Document Type : پژوهشی
Authors
Department of Nature Engineering, Faculty of Natural Resources and Earth Sciences, University of Kashan, Kashan, Iran
Abstract
Drought is one of the most complex meteorological phenomena that can occur in most parts of the world; however, its impact is more pronounced in arid and semi-arid regions, making its study crucial for water resource management. In this research, the meteorological and hydrological drought status in the Qom-Kahak, Neyzar-Salafchegan, Marvdasht-Kharameh, and Beyza-Zarqan basins located in the Central Plateau basin was investigated using the SPI, SPEI, RDI, and SSI indices on 1-, 6- and 12-months timescales during the statistical period of 2004 to 2023. The results indicated that more than 95% of the study stations have experienced all conditions from very wet to very severe drought. SPI index on 1-month time scale in all study stations and SPEI index on 6-month time scale in 83.3% of stations and on 12-month time scale in 67.7% of stations showed drought more severely than other drought indices. Examination of the occurrence frequency for the SSI hydrological index classes on a 12-month timescale also showed that the highest drought classes were observed in Shadabad and Kharamah stations. The comparative analysis of meteorological and hydrological drought indices in each of the basins showed that showed that the highest cross-correlation between the SPI and SSI on a 12-month timescale was observed in Salafchegan and Qaleh Cham stations with a forward time lag of 12 months equal to 0.574, and the highest pearson correlation coefficient on a 12-month timescale was for Salafchegan-Qaleh Cham stations (r = 0.309 and p-value = 0.001).
Keywords
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