Risk assessment of debris flow disaster: a case study of Wudu District in the south of Gansu Province, China
(2.Gansu Institute of Land Resources Planning and Research, Lanzhou 73000, China 730000)
(3.School of Civil and Construction, Three Gorges University, Yichang, China 443000)
【Abstract】Taking Wudu District in the south of Gansu Province as research object, and selecting 25 villages and towns in the district as assessment unit, the regional risk assessment was carried out by using regional hazard and vulnerability as basic assessment indices. The regional hazard was integrated through historical disaster data and field investigation data. At the same time, information method was adopted and 250 m × 250 m basic grid was selected as assessment unit, and then the hazard was obtained. Taking the exposure, the sensitivity and the recovery ability of hazard-affected body into account, with the help of DEA model and C-D function, the vulnerability values of villages and towns in Wudu District were calculated, and then the vulnerability subregion of villages and towns in research region was obtained. Hazard and vulnerability were coupled, and the regional risk coefficient was introduced, and then the risk assessment model was established, based on the risk rank and the risk zoning map of Wudu district which were obtained by using GIS technology. Meanwhile, some suggestions were proposed for disaster prevention and mitigation. The results show that the extremely high risk areas in Wudu district were mainly distributed in the Chengguan Town, Dongjiang Town, Majie Town, Bolin Village, Anhua Town and most parts of Hanwang Town.
【Keywords】 debris flow; hazard; GIS; vulnerability; risk assessment;
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