Groundwater Drought Investigating using SWI and GRI Indices)Case Study: Marvdasht Kharameh Aquifer)

Groundwater drought occurs when groundwater as a source of water supply, are affected by prolonged Meteorological drought. In groundwater drought process, at first groundwater recharge, later groundwater levels and finally groundwater discharge are decreased by other Droughts effects. In this Condition, An integrated water resource management based on awareness of spatial and temporal distribution of this type of drought will be essential. in this research, standardized water level index (SWI) and Groundwater Resource Index (GRI) have been used to assess detail of spatial and temporal of groundwater drought occurrence in Marvdasht Kharameh study areas aquifer. Thus, Groundwater level data of 67 Piezometric wells has been used for 2001 to 2011. Drought Index maps generated in Geographic Information Systems (GIS) environment with Inverse Distance Weight (IDW) method. Analysis and interpretation maps and result of calculations of two indexes reveal that the Groundwater Drought began from 2007. And three characteristics of drought include: Duration, Severity and Frerequency are increasing with increasing time scales. The spatial coverage of this type of drought gradually shifts from northern of case study to middle and finally shifts to southern part during the time study.