Mahtab Safari Shad; Mahmoud Habibnejad Roshan; Alireza Ildoromi
Abstract
Abstract The issue of drought is very important in water resources studies. Meteorological drought indices are calculated directly from meteorological data such as rainfall, and in the absence of such data, they will not be useful in monitoring drought. Therefore, remote sensing techniques can be considered ...
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Abstract The issue of drought is very important in water resources studies. Meteorological drought indices are calculated directly from meteorological data such as rainfall, and in the absence of such data, they will not be useful in monitoring drought. Therefore, remote sensing techniques can be considered as a useful tool in monitoring drought. In this research, using MODIS remote sensing satellite images, the trend of vegetation normalized index changes in Isfahan province for the years 2000-2008 was investigated. In addition to vegetation, NDVI index can be effective in addition to natural vegetation for drought monitoring, especially for drought monitoring of dry farming type.Considering this index, the vegetation cover was classified into 4 groups and the area of each of the classes was calculated. Finally, two SPI and NDVI indices were compared. The result of calculating the SPI index show that the occurrence of severe drought is in 2008 and moderate droughts are in 2000 and 2001 in Isfahan province respectively. The calculation of the NDVI index in these three years also indicated that the poor vegetation cover has been significantly increased. High level Pearson correlation (+0.704) was observed between SPI and NDVI in significant level of 0.01. However, the results of the effect of rainfall on the NDVI index showed that there is no coincidence of the occurrence of meteorological drought and agriculture droughts in all years. For the year 2006, despite the fact that precipitation was higher than the years before and the years after and more than the average rainfall of the province, but based on the results of the NDVI index, agricultural drought has occurred this year (Devaluation of the NDVI index). On the contrary, in 2002 and 2004 that precipitation was lower than 2006, but dry farming and pasture conditions were better than 2006. And also, in 2003 with a difference of 2 mm in precipitation compared to 2002, the NDVI index value dropped significantly. The results of this research double the necessity of defining a profile that expresses all of these issues.
Seyyed Eskandar Seydaei Seyyed Eskandar Seydaei; Seyyedeh Somayeh Hosseini
Abstract
Abstract
In the sustainable tourism development approach, not only market needs are considered, but also the needs of society and the natural environment are emphasized. In this regard, GIS can be used for many tourist, planning and modeling activities. The present study aimed to provide a model for ...
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Abstract
In the sustainable tourism development approach, not only market needs are considered, but also the needs of society and the natural environment are emphasized. In this regard, GIS can be used for many tourist, planning and modeling activities. The present study aimed to provide a model for access to tourist attractions for the sustainability in tourist hubs of Isfahan province. Regarding the studied components, this research is an applied one in terms of type and a descriptive-survey in terms of method. This research was conducted based on the closest access considering the speed of access (road quality) in terms of minutes, and in order to provide a model for the stability of areas with the highest attraction and concentration of tourist in a zone rather than a point. The cities of Isfahan and Kashan (historical-cultural) and the cities of Semirom and Fereydoon Shahr (natural tourism) have the highest tourist capacity in the province, respectively. The results of the study show that according to the "Closest Access" model, five classes have been taken into consideration for the sustainability of the four tourist hubs in the province. The first class covers the potential rural and urban locations to a 60 minute radius (according to experts, the 60 minute distance is the distance that the tourists tend to travel by car on the way to the desired attraction) from the natural tourist hubs, the West (Fereydoon Shahr), the Southwest (Semirom) and the historical-cultural tourist hubs of Isfahan and Kashan which should be addressed by the authorities and tourism planners of the province to instruct tourists.