The Risk Evaluation On The Geological Hazards In Zhou Zhi County

Zhouzhi County locate in the junction of Qinling Mountains Longsheng platform and Weihe fault basin,The deformation of the fold is strong,the fracture is more developed,the rock mass is broken,the water system is dense,the geological environment is fragile,and the high strength human engineering activities,under the action of rainfall,cause a lot of geological disasters,causing serious casualties and economic property losses?In this paper,Zhouzhi County as the research object,based on the relevant regional geological environment data collected from the field survey,through the study and comparison of various evaluation methods and research results about the risk assessment of geological hazards worldwide,and the combination of analytic hierarchy process(AHP)and fuzzy comprehensive evaluation method,and the aid of ARCGIS 3D Analyst tool is applied to risk assessment in Zhouzhi County.The following conclusions are drawn in this paper.1?On the basis of field investigation and data collection,the characteristics of geological disasters in Zhouzhi County are analyzed in depth.The geological structure of Zhouzhi County is complex and the terrain difference is remarkable.The influence of erosion and cutting on the mesa of the northern loess tableland area is relatively broken and steep,providing terrain conditions for the occurrence of landslides and collapse disasters.In the southern Qinling Mountains erosion mountain area,the terrain is broken,the undulating degree is large,and the ravines are vertical and horizontal.Topographic conditions are provided for the development of debris flow.2?The analysis uses AHP to Zhouzhi County,slope height,slope type,slope direction,precipitation,soil type,disaster point density,human engineering activities,seven indexes,the weights are normalized and then analysis the overlay analysis is divided into high,medium and low,very low four grades.The fuzzy comprehensive evaluation method is applied to evaluate the vulnerability of GDP,population,cultivated land and highways in Zhouzhi County.The vulnerability level is divided into four levels: high,medium,low and extremely low.3?According to the risk of empirical formula = dangerous * vulnerability,using the Raster Calculator tool of ARCGIS to analyze the spatial overlay and divide Zhouzhi County into high risk area,middle risk area,low risk area and extremely low risk area.some Suggestions are put forward.