Volume 25, Issue 79 (12-2025)
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Nasiri D, Borna R, Zohorian pordel M. (2025). Temporal and spatial monitoring of drought using remote sensing technique (case study of Khuzestan province). jgs. 25(79),
URL: http://jgs.khu.ac.ir/article-1-4220-en.html
URL: http://jgs.khu.ac.ir/article-1-4220-en.html
1- Ahvaz Islamic Azad University, geography group
2- Ahvaz Islamic Azad University, geography group ,rborna22@gmail.com
2- Ahvaz Islamic Azad University, geography group ,
Abstract: (5834 Views)
Widespread and frequent droughts in recent decades in Khuzestan province have become one of the most important challenges of this province. The use of remote sensing products in temporal and spatial monitoring of drought can play a key role in managing this risk and reducing and adjusting its destructive effects. The main goal of this research is to provide a remote sensing index for temporal and spatial monitoring of drought in Khuzestan province and its validation using station meteorological drought indices. In this research, by using the products of vegetation (MOD13C2) and land surface temperature (MOD11C3) of MODIS sensor, a drought index based on vegetation called VHI plant health index was produced. SPI Meteorological Drought Index, which was based on station rainfall data during the statistical period of 2000-2012, was used to evaluate and quantify this index. The comparison of VHI drought index with three-month SPI meteorological drought index values showed a significant correlation between 0.68 and 0.75. By identifying 4 years with widespread and relatively severe drought in Khuzestan province (based on both VHI and SPI indices), which included the years 2000, 2005, 2012, 2015, the spatial distribution pattern of meteorological drought and VHI plant drought to In general, it indicated that the northern parts of the province were generally involved in mild to moderate droughts and the southern parts were generally involved in moderate to severe droughts. The spatial correlation matrix based on the number of 2500 pixels with dimensions of 5x5 km, which included VHI and SPI values of selected drought years, indicated the existence of a significant spatial correlation between the two mentioned indicators. In the widespread drought of 2000, at the level of Khuzestan province, two drought indices VHI and SPI, the correlation was equal to 0.47, and in 2005, equal to 0.35, and
Type of Study: Research |
Subject:
climatology
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