Document Type : Original Research Paper
Authors
1 Ph.D Student, Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
2 Associated Professor, Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
3 Professor, Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
Abstract
Estimation recharge is an important parameter in the hydrogeological study that used for water budget. Recharge potential map prepared based on spatial maps of eight major influencing factors on groundwater recharge rates (lithology, slope value, aspect, drainage density, precipitation, fracture density, karstification and epikarst) were integrated using GIS after expertise judgment. The study area has been classified into four zones with potential recharge of 15, 25, 35 and 45 percent. The extent of each zone was determined 251, 879, 943 and 200 km2, respectively. The average potential recharge was 30% in the study area. According to potential recharge and average of annual precipitation (164 mm), the total recharge in the Shotori mountains was estimated to be 122 million cubic meters (MCM) and about 25 MCM from that volume were discharged from springs and abstraction wells and remaining volume (87 MCM) is recharging to adjacent aquifers. Ezmigan, Ganbar, and Korit are the major karstic springs that drain the Shotori Mountain with the mean discharge rate of 63, 60 and 24 lit/s and electrical conductivity values of 601, 1640 and 825 µS/cm respectively. The estimated catchment area based on the recharge rate in comparison to the evaluated catchments by geological, stratigraphical methods showed that the difference is less than 15%, which confirms the estimated amount of recharge.
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