the functional radii of 1200 meters of stations relative to each other; the third point was deployed as the optimal and the most common location of the firestation. Conclusion By studying the present situation and field observations of the fire stations in Isfahan's region 3, it has only one center, and according to the volume of utilizations and activities of importance in the region as well as theheight of the region with historic monuments at national and international levels, the issue of safety in the context of this region is very important. Therefore, based on the population and region level, the existing fire station does not cover the possibility of service within a 3-5 minute interval throughout the entire area. Considering that the area has organic and intact texture. Based on field observations and existing standards, residents need urban equipment, including fire stations. Therefore, the purpose of this study was to locate another fire station based on the region's requirements, standards and indicators. Therefore, effective measures in area 3 including demographic density, availability, consistent use, functional radius, building quality, size of parts, construction density, and user-friendliness were considered. Eventually, considering the 1200 meter radius, the location of the optimal fire station was proposed on Neshat Street.
Mohammad Zeinali; Ali Asghar Jaafarzadeh; Farzin Shahbazi; Shahin Oustan; Khalil Valizadeh Kamran
Abstract
Abstract
Soil salinity and salinization of lands as one of the problems facing agriculture, has paramount importance and should be avoided with proper knowledge of its progress. The first step in this way is to identify saline areas and prepare the salinity maps for these soils. With the development ...
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Abstract
Soil salinity and salinization of lands as one of the problems facing agriculture, has paramount importance and should be avoided with proper knowledge of its progress. The first step in this way is to identify saline areas and prepare the salinity maps for these soils. With the development of remote sensing technology and efficient use of satellite imaging, this research aimed to compare the prepared salinity maps with various types of image classification algorithms (Maximum probability, Minimum distance from the mean and Parallelepiped) by Landsat-5 satellite data with TM sensor in a part of the eastern lands of Khoy city. Therefore, 269 soil samples were analyzed with specific geographic coordinates and the results were plotted on TM image. For initial identification, topographic maps and ENVI 4.8 software were used to process satellite images and geometric corrections were made with specific points using GPS. Educational and experimental samples were located on the desired image with an appropriate distribution and salinity classes were determined from 1 to 9. Samples of each class of salinity due to having coordinates were placed accurately and with single pixel size in each image on the corresponding pixel and were stored with ROI format. The results indicate the existence of correlation between bands 1, 4, and 5 of TM image with salinity data, and the highest accuracy of the map among the classification algorithms in the Pixel-based method, is related to the maximum probability. In order to evaluate the accuracy, indices such as error matrix, Producer’s veracity, User’s authenticity, overall accuracy, and kappa Coefficient were extracted. Also, the correspondence of various salinity classes of this map with field observations and measured salinity level indicate the high accuracy of this algorithm in preparing a surface soil salinity map. The aim of the present study is to compare the prepared salinity maps with the results of other researchers by these methods in the area of interest.
abdolazim ghanghermeh; Gholamreza Roshan; smaeil shahkooeei
Abstract
Extended Abstract
Introduction
One of the practical indices in determining required energy for providing climatic comfort is the degree day index. The total mean deviation of daily temperature of human comfort temperature (threshold temperature) is called degree day temperature that provides many ...
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Extended Abstract
Introduction
One of the practical indices in determining required energy for providing climatic comfort is the degree day index. The total mean deviation of daily temperature of human comfort temperature (threshold temperature) is called degree day temperature that provides many applications in estimating required energy in cooling and heating section. It is notable that various studies around the world have used different temperatures to calculate HDD and CDD considering their climatic and geographical location. In Iran, 18 degrees centigrade is used for HDD and 24 degrees centigrade for CDD calculation, while climatic and geographical diversity of Iran causes new base temperatures to be recommended for HDD and CDD calculations. The present study plans to present a proper base temperature for calculating HDD and CDD with regard to specific characteristics of each city's climate.
Materials and Method
In the present study to determine the new threshold temperatures in order to provide the energy required for climatic comfort conditions, Olgyay diagram is used. Therefore, the average daily temperature and relative humidity data have been used to draw bioclimatic conditions. Since Iran has different climatic diversity, 10 stations that represent different climatic conditions of Iran were selected and analyzed (Figure 1). It should be mentioned that the duration of time series used includes the statistical period of 1950 to 2010 and these data was collected from Iran`s Meteorological Organization. Since hand drawing of each of the events on Olgyay diagram is cumbersome and time consuming considering the wide range of studied data, therefore, Olgyay diagram was digitalized to receive the output for each station quickly and easily. It is also noteworthy that in this study, Olgyay diagram is divided into 12 bioclimatic classes and the frequency of occurrence of each of the bioclimatic classes for each station in Table (1) has been reported. However, the most important section of this study is related to the determination of new base temperatures for calculating HDD and CDD indices of observational stations. Therefore, based on the days in the comfort zone, three regions in the form of percentile thresholds of 40 to 60 were selected as the representative of the central 20 percent of the data, percentile threshold of 25 to 75 percent as the representative of the dominant central 50% of the data, and finally percentile threshold of 10 to 90 as the central 80 % of the data were selected, and these domains were introduced as new thermal comfort for determining the base temperatures for HDD and CDD calculation (equation 1):
Equation 1:
In equation 1, LP is an equivalent for the threshold rank of the percentiles 10, 25, 40, 60, 75 and 90 percent, n is an equivalent for the number of samples and s is an equivalent for percentiles.
In the final step, after determining the base temperature, required cooling day-degree values (Equation 2) and heating (Equation 3) are calculated as follows:
Equation 2:
Equation 3:
In formula (2) and (3), cooling requirement is calculated by CDD and heating requirement is calculated by HDD for a given period of N days. In these formulae, T is the average daily temperature and è is the base temperature that with regard to the threshold of different percentiles, different numbers are proposed for each station.
Findings
Findings of this section showed that Shiraz and Esfahan have experienced the most ideal conditions of comfort with 35.22 and 33.22 percent of frequency of days in the comfort zone respectively and Babolsar with 83.2 percent of frequency has had the lowest percentage of days with thermal comfort. Among the observational stations, the most frequent occurrence experience of frost and freezing belongs to Sanandaj, and for the stations in Makoo, Shiraz, Tehran and Tabas, the most important preventive factor for the occurrence of comfort conditions is frost and freezing. But, Jask and Bushehr have had the most experience of the days with heat stroke risks and this factor is the most important preventive factor for comfort in these two stations. Although extreme dryness is the most important preventive factor for comfort in Ahvaz, but in Rasht and Babolsar, excess moisture is the most important factor of the lack of comfort. The results indicated that Olgyay diagram has perfectly shown the climatic and bioclimatic differences of various regions. For example, for the coastal cities of the Persian Gulf and Oman Sea, the type of data distribution on the diagram showed that climatic and bioclimatic characteristics of the two cities of Bushehr and Jask differ from Ahwaz, so that the dominant climatic regime of Bushehr and Jask due to the high humidity experience, are affected by the water zone of the Persian Gulf and Oman Sea, but Ahwaz is affected both by the water body of the Persian Gulf and hot and dry systems that pass directly through the Saudi Arabia.
Conclusion
Based on the main objective of this research, new thermal comfort thresholds for all study stations were proposed and the results showed that according to various percentiles, minimum base temperature for calculating HDD belonged to Babolsar station and maximum base temperature for calculating CDD belonged to Shiraz station. It is also worth noting that the sensitivity of the proposed method is such, that minimum differences in the domain and base temperature of thermal comfort are visible even for the stations located in a nearly similar geographical area, and this could indicate the validity of the proposed method. Finally, monthly and annual long-term average of HDD and CDD indices were calculated for the studied cities using proposed thresholds and base temperatures. The results of this section showed that in most observational stations, the months of January, December and February have had the maximum HDD requirements and the maximum CDD requirement was calculated for the months of July and August. The research findings reveal that maximum average annual HDD and CDD requirements belong to Makoo and Jask respectively. The results of this study point to the fact that the need for heating energy has been higher than the need for cooling energy for most of the studied cities. Therefore, the findings show that, based on the proposed method, which is derived from the climatic characteristics and experimental data of each station, a more logical thermal comfort thresholds for the studied stations are presented.
Seyyed Hojjat Mousavi; Abolfazl Ranjbar; Mehdi Haseli
Abstract
Due to the changesin land use that is done mostly by human activities, changedetection of landuse and assessment of their environmental impact isessential for future planning and managing the resources. Therefore, the aim of this research is monitoring, detecting andtrending the landuse changes in Abarkooh ...
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Due to the changesin land use that is done mostly by human activities, changedetection of landuse and assessment of their environmental impact isessential for future planning and managing the resources. Therefore, the aim of this research is monitoring, detecting andtrending the landuse changes in Abarkooh basin (1976-2014) in orderto assess the environmental issues such as human stress onearth without considering tolerance capacity, and to identify the regions havingenvironmental stress.In this regard, after classification to identify the type of land uses and applying the base component analysis and tasseled cap functions and difference of images, satellite images data from Landsat, MSS (1976), TM (1990), ETM + (2000 and 2006) and OLI (2014)) sensors, and remote sensing techniques such as supervisory classification and accuracy assessment have been used to monitor the land use changes. The classification results indicate the enhancing of seven typesof land uses including urban lands, agricultural lands, wastelands, rocky lands, rangelands, clayey plain anddesert, and which have the highest accuracy of classification in 2014with kappa coefficient values of82.18%and total accuracy of 0.76. The trending results of changes in land use indicate an upward trend of the area in rangelands (5.65%), rockylands (2.52%),wastelands (3.63%) and agricultural lands (1.04%), and a downward trendof the area in urban land (4.33%), clayey plain (6.89%) and desert (6.03%). From the perspective of base component analysisand tasseled cap functions, 1.748% (306.4912 km2) and 3.989% (699.961 KM2) of the area of the study region were faced with increasing changes of landuse, and in general, the overall trend of the changes of increasing classes is upward. Most of the changes in land use are destructive and devastating, and in terms of spatial changes correspond to the area around human community centers suchas Abarkooh and Mehrdasht cities. It is evident that,due to the continuationof this trend, the Abarkooh basinbecomes a dead inactive ecosystem that lacksany ecological and biological production potential in the near future.
Seyed Ali Alavi; Seyed Mostafa Hosseini; Fariba Bahrami; Mehrab Ashorlo
Abstract
Planning with the aim of crisis management and earthquake risk estimation has always been one of the main concerns of urban planners and managers. In order to plan crisis management before the occurrence of earthquake, determining the vulnerability rate of urban fabrics to earthquake is necessary. ...
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Planning with the aim of crisis management and earthquake risk estimation has always been one of the main concerns of urban planners and managers. In order to plan crisis management before the occurrence of earthquake, determining the vulnerability rate of urban fabrics to earthquake is necessary. This research was aimedat providing an appropriate model for assessing the vulnerability of urban fabrics of Semirom city,located in Isfahan province, to earthquake. The current research is descriptive-analytical in nature with practical aims. To begin with, the criteria affectingthe vulnerability of urban fabrics to earthquake were identified, and then the value and importance of each criterion was determined by using Analytic Network Process. Finally, the results obtained from Analytic Network Process, were integrated with main and side roads, population density, buildingsquality, land slope, distance from fault, green space, health centers, cultural centers, and educational and residential centers, and vulnerability map of Semirom’s urban fabrics to earthquake was prepared. The results showed that among the studied criteria, population density, side road and distance from the fault were the most important criteria, while distance from cultural and educational centers had the least importance in vulnerability of urban fabrics. Furthermore, vulnerability of the northern and central parts of the city was higher than other areas of the city due to their proximity to the fault line and the presence of old buildings in these parts. Based on the results obtained from digital layer of urban fabrics of Semirom city, losses and damages caused by the earthquake can be significantly reduced by proper planning before and after the occurrence of earthquake. It should also be noted that tectonic aspect is one of the factors that has always been neglected throughout the history; therefore paying attention to slope issue and other factors in urbanism has had evolutionary process.
