Modeling the effects of the Optimizing the well depth in exploitation wells of Bad-Khaled Abad plain, south of Kashan
Subject Areas :F. Shirkhani 1 , H.R. Nassery 2 * , Farshad Alijani 3 , Z. Nejat Jahromi 4
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Keywords: Optimizing the well depth, Aquifer modeling, MODFLOW, Bad-Khald Abad plain.,
Abstract :
Groundwater is the most important source of water in the Bad-Khaled Abad area of Kashan. With the increase of extraction from the Bad-Khaled Abad aquifer beyond the renewable capacity the extraction potential of this aquifer has decreased, and the optimization of the depth of the wells is necessary. Using the model, this research has investigated the effect of optimized extraction from wells and their depth on the potential of aquifer exploitation. First, quantitative and qualitative hydrogeological factors affecting the increase in the depth of the wells were identified, and then, through utilizing the Analytical Hierarchy Process (AHP) method, the weight of the layers was determined. Next, they were combined in the GIS environment and five regions with optimal conditions were proposed for well depth optimization. Afterwards, the numerical modeling including calibration, validation, and prediction steps was done using MODFLOW software. Using the created model, and implementing the optimizing depth of the wells plan in the five proposed areas in a phased manner, the effects of a 20% increase in extraction of exploitation wells were predicted by examining the changes in the aquifer water level in the next 10 years. The modeling results show an average drop of 12 and 13 meters in the southern and eastern parts of the aquifer, respectively. In this aquifer, increasing depth by more than 9 meters endangers the quality and quantity of the aquifer storage
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