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.