Sharare Saidpour; Dyman kashefidust
Abstract
Extended Abstract Introduction Cities as the physical and human assets aggregation centers, will toll a lot at crisis time. So attending to passive defense matter can considerably decrease the damages. Passive defense is one of those matters that have become attended during recent years at urban plans ...
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Extended Abstract Introduction Cities as the physical and human assets aggregation centers, will toll a lot at crisis time. So attending to passive defense matter can considerably decrease the damages. Passive defense is one of those matters that have become attended during recent years at urban plans and schematizations. And one of the passive defense policies - in all countries generally and in Iran specially - is constructing urban shelters to protect citizens’ lives and decreasing human harms. Staying in shelters provides the ability of habitation and temporary people lives for one or two months and also provides preserving and modulating the activities, managing the environment, resistance and securing urban life. The city of Saqqez, as the center of Saqqez division at Kurdistan province, is subjected to present research which experiences many natural incidents as a mountainous city, of which, flood is the most important one. Generally further to geological status of this city, there exist several agents which increase the probability of crisis at Saqqez such as existence of loose earth, hillsides susceptible for sliding or stone staving, unobserving the construction rules and precepts, instability of the earth, lack of rebuilding of damaged zones, lack of suitable pathways, lack of fundamental studies and works for solving the inundation problem and repelling flood, missing the basic plans for encountering future tensions and hundreds of other problems which appear now in Saqqez city, so that if they continue and remain unsolved, they may lead to some hard knots and unsolvable problems and if such situations occurred, unless expending immense charges and hard trying of planners can’t improve the created situation. One of the most important tasks that appear after accident is temporary or semi-temporary habitation and consequently permanent habitation of survivors of accident. So present research have been codified with the main aim localization of urban shelters with passive defense approach and the minor aims specification and utilizing some criterions for selecting the best shelter for temporary habitation, helping the urban guardians and deciders in prioritizing latent locations and selecting the best location for making shelter. Materials & Methods This research is regarded among applied researches, and descriptive-analytical method is used for codifying it. Needed information is imitated through library, documents, fieldwork, statistical results and census tables. In this research based on available statics at detailed plan of Saqqez city and also a fieldwork at 2014, the ANP model at environment of Super Decision software has utilized for evaluating the criterions. Thereafter informative layers and proportionate maps with criterions was provided finally the combined map of criterions has been extracted which shows the best location for building shelter in this zone. Result & Discussion According to the performed studies, in order to answer the first question, the most effective criterions at localization of safe space of shelters: criterions of distance from clinic and infirmary centers, distance from fire stations, distance from open areas, distance from educational centers, distance from police stations and military centers, population accumulation, adaptability of urban land uses and accessing to communication network have been considered. In order to answer the second question, suitable locations for generating shelters at crisis times, are those points of city which have enough open areas and at the same time are compatible with surrounding land uses which have rather better potential for habitation of injured people. Those zones with incompatible and medley urban use and insufficient area have minimum possible ability for planning shelters. Thus central part has a high ability for habitation of injured people because of having proper open areas and also suitable accessibility. Conclusion Achieved results of this research show that by compilation of different layers of effective urban land uses, final map of optimized areas for generating urban shelters classified at five parcels from very good to very lean and 9 preferred locations have been considered which among them green areas, arid lands and schools have maximum scores for temporal habitation. Thus 3 parks in the city, 1 school and other open and arid lands have been preferred. According to performed analysis and results, designation of equipment and necessary services at selected locations for temporary habitation specially parks and gardens such as specifying heliport, toilets, water sources, etc. are obligatory then it is not necessary to spend time for providing them during any misadventure in order to not any tribulation retards the fast relief process. Constructing the wide open spaces such as parks, gardens, sport fields, etc. with at least 2000 square meter area inside the neighboring units simultaneously with performing other constructional works among these areas are useful and effective to fast evacuation of injured people to this areas and establishing the temporal houses. Informing and introducing safe places for people habitation is necessary and all governmental and private places, gardens, military places, stadiums and sport fields, bureaus and agencies, relief centers, etc. which have suitable spaces among the city or around it, by respecting protection and safety principles can use their spaces multipurpose and contribute in this matter.
yousef ebadi; Javad Javdan; Mohammad Hossein Rezaei Moghaddam
Abstract
Extended Abstract Introduction Groundwater, its quantitative/qualitative variables, and variability directly affect human life, and thus has always been one of the major topics in scientific and academic research. Due to geographical, climatic and hydrological conditions, and specific patterns of surface ...
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Extended Abstract Introduction Groundwater, its quantitative/qualitative variables, and variability directly affect human life, and thus has always been one of the major topics in scientific and academic research. Due to geographical, climatic and hydrological conditions, and specific patterns of surface water and subsurface water resources exploitation, this country has always faced water scarcity. As a result of global and regional changes in temporal and spatial patterns of rainfall, this has intensified in recent years. Therefore, exploitation of groundwater resources has been considered as an option for supplying agricultural, industrial and drinking water. However, excessive exploitation of these resources will result in their destruction. In recent years, excessive removal of groundwater and reduction of groundwater levels have resulted in some problems like subsidence in some plains. This makes it necessary to study the quantitative and qualitative changes of these resources more clearly. Due to the complex nature of aquifers’ hydrogeological systems, accurate investigation of these resources seems costly and even impossible. Thus in order to achieve a better understanding, it is necessary to use different methods for estimation and evaluation of such variables. Material & Methods Most environmental features are completely continuous in nature, which makes it impossible to measure these features in every part of these environments. Thus, we can generalize measured samples to other areas lacking accurate measurements, and in this way estimate these variables in unmeasured areas. This is also true about quantitative and qualitative variables of groundwater, i.e. by collecting samples from some sections, we can measure different characteristics in these samples. This surface modelling -or in other words, generalization of points to surface- can be achieved with mathematical and statistical relationships and rules. Due to the spatial structure of the measured specimens, geo statistics is used in this regard. In recent years, artificial intelligence models, inspired by the natural nervous system and simulating its function, have yielded a very satisfactory result in groundwater estimation and studies. In order to evaluate the accuracy of geo statistical methods and artificial neural networks, the present study takes advantage of statistics and measurements collected from groundwater level of 46 wells in Shabestar-Sufiyan plain in 2014. Kriging method (geo statistics) and multilayer perceptron neural network method (MLP) were used along with error propagation pattern (BP) to estimate unmeasured features in the study area. MATLAB 2016B was used to perform the neural network modeling and ARCGIS10.5 was used to perform Kriging method and prepare the final maps. In both neural network and kriging models, geographical coordinates of observed wells was used as input and measured water table was introduced as the study goal. Primary data reduces the accuracy of models. Thus, data was normalized before being introduced to the neural network model. After the initial analysis of data dispersion and normalization, logarithmic transfer function was used due to the relative improvement of data in Kriging estimator model. Results & Discussion Results indicate that at the training and testing stage (with Sigmoid tangent activation function (Tansig) and 9 neurons in the middle layer), neural network method (MLP) with a high correlation coefficient (0.96) and root mean square error of 13.18 is more accurate than Kriging method with J-shaped Variogram model, a correlation coefficient of 0.90 and root mean square error of 20.10. Due to realistic results provided by neural network method, it is considered to be a more efficient method in estimation of water table in Shabestar-Sufiyan Plain. This is also consistent with earlier hydrogeological studies (regarding aquifers) performed on the ability and flexibility of Artificial Intelligence models. Conclusion Results obtained from the current research, and previous studies conducted in this field indicate that most artificial intelligence computing models are capable of evaluating and estimating continuous environmental variables. On the other hand, understanding groundwater resources’ conditions is considered to be crucial. Thus, new methods, such as artificial neural networks (ANN) and adaptive neuro-fuzzy inference methods (ANFIS) and fuzzy inference systems (FIS), which provide greater accuracy can help decision makers and researchers in maintenance and improvement of the groundwater status.
Vahid Sadeghi; Hamid Enayati; Hamid Ebadi
Abstract
Analyzing multi-temporal remotelysensed images is an effective technique for detecting land useand land cover changes in urban areas. Apart from thetechnique used to detect the changes, the features space has an enormous impact on the accuracy of the results. Achieving satisfactory results in detecting ...
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Analyzing multi-temporal remotelysensed images is an effective technique for detecting land useand land cover changes in urban areas. Apart from thetechnique used to detect the changes, the features space has an enormous impact on the accuracy of the results. Achieving satisfactory results in detecting changes inurban areasrequires the use of optimal spectral and spatial features (texture). Although global search is the only guarantees of achieving the optimal set of features, but it is a very timely and impractical process in practice. Data reduction techniquessuch as PCA considers the independence of the data tofind a smaller set of variables with less redundancy withoutintending to improve the CD accuracy. Difficulty in setting thebest threshold for JM distance in Separability Analysis Algorithm (SAA)reduces its efficiency. The main purpose of this paper is to select the optimaltextural and spectral features to enhance the CD accuracy usinggenetic algorithms (GA) and Bayesian classifier. To investigate the effectivenessof the proposed tecknique, a case study using IRS-P6and GeoEye1 satellite imagery taken from Sahand New Town (Northwest ofIran on July 15, 2006, andSeptember 1, 2013) was performed. All of the aforementioned methods of feature selection (PCA, SAA and proposed GA-based method) were implemented in MATLABR2013a. The results show that, textural features provides a complementary sourceof data for CD in urban areas. The results show thatfeature selection is an effective process fordetecting changes basedon textural and spectral features. Each of the techniques for selecting features has its own limitations and advantages, but in general, improve the CD accuracy. The proposed GA-based feature selectionapproach was found to be relatively effective when compared withPCA and SSA approaches. Overall accuracy and Kappa coefficient ofCD were increased from 53.66% to 88.49% and 58.94% to90.39%respectivelyusing proposed methods compared tothe use of spectral information.
Hamid Ebrahimy; Aliakbar Rasuly; Ahmad Ahmadpour
Abstract
Extended Abstract
Introduction
Land use is one of the most important indicators of economic and social development in urban areas, and has resulted in extensive changes in available structures and procedures of these areas. Therefore, human activities are known as one of the main principles and components ...
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Extended Abstract
Introduction
Land use is one of the most important indicators of economic and social development in urban areas, and has resulted in extensive changes in available structures and procedures of these areas. Therefore, human activities are known as one of the main principles and components of change in land use. Generally, land use changes are inevitable product of interactions between human activities and environmental elements. Remote sensing technology with capabilities such as providing update and reliable information about natural and urban areas, digital processing of satellite imageries, providing the possibility of temporal and spatial comparing of different phenomena, diversity of products, and etc. is considered to be a powerful tool in improving the efficiency of urban management. Consequently, remote sensing data are used to determine type, quantity and location of land use changes. Moreover, remote sensing technology is used extensively in land use maps all over the world. Many models have been applied to predict land use changes, which due to the complex, dynamic, and non-linear nature of the issue gained little attention. However, CA-Markov model, which is a combination of Markov chain and cellular automata, is commonly considered to be an appropriate and good method for spatial-temporal modelling of land use changes. In the present study, land use changes were investigated for a 15-year period in Shiraz using object- based image analysis. Then, a land use map was produced using cellular automata-Markov (CA-Markov) model to predict land use changes in the study area in 2020.
