Investigating the vulnerability of Khanj plain aquifer- Larestan fissure using drastic model

Groundwater is the second largest source of fresh water in the world. About a third of the world's population depends on this resource. Existence of important sources of diffuse and point pollutants, due to human activities on the ground and the penetration of these pollutants into the aquifer, reduces the quality of groundwater. Vulnerability assessment is a low-cost method in identifying areas prone to pollution that plays a key role in the management of water resources. It is a suitable management tool to prevent groundwater pollution. For this research, the hydrogeological parameters of the drastic model include water depth, net nutrition, aquifer environment, soil environment, topography, effects of unsaturated area and hydraulic conductance, stinging pain. Larestan fissure, located in the south of Fars province, was studied. Arc GIS software was used to prepare vulnerability maps by overlapping hydrogeological layers. According to the findings of this study, the groundwater of the study plain is at high risk of contamination, so that about 62% of the area is in moderate to high vulnerability. These areas are generally located downstream and in the center of the plain. Considering that groundwater is the most important water source in the region, prevention of pollutants entering groundwater by creating quality protection zones around water sources and observing the rules of discharging pollutants to receiving sources, is an effective solution. To maintain the quality of these resources. Important management tools such as vulnerability maps and quality privacy are important for planning for proper deployment of land uses and their management on the aquifer.