نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه پیام نور
2 هیات علمی
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Drought is a natural phenomenon that has intensified in recent decades, particularly in arid and semi-arid regions. This study analyzes agricultural and meteorological drought indices using the Google Earth Engine platform and evaluates their correlation with ground station data in Hormozgan Province. The indices NDVI, VCI, VHI, and SVI were used to assess agricultural drought, while the TCI, PDSI, SPI, and PCI indices were employed for meteorological drought. These indices were calculated from MODIS sensors for the period between 1999 and 2021. The results indicated that VCI and VHI indices for agricultural drought, and PDSI and SPI indices for meteorological drought, exhibited significant trends across all stations. The positive significance of these trends could be attributed to the presence of off-season agricultural products, such as vegetables and greens, cultivated from early October to mid-May in various regions. Given the region's hot and dry climate, most of the rainfall occurs during the cold seasons. The Jask and Hajiabad stations showed significant positive trends at the 99% confidence level with the VCI, VHI, PDSI, and SPI indices during the selected MSPI periods. Similarly, the Minab station demonstrated significant positive trends at the 99% confidence level with the VHI, PDSI, and SPI indices. The findings revealed that a large portion of the region is classified under severe to very severe drought conditions, posing a serious warning for the province. Satellite-based indices, along with ground-based meteorological indices, can effectively monitor drought trends. However, none of these indices are inherently superior to the others; their performance depends on the region's climatic conditions, topography, vegetation cover, and soil type.
کلیدواژهها [English]
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