Material & Methods
The present study includes two main phases. In the first phase, land use map of Shiraz was produced using Fuzzy object based analysis of satellite imageries. In the second phase, modeling and predicting of land use changes in 2020 were performed. Landsat imageries of the study area in 2005, 2010 & 2015 were used in this research. After preprocessing and preparing the imageries, segmentation procedure was performed as the first stage of object based classification using multiresolution segmentation algorithm. The nearest neighbor algorithm was used for object based classification of satellite imageries. Classification conditions were defined in accordance with each class properties, and classification was performed based on fuzzy operators of the classification operation. In CA-Markov model, the possibility of changing from one class of land use to another was calculated using transfer matrix table. Then, land use map of future years will be predictable in accordance with the transfer probability matrix, and desired time interval.
Result & Discussion
In this study, scale parameter of 10, shape index of 0.4, and compactness index of 0.2 were extracted as the optimum conditions for segmentation. Apart from spectral data, information regarding the location, context, texture, normalized difference vegetation index, enhanced vegetation index, and digital elevation model were also used to improve the efficiency of classification phase. The results of model validation shows an overall accuracy of 89% and kappa coefficient of 0.87. Therefore, the results of CA-Markov model shows a very good potential for predicting land use changes in Shiraz. Thus with the adjustment and calibration of model parameters and based on land use maps of 2010 and 2015, Shiraz land use in 2020 was predicted.
Conclusion
Due to the complexity of modeling dynamic changes in urban land use, utilizing efficient and update methods of data analysis is crucial. Therefore, satellite imageries and object based image analysis techniques were used to prepare land use map of Shiraz based on the data collected over a 15 year period. By considering the defined land use classes (residential area, barren lands, street network and urban green space), optimum image segmentation parameters were found. Then, classification conditions were defined for each class using the nearest neighbor algorithm and fuzzy operators. In this way, image classification was performed. By analyzing land use changes during the 20-year period, we understand that residential area has increased from 38 square kilometers in 2005 to 142 square kilometer in 2020. Additionally, green space area faced a reduction of 4 km in the first 5 years of the period, while in the next 15 years green space area shows an increasing trend.
Saeed Amanpour; Mohammad Javad Kamelifar; Hojjat Bahmani
Abstract
Abstract[1]
One of the main challenges in the urban development process in developing countries is their accelerated growth, which, if this growth issporadic and unplanned,it will pose a lot of problems to the urban management process and planning.The city of Ahwaz is one of the cities in our country ...
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Abstract[1]
One of the main challenges in the urban development process in developing countries is their accelerated growth, which, if this growth issporadic and unplanned,it will pose a lot of problems to the urban management process and planning.The city of Ahwaz is one of the cities in our country that has witnessed arapid and scattered growth in urban land development in recent years. According to the status map of the urban land development, this trend has been intensifying year by year and has led to challenges in providing services and infrastructural resources in the city. In this regard, due to the necessity of the issue, in the present study, we tried to use a descriptive-analytical method to evaluate land use changes in the metropolis of Ahwaz between 1989 and 2013. Data collection in descriptive section was done through the study of library documents, and in the analytical part of the research, by extraction of satellite images TM (Thematic Mapper) for the years of 1985 and 2013 from Ahwaz city. Envi 4.8 and Arc GIS 10.2 software have been used to perform statistical and visual analyzes on satellite imagery. The results show that during the years 1989 to 2013 about 23 percent of the share of barren and agricultural lands have decreased and on the other side the share of built-up lands has increasedfrom 16.35 to 34.55, most of which are related to the Southern and Eastern parts of Ahwaz (Parts of areas 4, 5 and 6 of the municipality).
[1] - به دلیل کیفیت نامناسب متن چکیده مبسوط انگلیسیِ ارائه شده توسط نویسنده مسئول مقاله، نشریه به ناچار اقدام به ترجمه مجدد متن چکیده فارسی و انتشار آن به جای چکیده مبسوط انگلیسی نموده است.
Hasanali Faraji Sabokbar; Seyyed Hasan Motiee Langroodi; Hossein Nasiri
Abstract
Abstract
With the development of science and technology, a large amount of spatial and non-spatial data are stored on large databases. Analyzing these data for decision making necessitates the need for spatial data mining to discover knowledge. The use of satellite imagery, geo-statistical analysis, ...
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Abstract
With the development of science and technology, a large amount of spatial and non-spatial data are stored on large databases. Analyzing these data for decision making necessitates the need for spatial data mining to discover knowledge. The use of satellite imagery, geo-statistical analysis, and all types of spatial data are useful and practical tools in studying land use change monitoring; but, what is important is the extraction of precise rules by integrating large amounts of data in order to provider knowledge about the area of interest. Rough Set Theory (RST) is one of the data mining techniques used in various ways in modeling uncertainty in data. Therefore, in this research, the RST knowledge discovery method is used to extract rules in combination with decision tree algorithm (DT) for satellite image classification and monitoring of land use changes. The results of the research indicate that according to the changes occurred during three periods of (1986-1998, 1998-2014 and 1986-2014), it can be seen that significant increasing and decreasing changes have occurred in the constructed lands and in the water bodies, while agricultural lands have not changed much. Of course, considering the base year (1986), it can be stated that the area of the agricultural lands under cultivation has witnessed a slight change compared to the base year which coincided with the imposed war, which means that the area under cultivation during the past three decades has been the same as that of the war period. This indicates that, the crisis is taking place in the agricultural sector. Also, in terms of methodology, given the overall accuracy and Kappa ratio, derived from the DT-RST combination model, RST can be considered to be a powerful tool in data mining, reducing the redundant data from databases and extracting rules for use in the DT method.
Amir Mahdi Emamizadeh Mahabadi; Kamran Lari; Mojtaba Zoljoodi
Abstract
Extended Abstract Sedimentation in ports’ access channels is a major problem for the port authorities as well as the vessels navigating in these channels. This phenomenon creates dangers for the ships in this vital part of the port in addition to imposing heavy costs on the port. In this research, ...
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Extended Abstract Sedimentation in ports’ access channels is a major problem for the port authorities as well as the vessels navigating in these channels. This phenomenon creates dangers for the ships in this vital part of the port in addition to imposing heavy costs on the port. In this research, we evaluated and estimated the sedimentation rate and volume in Imam Khomeini port’s access channel based on field information as the research goal. In this research method, analyses on the geographic status such as bed level, analysis of wave time series and tide (as current) were carried out in the region by Mike 21 software, and appropriate modeling was presented. To investigate the rate and volume of sedimentation, the methods of hydrography, Bijker’s theory and modeling by Mike 21 were used. In the present study, hydrodynamic model of current and sediment transport will be carried out using valid engineering methods. At the same time, all information and library data and the results of existing field data are collected and analyzed, and the results obtained from different methods (Hydrography, Bijker and Mike 21) are calibrated. In line with the objectives of the study, the following cases can be summarized as: - Collecting required data and statistics such as wind, wave, current, sediment characteristics of the region or grading, and sounding data. - Investigating the variety of dredging methods and equipment available in the world. - Examining different types of discharge methods, and diverse applications of the extracted sediment. - Computations and modeling. - Summing up and conclusion and analyzing the results. The hydrographic boat moves on specific paths according to a predetermined schedule in order to estimate the depth or carry out the sounding. The boat is equipped with a dual or multi-frequency GPS device and a sonar device. The boat receives its horizontal position from the GPS. The sonar sends an audio wave to the bed during the movement, and gives the depth for each point by calculating the wave’s round-trip time and the sound velocity profile, and on the other hand, the GPS provides the horizontal position of that point. Today, various software are capable of simultaneous recording of this information, which is used in hydrographic vessel. Based on the obtained results and investigating the hydrographic maps, the actual amount of sedimentation in the channel (0/000078m^3/s/m) was obtained. Given that, the criterion hydrographic method was taken into consideration for the work and calculations in other ways, the error percentage of the results obtained from Bijker’s and modeling of Mike’s calculations were 12% and 20% respectively. Accordingly, the dimensionless coefficients of á=0.88 and =1/2 were obtained for Bijker’s theory and the results of the calculations by Mike21 respectively, which indicates good accuracy. Based on the results, the optimal method of dredging and the morphological changes of the region can be achieved based on the obtained models. Considering the sediment granularity diameter D_50=6ìm, it can be concluded that the most suitable method for dredging with regard to available facilities in the port is the use of self-propelled hopper suction dredger. However, if the dredging unit is equipped with new equipment such as bed leveler device, more optimal methods can be obtained. By this method, the total volume of sediment was 244466.280 cubic meters for an area of 57213810.4 square meters. Of course, this was the volume of solid materials, and according to the experts of the Ports Organization, this amount is 20% of the total volume of the total sediment (solids and water). It can be concluded by a simple calculation that the sedimentation rate in a one year period is about 13.7 cm per square meter per year, which shows a good approximation compared with the field measurements conducted by the Ports and Maritime Organization with a value of 13.5 cm per year. Bijker (1971) presented a method for calculating sediment transport in a combined state of wave and current. This method was expanded to calculate the sediment transport of the coastline. Bijker modified the Fryjling-Kalinske formula for the bed sedimentation along with the Einstein method to evaluate sediment transport applied in coastal environment. For this reason, the Bijker formula is very popular among the European engineers. Among the world’s leading mathematical models in analyzing the phenomena governing the sea environment, Mike21’s mathematical model is one of the most well-known ones. This advanced software has been founded, completed and developed by the Hydraulic Institute of Denmark over time and in collaboration with the Water Quality Institute of this country. This software is a comprehensive system for modeling two-dimensional free flows in which fluid flow layering cannot be ignored.
Shahab Sherafati; Manuchehr Masumi
Volume 21, Issue 84 , February 2013, , Pages 145-156
Abstract
Lots of parameters like growing of plants, trees falling across power line, land sliding and flood may lead to massive damage of power line corridors. Therefore, several methods have been used for monitoring and inspecting power lines including field surveying, aerial image analysis and LIDAR analysis ...
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Lots of parameters like growing of plants, trees falling across power line, land sliding and flood may lead to massive damage of power line corridors. Therefore, several methods have been used for monitoring and inspecting power lines including field surveying, aerial image analysis and LIDAR analysis which are very time consuming and expensive. Implimantation of satellite images and remote sensing technology may be an alternative method. But this new method too, may have some limitations in analyzing small features. In this paper, the main objective is to discuss satellite images capabilities in automatic pylon extraction and finding power lines. For this purpose, IRS-P5 satellite images have been used as the main data. This sensor provides panchromatic images with spatial resolution of 2.5 meter. In contrast with some high spatial resolution sensors like WorldviewII and GeoEyeI that provides multispectral images with better spatial and spectral resolution (about 1.6m in multispectral bands and 0.5m in panchromatic band), it is more troublesome to extract pylons in P5 images. Indeed, these sensors can show a pylon and its shadow like two separate triangles, but in P5 images pylons are like dark speckels. Therefore, in this paper several conditions have been used to distinguish pylons and power lines correctly. Results show that the proposed method can satisfactorily extract pylons in homogeneous areas, but in rough regins that have lots of small dark speckles (like vegetation areas), the accuracy decreases. As the second objective of this paper, the capability of satellite images in measuring pylons’ height has been discussed. P5 stereo images can not find the height of the pylons, but sensors with higher spatial resolution, like Worldview I, have this capability. Although, even in this sensors, reaching stereo images matching pylons’ pixel may be a challenging task.
Yones Gholami Bimargh; Sayed Ahmad Hosseini; Mohsen Shaterian; Akram Mohammadi; Abolfazl Dehghan jazi
Abstract
Introduction
Nowadays, rapid urbanization; mismatch between modern streets and the demands of population; population attracting land uses along streets; and vicinity of incompatible land uses have resulted in traffic congestion in cities. Traffic is one of the major problems in most large cities, and ...
