基于GIS的灵山县地质灾害易发性分区评价研究

Evaluation of geological hazards susceptibility zoning in Lingshan County based on GIS

文章以灵山县为例,利用地质环境要素对地质灾害易发性进行评价,并通过ArcGIS软件实现可视化。选取了包括地质灾害发育密度、地貌类型、自然斜坡坡度、地形相对高差、工程地质岩组、残坡积土层厚度、人类活动强度、多年平均降雨量、地震9个影响地质灾害易发性的地质环境因素。分区结果显示,灵山县地质灾害高易发区总面积为862.03 km^2,占研究区总面积的24.22%;地质灾害中易发区总面积为336.31 km^2,占研究区总面积的9.45%;地质灾害低易发区总面积为1 360.52 km^2,占研究区总面积的38.23%;地质灾害不易发区总面积为999.72 km^2,占研究区总面积的28.10%。

Taking Lingshan County as an example, this paper evaluates the geological hazards susceptibility with geological environmental factors and realizes visualization through ArcGIS software. Nine factors of the geological hazards susceptibility were selected, including geological hazards development densities, geomorphic types, natural slope gradients, relative terrain height differences, engineering geological strata, residual slope soil layer thickness, human activity intensity, mean annual rainfall, and earthquake. The geological hazards susceptibility zoning results show that the total area of high susceptibility in Lingshan County is 862.03 km^2, accounting for 24.22% of the total area of the study area;the area of medium susceptibility is 336.31 km^2, accounting for 9.45%;the area of low susceptibility is 1 360.52 km^2, accounting for 38.23% and the area which is not prone to geological hazards is 999.72 km^2, accounting for 28.10%.