摘要
基于GIS平台,选取坡度、岩性、河流距离、曲率共4个地质灾害致灾因子,采用多因子综合分析方法,对嘉陵江流域北碚段进行地质灾害易发性分区。按照地质灾害的易发性分级,将2343.6 km2范围的研究区划为4类,其中低易发区面积为141.82 km2,中易发区面积为1162.47 km2,高易发区面积为914.95 km2,极高易发区面积为124.38 km2。最后应用野外地质灾害调查结果对分区结果进行验证,位于极高易发区与高易发区的灾害点分别占全部灾点的59.7%与28.2%,共为87.9%,且几处大型的滑坡、堆积体、危险库岸都位于极高易发区,表明研究成果比较客观。
This paper presents a GIS-based method for geological hazards susceptibility at a regional scale. Most of the input data for the susceptibility assessment have been captured automatically. A total of 4 parameters, related to the slope degree and curvature, have been derived from the DEM , and the lithology and river network are derived from 1 ： 500000 geological maps. The result of susceptibility of geological hazards is divided into four types, which are extreme high susceptibility, high susceptibility, mid-susceptibility and low susceptibility. The susceptibility map is obtained by multivariate analysis method. The results of the susceptibility map have been checked with landslides by field investigation.
出处
《地质灾害与环境保护》
2009年第3期45-49,共5页
Journal of Geological Hazards and Environment Preservation
关键词
地质灾害
易发性区划
GIS
geological hazards
susceptibility mapping
geographic information system