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Introduction
Nowadays, rapid urbanization; mismatch between modern streets and the demands of population; population attracting land uses along streets; and vicinity of incompatible land uses have resulted in traffic congestion in cities. Traffic is one of the major problems in most large cities, and even medium and small cities. It is also one of the social problems of modern societies and cities. Although, extensive studies have been carried out on the network structure and land use separately, their interaction has been disregarded. Like other modern cities, the city of Kashan faces this problem. The central texture of Kashan attracts a large population throughout the day, and especially during rush hours. This is on the one hand, due to the presence of historical elements, such as Kashan historical bazaar, historical buildings and schools, and on the other hand, because of population attracting land uses like commercial, educational, and therapeutic land use. Therefore, it is necessary to consider this problem, and the spatial redistribution of population attracting land uses.
Materials & Methods
The present study applies a descriptive-analytic methodology. The necessary information was collected using library research, documentary method, and expert interview. Then, the data was entered in GIS software. GIS software and network analysis model were used for data analysis.
Results & Discussion
In this study, the role of educational and therapeutic land use in traffic congestion in central areas of Kashan was investigated. To carry out network analysis, the network map of Kashan streets and their operating speed were required. The street network was depicted in GIS software. Then, the maximum operating speed of the main streets of Kashan was determined based on the master plan. Table 1 presents operating speed in five main axes of Kashan based on the master plan. These include main and crowded streets of Kashan. The operating speed of other streets was collected through expert interviews. After designing the network and determining operating speed of streets, (educational and therapeutic) land uses with the most significant impact on the traffic congestion of Kashan were identified by interviewing ten experts, with the aim of determining service areas. For each sample land use, a test was performed to determine service areas in the network analysis phase. To conduct this test, the standard service radius of educational and sanitation land uses in Iran was used. In network analysis, the test was separately conducted for each primary school (minimum operating radius of 4 minutes/ maximum operating radius of 5 minutes), middle school (minimum access radius of 6 minutes/ maximum access radius of 7 minutes), high school (minimum access radius of 8 minutes/maximum access radius of 10 minutes), and therapeutic land uses (minimum access radius of 7 minutes/ maximum access radius of 8 minutes).
Conclusion
Based on the analysis of service provision range in Kashan downtown, we conclude that compared to other areas in the city, primary schools (in their minimum access radius) face 2.25% increase in traffic congestion; middle schools in their minimum radius of access face 4.67%, increase and in their maximum radius of access face 1.83% increase; high schools in their minimum radius of access face 3.25% increase, and in their maximum radius of access face 7.95% increase, and therapeutic land use in their minimum radius face 7.46% increase, and in their maximum radius face 6.16 % increase in traffic congestion. However, primary schools in other areas of the city face 0.24% higher traffic congestion in maximum access radius as compared to downtown. Thus, downtown attracts 13.13% more unnecessary urban commutes and traffic in its minimum radius of access. This reaches 20.68% in the maximum radius of access, which is due to a larger overlap between educational and therapeutic land use.
Hamidreza Dastranj; Farrokh Tavakoli; Ali Soltanpour
Abstract
Extended abstract
Introduction
We live in a world where water has always been considered as one of the major issues. Currently, many people in developing countries are deprived of sufficient water to meet their basic needs. Lake Urmia is located between the longitudes45 to 46 ° East and latitudes ...
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Extended abstract
Introduction
We live in a world where water has always been considered as one of the major issues. Currently, many people in developing countries are deprived of sufficient water to meet their basic needs. Lake Urmia is located between the longitudes45 to 46 ° East and latitudes 37 ° to 38.5 North. The lake is located in Zone 38 of theUniversal Transverse Mercator System (UTM). Lake Urmia is the largest inland lake in Iran and the second largest saltwater lake in the world. The desiccation or drying upcrisis of Lake Urmia with an area of about half a million hectares consideringits consequences has led to actions and plans by organizations, agencies and even people which still continues and has become a national issue. Investigating the changes in the water level and the volume of lakes in order to protect them, has acquired a special place among the countries both in national and regional levels during the recent years.Generally, there are two methods forthe collection of information from the objects and phenomena on the surface of the earth:one island methods (land access) and the other is remote sensing methods.
Materials & Methods
In this regard,due to the importance of the issue, exploitation of satellite images and satellite altimetry observationsto study the water level and volume variations of Lake Urmia is the reason for the present research.In this research, Landsat satellite imagery in a 40 year period from 1976 to 2016 was used. Lake Urmia is located in 2 frames in some of these images and in 3 frames in some, and using them, the coastline map and the area of the Lake and its changes were obtained. To do this, ENVI software was used to perform the processing steps required to extract thecoastline changes, and ArcGIS software to perform cartography for the obtained outputs.After selecting the appropriate technique for implementation in order to analyze the extraction of the coastline changes, the steps can be expressed as the following:Selecting educational samples on the images, applying neural network classification method, evaluatingclassification accuracy, extracting coastline changes.
Results & Discussion
After the classification is donewith the desired algorithm and the classification accuracy is verified, thedata output is divided into two main water and non-water applications. And then, as the boundary between the land and water is determined, the coastline can be extracted.In this research, three indexes of error matrix, overall classification accuracy and Kappa coefficient were used to assess the accuracy of the classification.It should be noted that in the selection of the water areas, three deep, medium depth and shallow water sections were taken into consideration and the choice of these areas in the infrared band which is particularly for the distinction between water and non-water was used.And finally, the accuracy of the classificationswas evaluated. Also, using Envisat and Saral altimeter satellite data,both of which have two passes over Lake Urmia, we obtained the water level of the lake in 2002-2015. For this purpose, we first processed the data,using the BRAT software, and obtained the balance level by applying the corrections related to the measurements of the satellite range and elevation in the MATLAB software. Now, using the amount of the lake surface area and its level in different years, we obtained calculated the volume changes and finally, the obtained resultswere compared with the results drawn from the land data which corresponded to the answers. In this research, the information of the area including runoffs flowing into Lake Urmia, we have also studied runoff flowing into the Lake Urmia region, surface and groundwaterwithdrawal, climate changes, changes in groundwater levels, investigation the volume changes in groundwater aquifersand...were studied as well.
Conclusion
The results indicate that the area of Lake Urmiahas decreased from 5366 square kilometers in 1976 to 633 square kilometers in 2015, about one-eighth, and then with an increase has reached to 2383 square kilometersin 2016. The level of the lake water has decreased by 4 meters from 2002 to 2015 and has increased by 0.5 meters in 2016. The volume of water in Lake Urmia has decreased by 9.7 billion cubic meters from 2002 to 2015 and 1.2 billion cubic meters were added to it in the following year. The results also show that the largest reduction in the volume of the lake water has occurred in 2007-2012. The water inflow into the lake in 2014-15 comparing to 1995-96 has beenapproximately one fifth and has decreased to 700million cubic meters from 3,500 million cubic meters,And in fact the inflow water has decreased 2800 million cubic meters while, the groundwater withdrawal has increased by 360 million cubic meters in this period, which indicates an imbalance in the amount of inflow water and groundwater withdrawal. According to the results obtained, the main reason for reduction of the lake water is the withdrawal of surface and ground water. Therefore, avoiding uncontrolled water withdrawal, shutting down the unauthorized wells, opening the floodgates of dams as needed, to avoid the construction of other dams in the basin of the LakeUrmia, dredging of the rivers leading to the lake, as well as the reforming the agricultural methods and types of products are essential.
Reza Sarli; Gholamreza Roshan; Stefan Grab
Abstract
Extended Abstract Introduction change monitoring is generally used to evaluate natural processes such as the long-term effects of climate change, which is affected by the interaction of the climatic system’s constructive components such as the biosphere, lithosphere, or factors that control the ...
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Extended Abstract Introduction change monitoring is generally used to evaluate natural processes such as the long-term effects of climate change, which is affected by the interaction of the climatic system’s constructive components such as the biosphere, lithosphere, or factors that control the climate changes outside the climatic system, over a long period of time, as well as the short-term processes that include vegetation sequence and geomorphological processes. Change monitoring is also used to evaluate the effects derived from human activities such as deforestation, agriculture and urban development. Remote sensing is a very useful technology, which can be used to obtain information layers from the soil and vegetation. Materials and Methods Land Cover Product was used to process the MODIS1 Satellite data which is one of the most frequently used products designed relating to MODIS Satellite, and is used annually. This Sensor with 250-500 meter and also 1-kilometer spatial resolution has 36 spectral bands in the range of visible, reflectional infrared and thermal infrared wavelengths, which can well be used for various applications of the surface, the Earth surface, atmosphere and the oceans. MOD12Q1, which is one of the MODIS products, was used to investigate and analyze the profile of the vegetation changes in Mazandaran province using the NDVI and EVI indicators from 2005 to 2017. The related images have been prepared annually with 500-meter resolution and sine coordinate system in the form of a combination of Terra and Aqua data. Given the standards provided by NASA, the changes were investigated using the “decision tree” classification method, and the map for the prediction of its changes was calculated using the Markov Chain Model. The ArcGis software was then used to analyze these changes in order to determine which use of land with what percentage of changes has been allocated to which area. Results and Discussion In 2005, land-uses associated with dense vegetation dominated an area of 398.77 m2. These land-uses include wasteland, dense vegetation and scattered vegetation. The estimation of the changes occurring in the aforementioned land-uses showed that the maximum changes relating to the low density vegetation with an average of 55.62% are in the northwestern and the eastern parts, and the minimum changes relating to the in dense vegetation with an average of 77.21% are in the central parts of the region, respectively. Furthermore, the observations of the images of the year 2005 show that the use of dense vegetation which has turned into low density vegetation in the image of the year 2017, has had the minimum changes. Finally, considering the prediction of the observed changes, it can be concluded that these changes were more related to the altitude range of 1400 m to 2260 m with the slope coefficients of 15% to 99%. The prediction carried out using the Markov Chain also suggests that the low-density land cover, which was over 864/80 km2 in 2017, will turn into barren lands in proportion to the changes occurringin 2022. Conclusion A major part of the vegetation changes in the area is due tothelack of job opportunities, extra labor attraction and the economic poverty of the inhabitants.In addition,the pressure on the meadow fields hasreached its highest limit by ranchers,which has resulted inthe reduction of grasslands. Eventually, it could be stated that the evaluationmethods and modelsof the vegetation changes have their own featuresand no method on its own is usable andappropriate for all cases, hence,the identification of an appropriate method for evaluating thevegetation changesneeds to be examined quantitatively and qualitativelyin order to provide the best result.
Geographic Information System (GIS)
Mohammad hassan Yazdani; Ata GhaffariGilande; Farahnaz Veismoradi
Abstract
Extended Abstract1-IntroductionA crisis is a crisis that threatens our country due to special geographical conditions. According to official statistics in the last 29 years, 1% of the country's human casualties were caused by earthquakes, and on average every year an earthquake with a magnitude of 7 ...
