Application of Fuzzy Logic in Site Selection of Artificial Groundwater Recharge Using Integrated Method of AHP and FTOPSIS

In recent decades, duo to increase in population, demand for reliable water supplies has increased. The situation is critical in places where groundwater is the only accessible water resource and the discharge rate of water is more than the rate of recharge. In such areas, artificial recharge of groundwater is an important management strategy. In establishing an artificial recharge scheme, site Selection is the prime prerequisite and its success depends on the collection and analysis of a great deal of geographic data. The use of fuzzy set theory in site selection projects allows the decision-makers to incorporate unquantifiable information into decision model. In new researches of site selection fuzzy multiple criteria decision making methods have been considered. In this paper, site selection of artificial groundwater recharges using an integrated method of Fuzzy TOPSIS and AHP has been carried out by raster layers in GIS. Figure 1 presents the structure of the proposed method. As it can be seen in this figure, after determining the criteria and forming hierarchy, decision weight of each criterion is achieved by paired comparisons. For each class, by establishing the decision matrix, using fuzzy numbers and calculating distance from the positive and negative ideal class, matrixes of distance to negative and positive ideal solution are created. Thereafter, thematic layers of distance from negative and positive ideal class are created for each criterion. By integrating this layers and multiplying results by constraint layer final layer is achieved.