Phisical Vulnerability assessment of Urban Areas: a Passive Defense Approach Case Study: Shiraz, Iran

Today, application of passive defense principles in urban planning with the objective of minimizing man-made threats is important. Therefore, to risk management preparedness, the evaluation of the urban phisical’ vulnerability and identification of the valnerable areas are needed. To this end, the main goals of this paper are i) determining the importance of each criteria that affects on the vulnerability level; ii) evaluation of vulnerability levels in Shiraz metropolitan areas based on these criteria; iii) identification of the valnerable districts under probably manmade threats. methodology type of current research was a descriptive-analytical and applied in the case study. In order to identify the vulnerable areas in Shiraz, combined model was utilized, which was comprised Of Fuzzy Analytic Hierarchy Process and Ordered Weighted Averaging with geographical information system capabilities. The criteria used in this paper were extracted from the theoretical reviews and then, the FAHP method were applied to determining the importance of each criteria. The fuzzy criteria maps were generated using fuzzy membership functions in GIS at city block level. next, fuzzy maps were overlaid using fuzzy Weighted Linear Combination(WLC) function. The OWA method was applied to generate city-scale vulnerability final maps at five risk levels. The results of the present study indicated that in high risk-taking condition (Degree of Orness=1), 27% of the urban blocks in Shiraz were at very high vulnerability conditions that include districts number of 8 and 2 and parts of the 1, 5, 12 and 4; on the other hand, 65% of the urban blocks in this city were in the middle vulnerability conditions.