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Extended Abstract1-IntroductionA crisis is a crisis that threatens our country due to special geographical conditions. According to official statistics in the last 29 years, 1% of the country's human casualties were caused by earthquakes, and on average every year an earthquake with a magnitude of 7 on the Richter scale occurs in the country for 11 years (Attar), 2012: 8).From the point of view of geology, Iran has a zone of lithological structure such as Central Iran, Zagros, Northeastern Iran, Northwestern Iran and Azerbaijan zone, which the thrust and elevated structure of Zagros is considered as one of the most active of these zones. It includes faults such as Sahne, Durood, Qala Hatem. The seismic characteristics of Zagros show that compared to other structural zones, the frequency of earthquakes is high. The central Iranian and Arabian plates are constantly pressing on the Zagros region, and this is the reason why more earthquakes occur in Zagros than in other regions. The studied area of Kermanshah region is an earthquake zone in terms of seismicity. This province, which is located in the Zagros region, has high seismic activity. These earthquakes usually occur around known seismic faults in the province, including the High Zagros Fault (High Zagros Fault, 2014: 114). Despite numerous researches in the field of locating temporary accommodation on the subject of seismic vulnerability, its suitable and usable place after the earthquake with the approach of crisis management in urban areas has received less attention. The city of Kermanshah is a prone region in terms of earthquakes, and due to its location in a geographical area with a high risk of earthquakes, knowing the vulnerable and resistant areas and planning for the correct and appropriate location of temporary accommodation in time The occurrence of an earthquake is necessary to prevent or reduce the possible danger in this city. This research is complementary to the previous research and with more effective criteria and indicators by providing a practical, efficient, simple and logical method for locating temporary accommodation in order to prepare the city with their specific complexity in responding to crises caused by earthquakes. Is. As an example, the Ezgele earthquake in Kermanshah in 2016 with a magnitude of 3.7 on the Richter scale occurred 11 km from Ezgele section and 32 km from Sarpol-Zahab city, which killed and injured more than 12 thousand people. And since then, due to the lack of single policies in the field of emergency, temporary and permanent housing, problems have been created for housing people. Therefore, the existence of a suitable place to live in Sharat after natural hazards, especially earthquakes, is essential for the city of Kermanshah. The present study, taking into account the stages of crisis management of an earthquake-prone city, tries to address the problem of locating suitable spaces for the construction of temporary accommodation camps.2-MethodologyThis research is of an applied type and according to the investigated components, the approach that governs it is the descriptive-analytical method. The aim of the present research is to analyze the important and influential criteria for the correct location of temporary accommodation in Kermanshah city. In order to achieve this goal, in accordance with the objectives of the research, the required information has been collected using library research, documents and interviews with experts, and then the criteria used for positioning have been selected based on the positioning criteria. The current approach to spatial analysis has been carried out by using the weighted sum model and the ranking method and ArcGIS software.3-Results-Road situation: The analysis of the results of the Kermanshah city situation based on the road access index using GIS analysis software shows that 75% of the city is in the very low vulnerability zone, 7% is in the low vulnerability zone, and 5% is in the vulnerability zone. On average, 3% is in the high vulnerability zone and 10% is in the very high vulnerability zone.-Population density: Examining the results of the state of Kermanshah city based on the population density index using GIS analysis-mapping software, shows that 27% of the city is in the very low vulnerability zone, 27% in the low vulnerability zone, 26% in the medium vulnerability zone. 11% is in the high vulnerability zone and 10% is in the very high vulnerability zone.-Location to administrative, law enforcement and military centers: Examining the results of Kermanshah city status based on the index of access to administrative, law enforcement and military centers using GIS software, shows that 7% of the city area is in the very low vulnerability zone, 12% in the vulnerability zone low, 13% in the medium vulnerability zone, 12% in the high vulnerability zone and 57% in the very high vulnerability zone.-The location of fire stations: the analysis of the results of Kermanshah city based on the index of access to fire stations using GIS analysis software shows that 2 percent of the city is in the very low vulnerability zone, 5 percent in the low vulnerability zone, 8 percent in In the medium vulnerability zone, 32% is in the high vulnerability zone and 53% is in the very high vulnerability zone.-Land slope: This criterion is measured by the slope index. Examining the results of Kermanshah city status based on the land slope index using GIS analytical-mapping software, shows that 46% of the city area is in the very low vulnerability zone, 33% in the low vulnerability zone, 11% in the medium vulnerability zone, 6% in the vulnerability zone. high and 4% is in the zone of very high vulnerability.-Distance from flood-prone areas: The evaluation of the results of Kermanshah city status based on the index of distance from flood-prone areas using GIS analysis-mapping software shows that 16% of the city area is in the very low vulnerability zone, 11% in the low vulnerability zone, 19% in the low vulnerability zone. In the zone of moderate vulnerability, 25% is in the zone of high vulnerability and 29% is in the zone of very high vulnerability.-Distance from hazardous facilities: To measure this criterion, the indicators of electrical facilities, gasoline pumps, gas pumps and gas pressure reduction stations have been used in terms of their functional nature and hazard. Analyzing the results of the state of Kermanshah city based on the index of distance from dangerous facilities using GIS analytical-mapping software, it shows that 13% of the city area is in the very low vulnerability zone, 12% in the low vulnerability zone, 25% in the medium vulnerability zone. 34% is in the zone of high vulnerability and 16% is in the zone of very high vulnerability.-Status of water sources: The results of Kermanshah city situation based on the index of access to water resources using GIS analysis-mapping software show that 9% of the city is in the very low vulnerability zone, 17% in the low vulnerability zone, and 15% in the vulnerability zone. On average, 32% is in the high vulnerability zone and 27% is in the very high vulnerability zone.-Location to power sources Construction of camps and temporary accommodation sites in the power transmission routes due to the provision of lighting and the use of heating devices. The evaluation of the results of the status of Kermanshah city based on the index of access to electricity resources using GIS analytical-mapping software shows that 9% of the city area is in the very low vulnerability zone, 8% in the low vulnerability zone, 8% in the medium vulnerability zone, 26% in The zone of high vulnerability and 49% is placed in the zone of very high vulnerability.-The final map of the optimal location of temporary accommodation bases after defining the important criteria and analyzing the indicators in the studied area is as follows: The results of the combination of 9 indicators in the city of Kermanshah indicate that 1% of the city area In the area of very low desirability, 11% is in the area of low desirability, 37% is in the area of medium desirability, 38% is in the area of high desirability, and 13% is in the area of very high desirability.4-Discussion&ConclusionsIn this research, according to the nature of the research and examination of the environmental conditions of Kermanshah city and the important indicators that are selected and evaluated according to the topic. After examining the determining and influencing factors on the temporary accommodation system and identifying the factors, the results were 9 indicators, which should be applied in the present study with general and specific evaluations (relative to the conditions of the study area). It became a scientific source of consolidation. Investigating and identifying the most accurate features in choosing the location of safe shelters: (slope, access to roads, distance from centers and management, access to firefighting centers, access to water and electricity sources, distance from flood-prone areas, and distance of dangerous risks) is considered And the results of the research showed that the important criteria and options in choosing the right place for temporary accommodation are centers that are identified as the best places that are far from the river and sensitive and dangerous uses such as gas stations and pressure lines. It should be maintained strong and close to essential service centers such as medical centers and fire stations, provided with water and electricity sources, accessible by communication lines, and the probability of damage and blocking of roads should be low. Examining the points selected in the final map shows that in the city of Kermanshah, these points are suitable for use according to important criteria such as: accessibility, distance from sensitive uses, proximity to service areas and distance from flood prone areas. It is in critical condition. The results of the current research show the capability of multi-criteria decision-making methods and geographic information system in identifying areas prone to temporary settlement. Therefore, according to the findings and results of this research, it is suggested that relevant organs, departments and organizations such as the municipality, the governorate, the crisis management center of the Kermanshah Fire Organization, etc., by creating comprehensive and updated databases of all details and elements A city based on the geographic information system should always be prepared for the temporary settlement of the population in the wake of the earthquake crisis. -Preparation of basic and suitable infrastructures for selected sites such as sanitary facilities, water sources, lighting system, etc., so that in case of an earthquake, it has the necessary conditions to accommodate the population, and the need to spend time for not provide these services. Accommodation centers should be located near roads that provide access to different parts on the one hand, and on the other hand, the probability of damage and blockage of these roads is low so that the risk of cutting off access, accommodation, relief and rescue operations does not stop. Zagros seismic zone has its own seismic mechanism. The fault systems and the earthquakes that occurred there follow the special pattern of the Zagros earthquake province, so planning and management should be done by evaluating the existing conditions and taking into account all the conditions of the region and the needs of the people. be carefully examined.
Behzad Rayegani
Abstract
Extended Abstract Introduction The process of identifyingthe differences in the status of an object or phenomenon by observing it at different times is called the change detection. In remote sensing change detection, the quantity of a phenomenon is examined from multi-temporal images, and is usually ...
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Extended Abstract Introduction The process of identifyingthe differences in the status of an object or phenomenon by observing it at different times is called the change detection. In remote sensing change detection, the quantity of a phenomenon is examined from multi-temporal images, and is usually done with the help of multispectral sensors. In remote sensing change detection studies, the type and manner of performing atmospheric correction is one of the most important questions of researchers. In most cases, due to lack of sufficient information or experience and knowledge, absolute radiometric correction is not possible and researchers need to use relative radiometric correction and image-based methods. One of the best image-basedmethods is the radiometric normalization using pseudo-invariant features (PIFs). However, the proper way to select these homogeneous regions remains an important challenge.Therefore, in this research, a very simple method is proposed based on the definition of pseudo-invariant features that automatically identifies these areas and uses a regression process for automatic normalization. Materials and Methods The proposed method in the research is based on the radiometric normalization using pseudo-invariant features. Therefore, it was necessary to identify these areas at first, however, the aim was the automatic extraction of PIFs. According to the definition of pseudo-invariant features, a few basic conditions are needed to define a PIF, therefore, here we have tried to simplify these conditions in order to fall into an automated process: 1- Removing water bodies: The study area has a major part of the Persian Gulf coast and water body, which is affected by the tidal wave and under flood conditions; it is affected by the suspended particles of the rivers. Hence, the first step was to remove the water bodies from the images. To mask water from the images, one of the conditions was the pixel value in the NIR band should be less thanthe pixel value in the blue or green band; and another condition was the pixel value in the NIR band should be less the average minus 1 standard deviation of the entire image. 2- Removing the areas with vegetation: Generally, in regions with vegetation, the reflectance of the NIR band is higher than RED, therefore, a simple criterion for masking the vegetation is the use of this condition. However, given that the images used in this research are raw and unprocessed, a statistically average was used in this condition. First, the water mask was applied to the images and then, the average of difference of the NIR band and the RED band in the remaining area was obtained. Finally, those areas were selected as vegetation in the whole image,in whichthe difference between these two bands was higher than the calculated average. 3- Flatness criterion: The flatness of the area is the simplest criterion for identifying the pseudo-invariant features (PIFs) and is accessible by a digital elevation model with only a slope threshold however, due to the flatness of the study area, this criterion was ignored in this study. 4- Identifying areas with little or no change over time: In this study, in order to evaluate the effect of radiometric correction in the remote sensing change detection, image algebra change detectionmethodwas used. In this method, spectral image enhancement is done by the use of commonly used spectral vegetation indices. Among the spectral vegetation indices based on the unsupervised classification function, and the measures of the dispersion about the mean of a distribution such as the coefficient of variation, the NDVI index showed a better performance. Accordingly, the NDVI index, which proved to be effective in similar studies, was used further in the analysis. In this index, the NIR band and RED bands are used. Therefore, to identify the unchanged areas, unchanged regions in the NIR and RED bands used in this spectral index were identified and combined. For this purpose, water and vegetation masks were first applied to the multispectral image. Then, the OLI image was stretched to 8 bit to match the ETM + image. In the next step, the difference between the two NIR bands for these two sensors was obtained and the mean value and the standard deviation were calculated. Finally, in order to have the least error, an area was taken into consideration as unchanged area, in which the following relation was present:. The same analysis was done on the red band (). These two criteria were combined together to obtain the unchanged areas by the AND Boolean logic method. Each one of this four conditions is easy to manually apply to the data with the least processing experience, but in this study, these conditions were automatically generated by the Spatial Model Editor of ERDAS IMAGINE. Radiometric normalization was performed by identifying the pseudo-invariant features (PIFs). In order to validate the accuracy of the proposed method, absolute radiometric correction using ATCOR, FLAASH and ATMOSC methods, and relative radiometric correction using both empirical line calibration method and dark object subtraction method and automatic radiometric correction using QAC and AAIC methods were applied on the data.The output of all atmospheric correction methods and the proposed method was applied in image algebra change detection in the form of a difference and with a threshold of twice the standard deviation from the mean to be checked by 219 points. Results and Discussion The results of validation along with the qualitative studies derived from the histogram comparison proved the proper functioning of the proposed method (Kappa greater than 0.8), and investigating with the help of cross tables indicated that the performance of the proposed method is very similar to that of the empirical line calibration method (More than 76%). Conclusions It should be noted that, some unique features in the present research proposal, including simplicity, automation, negligible systematic error, the possibility of using in a biomarker for degradation warning system, the independence on the type of sensor used, differentiate it from other radiometric correction methods, hence, our suggestion to the researchers interested in the remote sensing change detection of the natural ecosystems is to use the findings of this research.
