基于GIS的江苏宜兴市地质灾害易发区评价

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

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。

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.