Evaluation of Urban Outdoor and its Role in Reducing Vulnerability in Crisis with Passive Defense Approach (Case Study: Tabriz City)

Since the beginning of human being creation and beginning to live in this world, man has faced the threat of terrorism and has always tried to balance security threats and human needs. In this context, passive defense is one of the most effective and lasting means of defending against threats from a long history of human. One of the solutions has proposed to reduce injuries in the threat situations is the use of open spaces . Therefore, the purpose of the research is to evaluate urban open spaces and its role in reducing vulnerability during crisis with the passive defense approach in Tabriz . The present research is descriptive-analytical and with applied approach. Sampling were selected from 100 residents of Tabriz decuple regions from questioning surveys. The data were analyzed using ARC GIS software and multi-criteria decision making methods, MCDM and fuzzy analysis. The results showed that among the weight of sub-criteria, outdoor space has the highest weight with 0.621 value and the lowest weight was assigned to the sub-criterion of relative self-sufficiency 0.023 and according to the final map of fuzzy overly map, the area of open space in reducing the vulnerability of 10 regions was 4253469 m2 with the lowest area 5.55 percent and highest area 19.39% Equal to 14849144 m2 and has the most favorable open spaces in decreasing vulnerability, and in the among of 10 regions of Tabriz, region of 5,6,7, and 9 have an important role in decreasing of vulnerability and region of 1,2,4, 8,9 and 10 have the less effect in decreasing vulnerability.