Ezzatollah Ghanavati; Mohammad Reza Sarvati; Reza Mansouri; Samira Najafvand
Abstract
Extended Abstract
Introduction
Urban streams have great potential for building a green space network for an entire city. In essence, urban streams have great potential to function as a key part of an urban green infrastructure providing valuable ecosystem services to urban residents. Urban stream organizing ...
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Extended Abstract
Introduction
Urban streams have great potential for building a green space network for an entire city. In essence, urban streams have great potential to function as a key part of an urban green infrastructure providing valuable ecosystem services to urban residents. Urban stream organizing has one of the key topics in water management and land use planning in Iran. There are still ongoing controversies associated with organizing plan. Vegetation is one of the key components of urban stream restoration to increase its natural and esthetic attributes. However, formulating and maintaining planting/vegetation is not easy because it requires consideration of not only the usual factors for general open space design such as ground-level ecological capacity and residents’ preference, but also plants’ hydrophilic aspects. To be selected for stream basin vegetation, plants and vegetation should not be easily washed away during flooding and have a high survival rate even with extended submergence. One of the situations that concerns the applied geomorphologist, is that geomorphological events have a direct impact on man. The irregular development in Tehran, over the past half-century, in addition to the destruction of parts of a coherent historical context and cultural assets and historical heritage surviving the cause is a large part of the natural heritage of floodways.
Materials and Methods
Farahzad stream is one of the floodways in the North of the metropolitan Tehran. Farahzad basin in terms of geological structure is part of Central Alborz and has semi-dry climate. By organizing floodways, urban landscape, walkways and recreational confines as well as environmental and urban landscape conservation sustainable development will be realized. In the urban areas, sections of society play an important role in organizing the floodways. Farahzad basin witha geographical longitude of 51ْ19´ 00 to 51ْ 22´ 00 E and a geographical latitude of 35ْ45´ 00 to 35ْ 53´00 N with an area of 28 square kilometers is located in the North of Tehran city (North of Tehran Province). The maximum amount of rainfall in the area is more than 600 mm with an average of 422 mm per year.
This study aims at assessing the organizing appropriateness of the Farahzad city’s floodways with the geomorphological factors such as elevation, slope, aspect, precipitation, soil, land use and land cover (vegetation), distance from liner features (such as fault, river, road), and overlying of them, with emphasis on organizing floodways using geographical information system (GIS), remote sensing (RS), and AHP. Methods based on analytical - descriptive, library studies using geographical Information system (GIS) software and analytic hierarchy model in Expert choice software over the map of organizing proportion of Farahzad city-floodways based on the geomorphological factors have been proposed.
Among layers used in this study, the most weight was allocated to elevation. The next layer in order of importance includes: slope, aspect, rainfall, vegetation, soil, distance from streams, faults and roads. Among the factors and layers used in this paper, the lowest relative weight was assigned to the layer distance from the road.
Results and Discussion
Knowledge of key geomorphological processes is an integral part of understanding the evolution of any landscape. Results of this study show that most organized floodway areas of geomorphological factors is considered as a very low and low status proportion (44 per cent). Also, 33 per cent of the area has been organized highly and very highly to fit the situation with the geomorphological factors. The results show that no attention has been paid to the morphological parametersin environmental management and urban planning.
Conclusion
In this paper, the Farahzad Basin was studied using topographical maps with 1:50000 scales and geological maps with 1:100000 scales, Landsat satellite imagery with high resolution and the overlying and weighed methods. The Landsat ETM+ satellite image analysis during 2005 and 2010 (before and after the organization) and their comparison revealed that Farahzad floodways vegetation had grown 26 per cent after the organization with respect to the previous year’s organization. Also, hazards such as landslides, slope instability and even protection of the environment, were affected by landforms and geomorphological parameters.
Reza Mansouri; Ezzatollah Ghanavati; Mohammad Reza Servati
Abstract
The vast country of Iran has diverse geographical conditions with 11 out of 13 known climates in theworld. This hasresulted in many environmental,ecotourist, recreational, and economic capabilities. The tourist infrastructure of any region is the nature of that area and as one of its parts,geotourism ...
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The vast country of Iran has diverse geographical conditions with 11 out of 13 known climates in theworld. This hasresulted in many environmental,ecotourist, recreational, and economic capabilities. The tourist infrastructure of any region is the nature of that area and as one of its parts,geotourism has in recent years, experienced a dramatic and significant upsurge in the world and has had a great influence on regional development. Geomorphological and geological visit is one of the main aspects of Geotourism. Ilam province with a surface area of 19,086 KM2ranges from 31 deg. 58 min. to 34 deg. 15 min. North Latitude from the Equator and 45 deg. 24 min. to 48 deg. 10 min. East Longitude from the Greenwich. The province is considered as one of the most prone areas for development of geotourism with its geotourist, geomorphological and geological attractions such as caves, mountains, rivers, waterfalls and springs. In this regard, attention to the natural capacities, conservation, presentation and utilization of geotourism attractions can play an important role in the sustainable development of the province,while it can be effective in solving problems such as unemployment and creation of employment in the province.This research studies the characteristics of Ilam province in a library, field, descriptive - analytical method and by using maps and satellite images,
Ezzatollah Ghanavati; Reza Mansouri; Seyyed Abdolsalam Heydari
Volume 22, Issue 86 , June 2013, , Pages 29-41
Abstract
Coastal Zones have been one of the most populated areas on the Earth.Nowadays, abut 60 percent of the Population lives in costal zones. In most coastal countries, cities in the coasts have high population density. In respect to the highly populated costal areas and human’s exploitation of their ...
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Coastal Zones have been one of the most populated areas on the Earth.Nowadays, abut 60 percent of the Population lives in costal zones. In most coastal countries, cities in the coasts have high population density. In respect to the highly populated costal areas and human’s exploitation of their gifts on the one hand, and the fact that 1/3 of world population reside on these areas on the other, the significance of further exploration and examination of these areas comes into figure. It is true abut Iran which has a long coastal line including the Caspian Sea, Sea of Oman and the Persian Gulf. Thus the importance of the various problems caused by different factors, natural and human-created on the coasts, requires the use of new technologies to the integrated management and sustainable develop ment of these areas in line with the system perspective to action. Based on different scopes, different method of are available for the classifications of beaches. Smartline format has been used and refined during 2007-2009 to create a detailed nationally consistent coastal geomorphic )landform( map of Australia, by combining data from over 200 prior map ped data sources. The Coastal Smartline Geomorhic and Stability Map of Australia was compiled in the first instance for use in assessment of Australia’s coastal vulnerability to sea-level rise and climate change by the Commonwealth Department of Climate Change and Geosience Australia. Accordingly, this paper exploits this method for mapping the coastal zones of Iran.
