Application of Multi Objective Optimization Method AMALGAM in Determining the Policy of Optimum Discharge from Groundwater Resources Using Mathematical Model

Due to existence of drought periods, decreasing the discharge of the aqueducts and springs and also growing usage of water in study area, administrative sections are eager to do pumping from the groundwater aquifer so aquifer operation management can have an important role in preventing the adverse decrease in water table in this aquifer and creating the Irreparable disaster for attaining this necessity simulator-optimizer model of groundwater was offered. Offered model is a combination of aquifer simulating model (MODFLOW2005-NWT) and multi-objective optimizing algorithm (AMALGAM) in MATLAB programming. For determining the aquifer hydrodynamics parameters, this model was validated and calibrated. The objectives of this model were minimizing the three functions of shortage affected by the failure to supply the necessity, decreasing the water table and Modified Shortage Index (MSI). The presented model was run for a year period with 12 monthly Stress period and Optimal Pareto Front was determined. As one of pareto optimum calculated answers, it can be viewed that when water table remains unchanged, 14.4 million cubic meters of demands exhibit shortage and the amount of MSI will be 3.95. In order to specifying the best option of policy discharge, according to economic, social criteria and environmental effects by administrators and relevant policies, the appropriate optimum answer should been defined among the other optimum and selected pareto answers and also among the discharge amounts corresponding chosen answer. By analyzing the results of using the recommended structure, it can be found that the presented approach has good performance in determining the aquifer optimum policy.