基于GIS的江苏宜兴市地质灾害易发区评价

宜兴市地质环境条件复杂,人类工程活动强烈,地质灾害发育、危害严重。本文通过对宜兴市地质灾害发育现状、形成条件及影响因素分析,选取了评价因子,在网格剖分的基础上,采用加权指数模型,分别计算出每个单元的滑坡和崩塌、岩溶地面塌陷、采空地面塌陷的易发程度指数,然后利用MapGIS的空间分析功能进行叠加,得到宜兴市的地质灾害易发程度综合指数分区图,划分出地质灾害高、中、低和不易发区,为科学地开展地质灾害防治提供了依据。

Geological hazards easy-happening zoning evaluation of Yixing city by applying GIS

The geological environment condition of Yixing city is very complicated,human engineering activities is intensive,the geological hazard is easy-happen and damage is serious.The paper analyzed the distribution situation,forming condition and influencing factors of geological hazard,chosen the evaluation factors,based on mesh division,adopted weighted index model,calculated the each mesh’s easy-happening index of landslide and collapse,karst ground collapse,mining ground collapse,then superposed the three coverage by using the spatial analysis function of MAPGIS,obtained the dividing zone of easy-happening degree comprehensive degree in Yixing city,divided into the high,medium,low easy-happening area and non easy-happening area,provided the scientific basis for the geological hazard prevention and administration.