RESEARCH ON GEOLOGICAL HAZARD SUSCEPTIBILITY IN MOUNTAIN AREA-A CASE OF STUDY IN CHENGKOU COUNTY, CHONGQING

The study area is Chengkou County in Chongqing. The main goal of this paper is to carry out study of geological hazard susceptibility on the basis of logistic regression model and geospatial database in mountain area. The process contains three major phases. Firstly, thirteen factors were selected as impact factor in total based on geospatial data.they were slope angle, slop aspect, curvature, micro-landform, slope position, distance from drainage, lithology, distance from faults, distance from highway, elevation, normalized difference vegetation index(NDVI), consequent-reverse slop and mean annual precipitation. Secondly, rasterizing every layer on the basis of GIS technology and establishing geospatial database. Thirdly, Sample training was accomplished by R software, the value of regression coefficients was determined as well as geological hazard susceptibility map could be obtained. Meanwhile, the susceptibility can be divided into five grades: very low, low, medium, high and very high. At last, the evaluation result was tested by ROC curve, the value of AUC is 0.901 which indicates logistic regression model is highly available to study of geological hazard susceptibility in Chengkou County.