Geographic Data
Majid Goodarzi; Farkhondeh Hashemi Ghandali
Abstract
Extended AbstractIntroductionUrbanization is a developing phenomenon, and the analysis of the appropriate location and the geographical distribution of urban green space plays a significant role in the development and future of the city. Although in the past, green spaces were primarily manifested in ...
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Extended AbstractIntroductionUrbanization is a developing phenomenon, and the analysis of the appropriate location and the geographical distribution of urban green space plays a significant role in the development and future of the city. Although in the past, green spaces were primarily manifested in the beautification and appearance of urban areas, nowadays, for several reasons, it is considered as a breathing space of the cities. The growth of industry and the increase in population in cities have led to speculative constructions that do not pay enough attention to health issues, provision of sufficient light and healthy air, and leisure spaces in buildings. Moreover, the necessity of creating new urban land use to meet the ever-increasing needs of urban dwellers has gradually reduced the share of urban green space, which is the consequence of limiting the access of urban dwellers to nature. But for some reason, at the beginning of the 20th century, the urban man showed a renewed attention to nature and green spaces, which manifests itself in creating functional gardens instead of recreational gardens that respond to the new needs of citizens. The present study aims to Rank the influencing factors to locate urban green spaces in Masjed Soleyman city. Materials & Methods The present applied study employed an analytical-descriptive method. Reliable internal and external sources related to the subject were reviewed, and in some cases, field studies and referrals to related organizations were conducted for data collection. In this research, the DEMATEL-ANP-integrated approach was employed, and the criteria weights were calculated. Then, the layer of each weight was entered into the Arc GIS software.Results & DiscussionAs the research findings show, 14 criteria are involved in the optimal location of urban green spaces in Masjid Suleiman, distance to commercial centers, distance to waste and empty lands, distance to administrative centers, distance to medical centers, distance to educational centers, distance to existing green spaces, distance to industrial centers, distance to urban facilities and equipment, distance to military centers, distance to religious centers, distance to communication paths, and density.ConclusionThe results of this study showed the priority of the mentioned 14 indicators in order from low to high: proximity to residential centers (0.09263, rank 1), proximity to educational centers (0.07428, rank 2), proximity to cultural centers (0.07268, rank 3), population density (0.07154 and rank 4), proximity to communication ways (0.07092, rank 5), proximity to religious centers (0.06979, rank 6), proximity to existing green spaces (0.06967, rank 7), proximity to medical centers (0.06934, rank 8), proximity to commercial centers (0.06923, rank 9), proximity to urban facilities and equipment (0.06902, rank 10), proximity to military centers (0.06874, rank 11), proximity to administrative centers (0.06761, rank 12), proximity to industrial centers (0.06729, rank 13) and proximity to empty and barren land (0.06726, rank 14).
Military and police geography
Aram Khezerlou; Reza Karimi
Abstract
Extended AbstractIntroductionDescribing and evaluating the threats and vulnerability (weaknesses) of cities is a framework for analyzing and managing risks related to possible attacks against key infrastructures. In fact, the identification of threats in the field of passive defense, i.e. intentional ...
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Extended AbstractIntroductionDescribing and evaluating the threats and vulnerability (weaknesses) of cities is a framework for analyzing and managing risks related to possible attacks against key infrastructures. In fact, the identification of threats in the field of passive defense, i.e. intentional man-made threats and possible damages, plays an important role in prevention and preparation for facing and dealing with the negative effects of man-made threats and natural hazards to urban areas, which by knowing the dimensions of risk and damages It is possible to define and develop the level and type of measures to deal with these damages up to the scale of neighborhoods and urban residents. In this research, vulnerability and threat assessment studies are carried out in the new city of Andisheh with a passive defense approach for reasons such as high population density, especially in the city center, proximity to Tehran, and the existence of a large workforce that is mainly employed in Tehran. The increasing and uneven development due to the saturation of Karaj and Tehran, the favorable climate that attracts the overflowing population of Tehran, the centrality between Tehran, Qazvin and Central provinces, the presence of many military and industrial centers around the city, etc.MaterialsThe current research method is descriptive-analytical with a survey perspective (Delphi technique). In terms of nature, considering that the current research is not only about mere description and matters such as recognition and analysis, evaluation and formulation of principles are considered together, therefore it is also included in the category of analytical research. The method of collecting information includes questionnaires, observations and interviews, and the statistical sample of the research consisted of 30 experts and specialists in the field of city, security and safety from organizations and universities related to the subject of the research. MethodsIn this research, the methods of assessing the threats and vulnerability of the new city of Andisheh are as follows:Threat Assessment MethodIn order to evaluate the threats of intentional man-made research, the combination of AHP (Analysis Hierarchy) and FEMA (Emergency Management Agency) techniques have been used to analyze information. After distributing the threat assessment questionnaire and completing it by the community of research experts, the arithmetic mean of the opinions of the community of experts was scored based on the Likert scale, which is common to the FEMA technique. In order for the scores provided in this way to evaluate the identified threats of the research to be effective; AHP method has been used for weighting the threat evaluation indicators.Vulnerability Assessment MethodVulnerability estimation is surrounded by ambiguities and uncertainties; because calculating the amount of past vulnerability using the Boolean model does not allow the vulnerability criteria to be a continuous spectrum. For this reason, IHWP (inverse hierarchical analysis) fuzzy model has been used. The calculation of the score of the selected layers using the inverse hierarchical analysis method is in the form of the following mathematical relations:DiscussionThreat Assessment of Case StudyIn the studied sample, hard threats including air and missile attacks and bombings and people-oriented threats, i.e. demonstrations and riots have the highest probability and biological threats have the lowest probability. The possibility of air and missile attacks on infrastructures such as New Andisheh New Development Company, Gas Department, Electricity Department, Phase II Telecommunications Department, Police Headquarters, Andisheh Grand Bazaar, electrical substations and petrol pumps especially in the city center and also There is a possibility of the threat of demonstrations and riots in the area of National Banks, Export, Housing in the central part of the city, Drekhri Street and Andisheh Big Bazaar, ABFA office. The possibility of bomb threat is also high in Andisheh Grand Bazaar, Basij Base, Andisheh Municipality, Telecommunication Department, two 230 KV substations in the southeast of the city.Vulnerability Assessment of Case StudyIn order to evaluate the vulnerability of the studied area against hard attack such as rocket launchers, ten indicators including property sensitivity, distance from sensitive and important infrastructure, road width, number of floors, population density, building quality, facade materials, access to medical centers and access to fire stations has been selected. 23.06 percent of the city plots are very low vulnerability, 26.78 percent are low vulnerability, 16.75 percent are medium vulnerability, 21.4 percent are high vulnerability and 12.01 percent are very high vulnerability. They have dedicated themselves. It is obvious that the parts located in the north and center of the city, such as sand mines in the northeast, Petropal gasoline pump on Imam Khomeini Boulevard in the center of the city, 63Kv electrical substation on Ostad Forozanfar Street, Phase 2 Telecommunication Department and 3, 4 and 5, and the social security hospital in the city center, which has high building and population densities, the quality of the restored, destructive building, a long distance to medical centers, less road width, more building height, degree of confinement, and more... have been, it had a high vulnerability score. ConclusionIn this research, firstly, the package of sample threats studied in three steps including documentary studies, threat records and experts' opinions were extracted, and then using the AHP-FEMA scoring method, the threat of air-missile attack was selected as the base threat. Then IHWP model was used in GIS software. The results of these studies indicate that nearly 34% of the studied sample has a high and very high level of vulnerability against the threat of air attack. By examining the maps of the spatial distribution of uses and population, the distribution and distribution of relief and structural services, it is observed that the central parts of the city, which have a high population, are more vulnerable. The presence of high importance uses, low population density and high road width, suitable structural quality and high compatibility of uses causes a low score of vulnerability, and at the end, the solutions to reduce vulnerability according to the situation of the sample A case was presented.
Extraction, processing, production and display of geographic data
Khalil Valizadeh Kamran; Maryam Sadeghi; Asadollah Hejazi
Abstract
Extended Abstract:Introduction Monitoring and investigation of land use changes in forest areas provides acceptable information for efficient management of these resources. Also, taking care protecting natural resources requires awareness of the conditions and how to change different land uses. ...
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Extended Abstract:Introduction Monitoring and investigation of land use changes in forest areas provides acceptable information for efficient management of these resources. Also, taking care protecting natural resources requires awareness of the conditions and how to change different land uses. Therefore, the purpose of this research is to evaluate the change of forest use in the forest area of Fandoqlu from 2010 to 2019 by using Landsat 5, 8 images and integrating them with Sentinel 2, Ester images. After preparing images from the years 2010, 2015 and 2019, geometrical, radiometric and atmospheric corrections of the images were done and the classification accuracy using kappa accuracy was% 93, %83, 91% respectively. The land use of Fandoqlu forest area was To model the change of use for 2025 with the Geomod model, it is necessary to prepare a suitability map of the area, which is prepared using the Fuzzy ANP method and the incompatibility coefficient is less than 0.06. In order to prepare a suitability map of four general factors: human, biological, topographic and climatic, and 12 sub-criteria were obtained with Boolean functions, and Boolean land use maps (forest and non-forest) 2010 and 2015 were modeled for 2019 and for modeling Land use for 2025 was done from the base map of 2019 and the transition matrix of Markov chain of land use in 2025 with the CA-Markov model And the result of location changes for 2025 was obtained. To evaluate the accuracy of the model, the agreement and non-agreement of pixels with Klocation and Standard were done with 98 and 95 accuracy, respectively. Modeling results for the year 2025 changes in a decreasing manner; The increase of non-utilized covers and the reduction of forest use, which will decrease from 3204.18 hectares in 2010 to 3070.55 hectares in 2019; According to the results of the human criterion and the sub-criteria of land use and distance from the road, the tourism potential of this area and the attraction of tourists as well as the interference of local residents can have a direct effect on this forest reduction process.Materials & Methods: organizations, people and local, is the only way to protect the forests of this region. In this study, remote sensing data such as satellite images of Landsat8,5, ASTER and Sentinel 2A were used to prepare the baseline map. Climatic data of all parameters up to 1396 were received from the synoptic station of Ardabil province. The digital model of 12.5 altitude was prepared from NASA website to prepare slope maps, slope direction, border layer of the study area and vegetation layer from Ardabil Natural Resources Organization. The research used Arc GIS, ENVI 5.3, TerrSet, eCognition 9 Google Earth pro and SUPER DECITION software. then based on the value and purpose of Reclassify and layer fuzzy. to predict the future conditions of forest cover changes by GEOMOD method, a time map of the start of the modeling process and a map of change appropriateness are needed. Geomod is used to model spatial patterns, forecast and probability of change. GEOMOD is used to simulate patterns of spatial change of use or change between two categories of use (forest and non-forest).Results and Discussion: In order to implement the GEOMOD model, a fit map prepared from the study area is required. Fuzzy ANP method was used to prepare the appropriateness map of the study area, which has four criteria: human (distance from the road, distance from the village, population), topography (slope, direction, height) and biological (land use, lithology, soil), criteria. And the following criteria are used in the map. Climatic parameter (average annual rainfall, temperature, altitude, slope, direction of slope, waterway) was used. 2025 user is required, so using 2015 and 2019 user with CA Markov model for 2025 was modeled. Decreased accuracy was associated. The results of predicting forest spatial changes for 2025 were used from the 2019 Boolean user map and the CA Markov modeled user map. Conclusion: To implement the GEOMOD model, we need a fit map for spatial modeling of changes. In this study, four criteria and 12 sub-criteria discussed in Chapters 3 and 4 were used to prepare a fit map of the region. They have acquired Super Decision software.Conclusion: Using the Boolean forest and non-forest boards and the 2015 and 2019 land use maps with the CA Markov model for 2025, it was modeled. Human, climate and biological have weights of 0.358, 0.258, 0.203 and 0.165, respectively, which the topography achieved the highest weight in Super Decision software. Among the sub-criteria, the type of land use has a high impact on changes in the region. The final output of the fit map was prepared by applying the OR function after applying the weights, which had a better result than the other functions. Finally, using the 2015 and 2025 user maps for 2025, forest spatial changes were made. To evaluate the accuracy of the model, the agreement and non-agreement of spatial pixels were used, which was modeled with Kappa 98% for 2019. The results of spatial change modeling show the high accuracy of the model in predicting spatial changes. GEOMOD results for 2025 will reach 3085 thousand hectares from 3151.9 hectares. Research conducted in different places. the country indicates a decline in forest areas in the coming decades.
