基于GIS的重庆万州区滑坡灾害危险性评价

在充分调查万州区地质环境及滑坡灾害基本特征的基础上，根据资料的有效性和可获得性，选取地表高程、坡度、地层岩性、地质构造、土地利用类型、区域交通建设及河流侵蚀冲刷7个影响滑坡发生的因素作为评价指标，采用AHP法确定各个指标权重并建立滑坡灾害危险性指数模型，通过GIS系统的空间分析功能进行栅格运算，得出研究区滑坡灾害危险性分区。采用上述指标和方法将重庆市万州区的滑坡灾害划分为极高危险区、高危险区、中危险区、低危险区和极低危险区，划分结果符合该区滑坡灾害的实际情况。

Landslide hazard evaluation of Wanzhou in Chongqing based on GIS

On the basis of surveying the geological environment and learning basic characteristic of landslides in Wanzhou region sufficiently, considering the validity of data and making sure them can be obtained, seven factors that influence the occurrence of landslides are selected as indices of evaluation, which include elevation, slope gradient, lithology, geological tectonic setting, land use, region traffic constructing and river erosion. Then Analytic Hierarchy Process (AHP) is used to fix on the weight of indices and build model of landslide hazard index. After grid data are calculated in the use of spatial analysis function of GIS, landslide hazard zoning of the study area is portrayed, and is divided into five regions as follows: extremely high-hazard, high-hazard, medium-hazard, low-hazard and very low-hazard. The result indicates that the landslide hazard zoning corresponds with the actual situation of landslides of the study area.