Identification of Key Centers of Vulnerability in the City of Hamedan Against Floods Using GIS Software and River Modeling HEC_RAS

Urban floods have been exacerbated by climate change, urbanization, and limited drainage of urban infrastructure. Over the past decades, they had many negative effects, including the vulnerability of key centers. The vulnerability of key urban centers through man-made hazards and natural disasters causes their inefficiency, intensifies public dissatisfaction and lack of service in accidents. In order to make key centers resilient, it is necessary to identify important centers and examine their vulnerability to various hazards and threats. Criteria and sub-criteria for grading and evaluation of assets were weighted by AHP technique in Expert Choice software and then the key centers of the city were identified. Intra-Urban and extra-Urban hydrology and modeling of rivers in Hamadan in different return periods were studied by using HEC-RAS software. Next, the results were transferred to GIS and flood risk zoning of Hamadan was determined. After entering the average sample comments in Expert Choice software, the weight of each index was determined separately, which shows that the quantitative level of utilization index has the highest weight and the economic value of the asset has the lowest weight. Finally, with the adaptation of key centers and flood risk zones in GIS, vulnerable centers were identified.