Geographic Data
Iraj Teimouri; Akbar Asghari Zamani; Erfan Moharrampour
Abstract
Extended AbstractIntroduction: UHI is a phenomenon whereby urban regions experience warmer temperatures than their rural surroundings. UHI influences well- being and welfare Average energy consumption and consequently, pollution and social equity of cities. Many factors contribute to urban heat island ...
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Extended AbstractIntroduction: UHI is a phenomenon whereby urban regions experience warmer temperatures than their rural surroundings. UHI influences well- being and welfare Average energy consumption and consequently, pollution and social equity of cities. Many factors contribute to urban heat island formation, as time (day and season), synoptic weather (wind, cloud), city form (materials, geometry, greenspace), city function (energy use, water use, pollution), city size (linked to form and function), geographic location (climate, topography, rural surrounds). Due to UHI adverse impacts on urban metabolism, ecological environment, the favourable living condition of cities and overall livability of cities, it has been an important research topic across various field of study and scholars gave more and more attention to it. UHI has been studied for a long time, it was first described by Luke Howard in the 1810s. During the last decade Significant research efforts have been performed to evaluate the urban heat island phenomenon's impact on the urban environment. According the literature review the main goal of this study is; exploring the effect of Urban Morphology on UHI, in the Tabriz city. Materials & MethodThis study is a correlation one. Be. In this research, ArcMap, ENVI and SPSS software have been used to generate data and apply relationships. To conduct this research, Landsat 8 images of OLI sensors at different dates for summer and winter have been used. In this study, to evaluate the UHI and influenced area of the city, the satellite images of land sat 8 OLI/ TIRS (thermal band 10) were used. The land sat 8 OLI/TIRS images that covered Tabriz summer and winter in the year of 2014 to 2019 were provided by USGS.To perform radiometric correction of images from ENVI 5.1 software using FLAASH method. Flash is the first atmospheric correction tool that corrects visible wavelengths and infrared and infrared wavelengths of up to 3 micrometers. In the flash method, the Meta Data file is used to correct the desired bands, which include multispectral bands and thermal bands. For multispectral bands, radiance and reflection operations were performed, but for thermal bands, only radiance operations were performed. In this context, the Lowest and Highest Position, Spatial Autocorrelation, Hot and Cold spots and finally multivariate Regression analysis were used.Results and Discussion The results of this study showed that the high temperature is most widespread in suburban areas especially in north west and south east rather than central parts of the city. According to the research findings, the average temperature of Tabriz in summer for the studied periods is equal to 37.7 ºC. also the average temperature varies in different years and does not show a specific trend. The average temperature of the city during the study period in winter is equal to 11.8 ºC. But according to the finding, the average temperature of the city in summer and winter is low compared to the surrounding areas. The average temperature difference between the city and surrounding areas is 33.7 ºC and 22.5 ºC in winter. Findings related to the autocorrelation pattern of Moran spatial analysis also show that the distribution of UHI in the city of Tabriz is clustered. The present study also showed that urban morphology can affect the intensity of Heat Islands. Based on the findings of regression analysis and calculated F (17.65) and the coefficient of significance obtaind at the level of 0.00, the predictor varizbles can well satisfy the behavior of the research dependent variable in the summer. For winter, the whole model can be generalized according to the calculated F (9.36) and significance coefficient (0.00). on the other hand, the present study showed that the distance from the green space has an effect on the intensity of UHI, so that based on the findings of the study and calculated F(7.596) and significant level(0.00) this can be confirmed.ConclusionThe present study sought to investigate the effect of urban morphology on the intensity of UHI. For this purpose, we used Landsat 8 satellite images and the technique of separate window algorithm to estimate the surface temperature. Spatial statistical analyzes such as Moran and Hot & Cold spots and multivariate linear regression were also used for analysis. In line with previous studies conducted in Iran, this study also showed that the temperature inside the city is cooler than the surrounding temperature and in a way in a city like Tabriz, we are facing cold islands instead of heat islands. The reason can be related to the compactness and high density of buildings in the cities, which requires further research. This study also showed that the surface temperature is affected by urban morphology and distance from green space. The research opens new field for future researches.
Geographic Data
Seyed Asadallah Hejazi; Fariba Karami; Saye Habibzadeh
Abstract
Extended AbstractIntroductionIn recent decades, cities have provided the prelude to widespread urban growth and development as the most important human settlements, due to the increasing degree of urbanization and the increase in urban population, which is one of the most important aspects of global ...
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Extended AbstractIntroductionIn recent decades, cities have provided the prelude to widespread urban growth and development as the most important human settlements, due to the increasing degree of urbanization and the increase in urban population, which is one of the most important aspects of global transformation. In recent decades, following the growing expansion of urbanization and urbanization, as well as the continuous increase in population, many cities in the country have faced significant physical development, which has left planners and city managers with the problem of determining the right axes. And the boundaries of future physical growth of cities have faced. Maku is one of the cities that experienced an annual growth of 3.7 percent between 1996 and 2016, with a population of 46,581. Given the forecast of the increase in the population of the city in the coming years, the identification of suitable land for its physical development is an inevitable necessity. Several factors, including geomorphological features, climatic conditions, geological features, are effective in choosing the location of cities. The study evaluated the role of geomorphology as one of the factors influencing the location and physical development of the city of Maku.Materials and MethodsThe research method is of a descriptive-analytical type with a functional purpose. In this study, raw data was collected through documented and field studies. This study examines the geomorphological factors influencing the physical-physical development of the city of Maku. To evaluate the optimal development of urban land, the components of lithology, soil, slope, distance from the river, direction of slope, height, land use, distance from fault and Road in the area of the surrounding city of Maku were used. To analyze data and select the optimal location, a combination of two phase - electro and Shannon entropy models has been used. To prepare the ground fit layer, the layers in question are standardized and phased in the ArcGis environment using the Phase model and by the calculator instrument and in the form of a raster in the form of a value of zero to one. Finally, the coating of layers using phase logic (gamma) to optimize the development of the city of Maku was determined, and then the development path of the city of Maku was classified into five groups: completely appropriate, relatively appropriate, appropriate, inappropriate and very inappropriate.DiscussionAfter determining the effective criteria in locating and detecting the weight of the criteria, the information layers should be combined with the appropriate method. The composition of the map is obtained by overlapping weighted maps. Merging and combining different spatial layers from different sources together is the main goal of GIS projects and its unique feature, so that the interactions are described and analyzed with the help of predictive models to support decision-makers. The final map of the development potential of the city of Maku was prepared by combining different layers of information and classified according to the Likert scale. In this classification, land was considered suitable for urban development in 5 groups of lands with very low, low, medium, high and very high development potential. According to the above map, most of the city's immediate land is located in the eastern and western parts of the city for Urban Development. The southern and northern lands of the kalbdi District of Maku are also small or very small for the future development of the city. The proximity to the epicenter of earthquakes, the short distance from the river and the location of the flood path are the main reasons for the inadequacy of the above land for the physical development of the city of Maku. The lands located east and West at the entrance of the city from the shout and merchant side are the only immediate areas of the city that are very suitable for the future development of the city.ConclusionAmong the seven geomorphological factors studied, the two factors "altitude" and "lithology" are the highest coefficients of importance, and the factors "slope direction" and "distance from the river" are also the least important. The results of comparative analysis of the eight geographical directions in terms of geomorphological factors also show that in terms of the litholysis factor, the east, west and northwest directions are more desirable compared to other options. In terms of the elevation factor, the Northeast and East Directions are more suitable, and in terms of the distance factor, the West and northwest directions are more preferred. Comparing options in terms of soil factor also indicates a greater favorability of the Northeast and northwest directions. Distance from the river was another component that, based on the analyses, the East and Southeast directions, identified more favorable areas for urban development in terms of this component; and finally, in terms of the slope direction criterion, the lands located in the southeast of the City face greater desirability. After determining the coefficient of importance of the criteria and the relative score of the options in terms of each of the factors studied the coefficients of importance of the criteria and the relative weight of the options were calculated within the framework of the method of the process of hierarchical analysis of the integration and score of each of the eight geographical directions as follows the East was calculated with a gradient of 5 West 5 southwest 1 northeast 2 North 0 south 0 Southeast 4 Northwest 0 thus in terms of geomorphological factors the study word in the ین research orientations east west and the southeast is proposed as a priority for the future development of the city of Maku.
Zoleikha Bagheri (Translator)
Volume 11, Issue 44 , February 2002, , Pages 39-45
Abstract
The Planet Venus is named after the goddess of beauty in ancient myths, though it has been named among various peoples differently. Ancient Greeks called it Aphrodite, the goddess of fertility. For Babylonians this planet was the mistress of gods and the goddess of love, fertility and war. The Chinese ...
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The Planet Venus is named after the goddess of beauty in ancient myths, though it has been named among various peoples differently. Ancient Greeks called it Aphrodite, the goddess of fertility. For Babylonians this planet was the mistress of gods and the goddess of love, fertility and war. The Chinese also considered it a beautiful white spot. With these interpretations, we conclude that Venus has been a symbol of love and beauty since the beginning of civilization. The Greeks living on the island of Cythera, who worshiped Aphrodite, often used the term Cytherean, meaning “related to Aphrodite” for referring to planets. This is an adjective that is used instead of the phrase “related to Venus”.
Majid Mokhtarani
Volume 13, Issue 51 , November 2004, , Pages 41-45
Abstract
Astronomers constantly look for a way to improve techniques and methods of observing the universe. One of the common ways is to use larger and higher-quality telescopes to take pictures from the sky with greater clarity and detail. However, their antennas are physically limited in size and shape, since ...
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Astronomers constantly look for a way to improve techniques and methods of observing the universe. One of the common ways is to use larger and higher-quality telescopes to take pictures from the sky with greater clarity and detail. However, their antennas are physically limited in size and shape, since they must be extended extremely accurately, and for optical telescopes, their optical component must be highly inflexible and accurately shaped. On the whole, astronomers have infrequently criticized the accuracy and advantage of these telescopes. At the moment, the world's largest telescopes are radio antennas that provide the most detailed images of the universe by combining signals from radio telescopes. This method is called the Very Long Baseline Interferometry (VLBI), and can provide images of space objects that are of a thousand times greater in resolution than those of the Hubble Space Telescope.
Abbas Ali Saleh Abadi
Volume 11, Issue 41 , May 2002, , Pages 41-45
Abstract
Each numerical or geometric quantity, or sets of numerical quantities, which are used as reference or basis for other quantities, are called base levels or datums.In geomorphology, two different baseline levels are considered, one of which is flat, which forms the basis of the accurate calculation in ...
