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Existing urban disaster risk assessment methods didn’t consider the hazard, vulnerability, capacity synthetically, as well as the typical characteristics of city facing disasters. So they were difficult to meet the needs of emergency preparedness, mitigation and response of the city specific disasters. This paper, taking Changsha City, Hunan Province, China as an example, analyzes disaster risk features of the city taking history disasters, population, economy and social development into consideration from Hazard, Vulnerability and Capacity. And then a model, geospatial visual urban disaster comprehensive risk assessment based on GIS, is established, in which the indicator weights are calculated using an improved gray correlation method. A regionalized disaster risk map of Changsha City is acquired, which can be used for comprehensive emergency management of the city.

Urban Disaster Comprehensive Risk Assessment Research Based on GIS: A Case Study of Changsha City, Hunan Province, China