Journal of Watershed Management Research

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Musavi S A, Solaimani K, Shokrian F, Roshun S H. (2021). Investigation of the Relationship between Groundwater Variations and Drought Using SPI and GRI Indices in Lordegan Plain. jwmr. 12(23), 65-74. doi:10.52547/jwmr.12.23.65
URL: http://jwmr.sanru.ac.ir/article-1-997-en.html

drinking and industrial sectors are very emphasis in our country. Agricultural activities have a very high contribution in harvesting of groundwater aquifers. So, today, irregular extraction of these sources caused to decrees the quantitative and qualitative aquifers characteristics. The aim of this study was to investigate the effect of meteorological drought on groundwater quality and quantity in Lordegan plain in Chaharmahal and Bakhtiari province. For this purpose, quantity and quality of groundwater data (20 piezometric wells) and precipitation data (7 rain gauge stations) from the regional water supply company of the Chaharmahal and Bakhtiari province was obtained. Then, using Run-Test and Kolmogorov-Smirnov tests, homogeneity and normality of the data were tested. In the following, the DIP software was used to estimate the standardized precipitation index (SPI). Groundwater Resource Index (GRI) was calculated using Excel formulation software. The results of this study showed that the Groundwater Resource Index (GRI) for most years was mild and moderate, and less severe and very severe droughts. Also, based on the standardized precipitation index (SPI), most droughts were mild to moderate. Thus, according to SPI and GRI indices, the plain experienced meteorological and groundwater droughts. Spatial meteorological and groundwater drought maps indicate that drought has been occurred in central and eastern, also in eastern and northeast part of plain, respectively.