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Each numerical or geometric quantity, or sets of numerical quantities, which are used as reference or basis for other quantities, are called base levels or datums.In geomorphology, two different baseline levels are considered, one of which is flat, which forms the basis of the accurate calculation in horizontal surveying in which the curvature of the earth's surface is considered. The other is the elevation base level according to which the height of points are measured and calculated. In other words, in geodetic surveying the coordinates of different points are obtained from a series of initial points with known coordinates by base line parameters. Due to the development of different methods in surveying, several datums or baselines have been defined and produced.
Today, several datum have been defined and produced for development of geodetic surveying and satellite geodetic methods, and there is no need to have more than one datum in this method. But this does not mean a complete replacement of all datums by a single one, since in practice there are initial surveying parameters and quantities that each depend on the different datums. On the other hand, the overall change of datums will require a century to transform all the information in the maps of a country into a new base level. For example, the issue of determining the sovereignty over the border lines of the US state has been on since centuries ago, and even by drawing up a map of disputed borders, military and civilian users still prefer the old systems of surveying measurement over new ones due to special reasons. Consequently, making general changes in determining the base level not only does not eliminate the problem, but may add another variable to initial problems.
Abbasali Salehabadi
Volume 1, Issue 4 , May 1992, , Pages 44-51
Abstract
There are no doubts in the importance and value of papers describing latest research with newest methods in the surveying world, but it seems to the author that it is also of great importance to present, via a number of articles, reports on innovative works with new tools or new methods conducted in ...
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There are no doubts in the importance and value of papers describing latest research with newest methods in the surveying world, but it seems to the author that it is also of great importance to present, via a number of articles, reports on innovative works with new tools or new methods conducted in the country by Iranian experts and published in the surveying scientific and technical publications of the of the country, though with the possibility that what is said in such articles be old or ordinary compared with international achievements in the field.
The review of prominent world surveying publications, especially multidisciplinary publications that represent the overall gamut of mapping techniques, suggests that part of the papers presented are dedicated to introduction of applied experiments. An expert or a group of mapping experts, after carrying out a routine case of surveying in a particular fashion that they believed had been effective in shortening the time needed to achieve the objectives of the plan or economizing it, exposed the results and experiences through an article to other researchers' view. Although the mathematical aspect of the article might be less significant than specialized geodetic or photogrammetric papers, it is nonetheless of significance as a presentation of a particular experience.
Mohsen Madadi; Ali Baratian
Volume 15, Issue 58 , August 2006, , Pages 46-53
Abstract
Urban landscape creates a certain local climate that distinguishes it from the rural landscape around it. This is confirmed by the presence of a thermal island and by studies that show that over a quiet and clear-sky night the temperature of the city and that of the village differ above 12 degrees of ...
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Urban landscape creates a certain local climate that distinguishes it from the rural landscape around it. This is confirmed by the presence of a thermal island and by studies that show that over a quiet and clear-sky night the temperature of the city and that of the village differ above 12 degrees of Celsius. Different land uses in the city create a mosaic of hot and cold areas. For example, there can be a difference of more than 7 degrees of Celsius between a park and a building environment. The geometric state of the streets is important in thermal pattern of cities.
Mas'ud Taghva'ei; Marziyyeh Shahverdian
Volume 12, Issue 47 , November 2003, , Pages 46-55
Abstract
Parks and green spaces are very valuable because of their dual role, namely recreational importance as well as impact on preservation and balance of urban environment, mitigation of pollution and cleansing air, and reduction of spiritual and physical exhaustion. The role of these spaces is not limited ...
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Parks and green spaces are very valuable because of their dual role, namely recreational importance as well as impact on preservation and balance of urban environment, mitigation of pollution and cleansing air, and reduction of spiritual and physical exhaustion. The role of these spaces is not limited to recreational issues, therefore they need to be considered by planners independently.Attention to criteria such as characteristics of flowers and trees, their arrangement, their applications in different places and conditions on the one hand, and taking into account of human issues such as the tendencies and feelings of human beings, their behavioral patterns, the culture of parks (dealing with and using them), the proper equipment and facilities, habits, customs and countless issues of the same kinds on the other, necessitate an accurate and comprehensive design. In this paper, we have tried to study the above materials in a detailed way so that they can meet the different needs of readers and people of different ages and social groups.
Hasan Rajabpour Kari
Volume 11, Issue 42 , August 2002, , Pages 47-50
Abstract
The city of Babolsar is a new city still influenced by traditions of a rural culture; it has nevertheless grown considerably over the past hundred years and cannot be considered as a rural fortress anymore. It has mainly grown in a wild manner in low areas surrounding it.In general, three major factors ...
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The city of Babolsar is a new city still influenced by traditions of a rural culture; it has nevertheless grown considerably over the past hundred years and cannot be considered as a rural fortress anymore. It has mainly grown in a wild manner in low areas surrounding it.In general, three major factors including the sea, river and road network have had direct impact on the physical and spatial development of Babolsar.The great number of young population and the excessive migration of villagers to Babolsar are among major problems of the city. This will certainly delay the process of development, and it is not unexpected that the city reach a critical level of population.It is necessary to deal with this important issue based on accurate planning, including birth control and demographic policies, development of rural facilities and capabilities, and strengthening of small urban centers around Bablosar.
Ashraf Mandani
Volume 21, SEPEHR , February 2013, , Pages 48-50
Abstract
Water resources and their appropriate exploitation are among important and critical issues in deserts and semi-desert areas. Qom has always faced water shortage and Panzdah-e Khordad Dam was built between Qom and Delijan to resolve the problem. This dam faces lots of sedimentation. This inevitably results ...
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Water resources and their appropriate exploitation are among important and critical issues in deserts and semi-desert areas. Qom has always faced water shortage and Panzdah-e Khordad Dam was built between Qom and Delijan to resolve the problem. This dam faces lots of sedimentation. This inevitably results in dam filling and shortening of its useful life. Therefore, studying erodibility potential in upstream basin is essential. The present study primarily seeks to divide the basin into different zones based on formations sensitivity to erosion and their role in the creation of new sediments. To reach this goal, boundaries of Panzdah-e Khordad Dam basin were identified using 1:50000 topographic maps. Then, it was carefully implemented on 1:50000 geological map of Qom-Delijan. After producing geological maps, channels, precipitation, geomorphology, slope and soil permeability were digitalized. Then, erodibility intensity in Panzdah-e Khordad Dam basin was produced using GIS, layer scoring and integrating techniques (Overlay index). Results indicate that sensitive units with severe erosion cover a vast area of central basin and a large volume of soil in this semi-desert area is sedimenting in Panzdah-e Khordad Dam reservoir. Finally, the article proposes some logical solutions to control and reduce erodibility of soil.
Morteza Ashnedar (Translator)
Volume 8, Issue 30 , August 1999, , Pages 48-49
Abstract
Military centers in many advanced countries have utilized the GIS technology through a broad network called SIMNET in order to model battlefields and operational maneuvers, and they use it in different stages of military maneuvers. These stages might be implemented independently by different military ...
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Military centers in many advanced countries have utilized the GIS technology through a broad network called SIMNET in order to model battlefields and operational maneuvers, and they use it in different stages of military maneuvers. These stages might be implemented independently by different military corps or through interconnection among different corps. The system mentioned above is a forerunner in creation of vast domain-based connections between different military maneuvers taking place around the country via a continuous and homogeneous network, and in this method the distributional modeling has been exploited. In this system, computer images and the technology of connection networks have been combined with the aim of creating a common artificial environment to achieve a situation like that of real world. Here the ARC/INFO software is used for establishment of a digital data bank that can be used for distributional modeling of military operation.
Ali Haj Agha Mohammadi
Volume 12, Issue 45 , May 2003, , Pages 49-53
Abstract
The Bushehr province, geographically located along the vast sea shores with a population of more than 700,000 people, contains tremendous natural wealth and resources. This province holds the second place amongst the country’s provinces in terms of the number of fishing and floating boats. In this ...
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The Bushehr province, geographically located along the vast sea shores with a population of more than 700,000 people, contains tremendous natural wealth and resources. This province holds the second place amongst the country’s provinces in terms of the number of fishing and floating boats. In this research, the socioeconomic and cultural characteristics of this province and it’s quality of productive performance is studied in relation to major factors such as individual and familial characteristics of fishermen, coordinates of the vessels and fishing centers and the technology of fishing at micro level, and then the performance of fishing in this province and its role in providing a significant portion of the livelihood of inhabitants of this province and creating employment in the area and the existing obstacles on the way of increasing the quantity and quality of fishery are investigated. Based on the findings on several fishing areas in Bushehr, the conclusion was made that if the distribution of fishing sites, the type of fishing, the cost of fishing equipment, the relationships within fishing groups, the atmosphere governing the life of fishery and the relationship of these groups with the Fisheries Organization are not paid due attention, there will be some problems, and it is not unlikely that the Fisheries Organization miss its goals in the long run.
Ahmad Pour Ahmad; Mohammad Komeili
Volume 20, Issue 78 , August 2011, , Pages 50-57
Abstract
Until now, a major application of scientific methods has been to estimate and predict the values of a variable by referring to the values of one or more other variables associated with it. In this paper, we examine the most common type of "correlation", or estimation based on structural relationships ...
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Until now, a major application of scientific methods has been to estimate and predict the values of a variable by referring to the values of one or more other variables associated with it. In this paper, we examine the most common type of "correlation", or estimation based on structural relationships between variables, which leads to the creation of a simple linear model. The use of linear models in a variety of urban analyses is quite commonly accepted due to the relative simplicity and accuracy of these models. Linear models usually show tendencies over time, which may not be taken into account through abstract or chart-based analyses. Linear models are used to express events when non-scientific methods are incomplete and unsatisfactory (and predict the appearance and time of the events).
Hossein Mohammadi; Gholam Reza Roshan
Volume 16, Issue 61 , May 2007, , Pages 50-53
Abstract
On Monday, August 29, 2005, the Hurricane Katrina swept the South American coast of the Gulf of Mexico at a speed of 250 kilometers per hour, causing thousands of deaths and enormous financial losses in three states of Louisiana, Alabama and Mississippi. Although Katrina was a natural disaster, it was ...
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On Monday, August 29, 2005, the Hurricane Katrina swept the South American coast of the Gulf of Mexico at a speed of 250 kilometers per hour, causing thousands of deaths and enormous financial losses in three states of Louisiana, Alabama and Mississippi. Although Katrina was a natural disaster, it was nevertheless man-made, caused by abnormal actions of human beings on natural environments and the increasing use of greenhouse gases in industrialized countries, especially in the United States. In the following, it can be stated that one of the political consequences of Katrina's occurrence has been to disturb security and public order during the occurrence of this incident.
Aliakbar Rasuli
Volume 1, Issue 3 , August 1991, , Pages 50-55
Abstract
In this paper, we try to emphasize on the importance of new display systems by reviewing educational and research limitations and deficiencies of traditional methods of displaying land features. The three-dimensional representation of the GIS and its practical aspects forms the next section. The main ...
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In this paper, we try to emphasize on the importance of new display systems by reviewing educational and research limitations and deficiencies of traditional methods of displaying land features. The three-dimensional representation of the GIS and its practical aspects forms the next section. The main part of the paper is related to three-dimensional simulated digital-graphic models of land features. In the same vein, cartographic and computer techniques in creating three-dimensional images are of interest. In the last section, we make conclusions and suggestions after a brief review of the applications of visual simulated models in geology and geomorphology. Keywords and main subjects of the article include:
Map, GIS (Geographic Information Systems), GIS 3D Modeling, Modeling, Cartographic and Computer Techniques, Digital-Graphic Models, Land Features, D.E.M, Application of Models in the Earth Sciences.
