Document Type : Research Paper
Authors
University of Tabriz
Abstract
Goijeh Bel study area, located 10 km southwest of Ahar city, has unconfined aquifers in young alluviums and riverbed sediments. It includes alluvial and fractured rock aquifers in non-alluvial lithological units with secondary porosity. Springs in Goijeh Bel basin primarily emerge from fractured rock, with a concentration in the central and northern parts of the basin, indicating the presence of developed aquifers in these areas. Due to overexploitation and depletion of alluvial resources, the focus has shifted towards utilizing fractured rock water sources in the GoijehBel basin. With a significant percentage of outcrops consisting of igneous, metamorphic, and sedimentary formations, along with adequate rainfall (342.2 mm annually), the basin has the potential for groundwater storage and movement through fractured media. To determine the potential of groundwater resources, various information layers such as lithology, line density, elevation difference, humidity index, slope, watercourse density, slope direction, and vegetation index were utilized to create zoning maps. AHP, weighted overlay, and OWA methods were employed to analyze the degree of overlay and generate potential maps. According to the zoning map, the southwestern part of the basin has a high potential for groundwater resources. Examining the relationship between the number of springs and wells and areas with the potential of different water resources and the compliance of about 50% of the springs showed that the potential map with the OWA method has the most conformity with the location of the springs. Also, the quality of the groundwater resources of the area has been investigated and the results showed an increase in salinity from the heights towards the center and outlet of the basin. The EC value varies from 310 to 1444 ms/cm. Groundwater in the area have good quality for drinking due to the absence of saline formations like salt, clay, and marl units
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