Aquifer remediation using nonlinear programming and positive mathematical programming in Qazvin plain

Excessive extraction of aquifers to produce agricultural products is reduced the amount of water in groundwater sources, in the manner that this amount decreasing follows irreversible effects in various areas. In order to decreasing difficulties resulting from decrease in amount of aquifer deciding in considerable level is needed. This matter has made balancing of aquifers as one of the important factors in water resources management. In this study, in order to recovery of groundwater sources and implementing extraction reduction in country's aquifers, as one of the equilibrium projects, optimization the cultivation pattern with economical approach and investigation changes farmer's profit with exploitation reduction scenarios to 1%, 3% and 5% From two popular perspectives and analytical comparisons between them is done in 1395. For optimize the cropping pattern, two perspectives of changing the cropping pattern have been used by NLP method and reduction of cultivated subspecies, and using PMP optimization method. results of using extraction reduction scenarios in Qazvin plain's aquifer, which has yearly deficiency to the value of 376 MCM showed that in the scenarios of groundwater extraction, the values of 21.2, 63.7 & 106.6 MCM of extraction are reduced from the aquifer of the case study. Also, the results of the analysis of the two planning methods showed that the NLP optimization model, gaining more economical profits than the PMP model.