The Risk Evaluation On The Geological Hazards In He Yang County

Heyang County locate in eastern of Shaanxi Province,Wei nan City,where belongs to loess Taiwan plateau area.The distribution of loess in the territory is wide,the gully aspect,the slope of the slope is large,the platform plateland is scattered,and the impact of human engineering activities,resulting in poor geological conditions in the area,resulting in landslide,collapse,ground subsidence geological disasters occur,serious To threaten the lives of local residents and property security,restricting the long-term development of the local economy.At present,the research on regional geological hazard risk evaluation is still in the exploratory stage,especially for vulnerability assessment is no mature theory system and method.This paper research on the detailed investigation of heyang geological hazard in shaanxi project,heyang as the research object,through field geological disasters of the actual survey results and collect related data,preliminarily summarized the geological environment background of the research region,and analyzed the development characteristic and distribution of geological disasters in the study area.Through to the domestic and foreign about the geological disaster risk assessment methods and results of in-depth study,based on the results of heyang 1:50000 geological disasters detailed investigation by using analytic hierarchy process and fuzzy comprehensive evaluation method,through the space of Arc GIS overlay function,it is concluded that risk assessment results in the study area.The following results were obtained:??Risk assessment: through the study of geological disasters in the study area of development,it is concluded that the formation of geological disasters in the study area and the inducing factors of seven major indicators,using the analytic hierarchy process to draw seven weights of evaluation indexes,through the Arc GIS will each index quantification and normalization,the indicators to make use of raster calculator superposition calculation,finally the study area is divided into high,medium,low,very low four grades.??Vulnerability assessment: according to the characteristics of the bearing in the study area,it is concluded that the study area of vulnerability of three evaluation indexes,the villages and township in heyang as evaluation unit,combined with the township of information collection,using the fuzzy comprehensive evaluation method to evaluate each township of vulnerability,the study area is divided into high,medium,low,very low four grades.??Risk assessment: the vulnerability assessment of four level assignment,transformedinto grid,using raster calculator will risk assessment and vulnerability assessment multiplication,the risk assessment results: high risk,medium risk,low risk,low risk.The area of each partition is counted and some Suggestions are put forward.