In collaboration with Iranian Watershed Management Association

Document Type : Research Paper

Authors

1 MSc, Faculty of Agriculture, Shahrekord University, Iran

2 Assistant Professor, Faculty of Agriculture, Shahrekord University, Iran

3 Associate Professor, Faculty of Agriculture, Shahrekord University, Iran

Abstract

One of the resources that have been severely affected by drought is groundwater, however it has been considered less than other water resources. Due to the recent droughts especially in the central regions of Iran, investigating the impact of droughts on water resources is very important. The main aims of this study are characterization of meteorological and hydrogeological droughts, assessment the effects of drought on groundwater level fluctuations and determining the critical regions of Shahrekord Plain Aquifer. For this purpose, modified Standardized Precipitation Index (SPImod) and Groundwater Resource Index (GRI) were used to assess meteorological and groundwater droughts, respectively. Also, the cross-correlation test was used to investigate the relationship between the meteorological drought and the groundwater drought. In this research, the monthly precipitation data of Shahrekord synoptic station and monthly groundwater level data of 35 piezometers in this plain in the period of 1984-2015 were used. Based on the result of GRI index, Shahrekord Aquifer was divided into three regions which cover the north and northwest, central and south-east and southwest. The results of correlation between modified SPI in various time scales of 1, 3, 6, 9, 12, 18, 24 and 48 months and GRI index indicates the highest correlation between 18-month modified SPI and GRI. The results also showed that the effect of meteorological drought on GRI index appears with 6 and 18-month delay on northern and central areas, respectively, and without delay on the South West of the Shahrekord Aquifer.

Keywords

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