基于GIS的南通市自然灾害风险区划

GIS-Based Natural Hazard Regionalization in Nantong

本文从自然致灾因子危险性和承灾体易损性2个方面选取评价指标,在南通市基础图件的基础上,通过GIS软件分析分别得到南通市自然致灾因子危险性分区图和社会经济易损性分区图。两图叠加后,生成南通市自然灾害风险区划基本单元,采用自下而上的定量区划方法,合并得到自然灾害风险区划图,最后分别论述了每个风险区的自然灾害和社会经济的特征。通过对风险区划指标和区域划分的探讨,以期为南通市防灾减灾工作提供科学依据。

<Abstrcat> By selecting assessment indices from hazard property of natural disaster-causing factors and vulnerability of natural disaster bodies, and based on the basic maps of Nantong city, the map of natural hazards and the map of vulnerability of social economy are produced by using geographical information system analyzing. The basic units of natural disaster risk regionalization also can be produced by overlaying two maps produced. Adopting the bottom-up regionalization method and combining the basic units from bottom to up, the map of natural disaster risk regionalization and three risk regions can be obtained. The natural hazards and socio-economic characteristics of every risk regions are discussed in details also. The discussion on risk assessment indices and risk regionalization are intended to provide scientific basis of hazard prevention and reduction for Nantong city.