Based On GIS Anhui Province Geological Harzard Zoning And Assessment

Anhui province is located in the east China area in our country,the area change of relief,and various types of landforms,lithologic vulnerable parts,abundant rainfall,lead to geological disasters,such as collapse,landslide,debris flow,to the people's production and living and social economic development in the way,in order to reduce the geological disaster losses,improve the ability of disaster prevention and mitigation,It is necessary to carry out geological hazard assessment in Anhui province.Taking anhui province as the study area,anhui province geological disaster prevention and control of the database as a platform,the research area of collapse,landslide,debris flow and ground subsidence and other geological disasters as the research object,in-depth analysis of regional geological hazard development characteristics and influence factors,using GIS technology,based on the four evaluation model for the study area in the study of geologic disaster danger division and evaluation,Taking ningguo city of anhui province as the research area,this paper uses the optimal model-weight of evidence method to evaluate its geological hazard risk,and puts forward some suggestions for geological hazard prevention and control in ningguo city according to the evaluation results.The main contents and achievements of this paper are as follows:(1)Based on the investigation of geological disasters in Anhui Province,the types and development characteristics of geological disasters in the study area are analyzed in detail,and the effects of topography,hydrometeorology,lithologic structure and human engineering activities on the geological disasters in the study area are discussed.(2)the density of geological disasters,elevation,gradient,slope direction,the types of rock mass,fault distance,the distance from the river,the earthquake acceleration,the average annual rainfall,distance from road 10 factors as the evaluation of geologic disaster danger evaluation factors in the study area,the evaluation factor 10 is divided into historical factors and three types of inducing factors,basic factors,The evaluation index system was constructed,and the correlation of evaluation factors was analyzed according to Spearman correlation coefficient.(3)Based on GIS technology,the study area was divided into five risk levels,namely,low,low,medium,high and high,using four evaluation model methods,namely information content method,deterministic coefficient method,AHP-fuzzy comprehensive evaluation method and weight of evidence method,to make a zoning map of the risk level of geological hazards.The partitioning results of the four model methods were compared and analyzed,and the ROC curve was used to test the accuracy of the four model results,and the weight of evidence method was determined to be the optimal evaluation model.(4)based on the optimal evaluation model-evidence weight method,selecting the density of geological disasters,elevation,gradient,slope direction,the types of rock mass,fault distance,the distance from the river,the average annual rainfall,distance from the road 9 evaluation factor of anhui ningguo city geologic disaster danger evaluation,and geological disaster prevention Suggestions are proposed according to the evaluation results.