基于GIS的陕西省安康市地质灾害易发性分区

GIS-based zoning of geological hazard’s susceptibility in Ankang city of Shaanxi province

在对陕西省安康市地质灾害调查的基础上,通过选择年降雨量、坡度、海拔高程、灾害点密度、土壤类型、人类工程活动等因素,建立了评价指标体系。采用基于GIS的信息量分析模型对安康市地质灾害易发性进行了分区,将研究区划分为地质灾害高易发区、中易发区、低易发区、不易发区。其中,高易发区面积6 135 km^2,占全区总面积的26.52%;中易发区面积8 096 km^2,占全区总面积的35.01%;低易发区面积6 488 km^2,占全区总面积的28.05%;不易发区面积2 411 km^2,占全区总面积的10.42%。

Based on the survey of geography disasters in Ankang city of Shaanxi province, an evaluation index system by choosing annual precipitation, slope, elevation, point density of disasters, soil type and human engineering activities was established. Adopting information analyzing model of GIS, the susceptibility zones of geography disasters in Ankang ctiy was made. The results show that Ankang ctiy could be divide into four geological hazard zones, including high-incidence zone,middle-incidence zone, low-incidence zone and nonoccurrence zone. Among the zones, the area of high-incidence zone is 6 135 km^2, covering 26.52% of the total area;the area of middle-incidence zone is 8 096 km^2, covering 35.01% of the total area;the area of low-incidence zone is 6 488 km^2, covering 28.05% of the total area;the area of nonoccurrence zone is 2 411 km^2, covering 10.42% of the total area.