Using the AHP and Fuzzy-AHP Decision Making Methods to Optimize the Dam Site Selection in illustrative basin in the center of Iran

Security and reduction of vulnerability of the infrastructures, as a target of conflict, disorder and terrorism have been considered by various countries since the past up to now. In this regard, the militarization of important infrastructures such as dams is not always an effective option in establishing security firstly because of high costs of security establishment and then revelation of the strategic spaces. Nowadays, planners have started to think more creatively about how they can hide security behind site selecting, planning and design features. With emphasis on passive defense concept all around the world, defining new spatial logics and including related policies in site selection incorporating the environmental issues. The importance of selected basin, as a close site to Tehran (capital of Iran) that can provide water demands for agriculture and potable usage, has made application of passive defense policies necessary. So the goal of this research is to assess the environmental impact of dam site selection with AHP and Fuzzy-AHP methods resulting from principles and policies of passive defense and to formulate appropriate framework of spatial development policy making for vulnerability reduction. In order to storage and use of water resources and reduce the environmental impacts, optimization of choosing the dam place is very important in water usage strategies and water resource management. Analytical Hierarchy Process (AHP) have possible in using the linguistic variables along quantitative variables and essentially is based on expert opinions. In recent years in order to increase the capability of AHP, this method combined with fuzzy method and in the Fuzzy-AHP algorithm is presented. In this paper, analytic hierarchy process (AHP), one of multi-criteria decision making (MCDM) techniques in fuzzy environment is applied to select the optimal alternative for construction of a dam in a case study. Results show that using AHP in the fuzzy environment improves decision making through considering more important factors in decision making.