| Summary: | The saline water intrusion to aquifers in arid regions is one of the major challenges in the development of water resources. In this research, the risk of saline water intrusion near a salt playa in Sirjan plain was evaluated by modifying and optimizing the GALDIT model. Parameters such as aquifer type, aquifer hydraulic conductivity, groundwater level, distance to salt playa, current status of saline water intrusion and aquifer thickness were used to zoning the risk of saline water intrusion. To modify and optimize the GALDIT model, single parameter sensitivity analysis method, analytical hierarchy process and fuzzy logic were used. According to the different models results, the Sirjan plain has been classified into three saline water intrusion risk zones namely: low, moderate and high. Groundwater electrical conductivity and chloride ion concentration were employed for the validation of the results of the models. Achieving results show that the fuzzy logic is the best method for optimizing the GALDIT model. So that the correlation coefficients between the results of Fuzzy GALDIT model results and parameters of electrical conductivity and chloride ion concentration are equal to 0.88 and 0.90 respectively
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