Hazard Assessment Of Rainfall Landslide Based On GIS

With the constant change of geological condition,geological structure complicated and the increasing of human construction activities,such as a comprehensive variety of factors,various geological disasters occurred frequently in recent years,the people's lives and caused serious economic losses,to arouse people's attention.In the world,landslide disasters cause more than ?10 billion in annual economic losses to the human community,and China is one of the biggest casualties.China's vast,population,natural geographical conditions and geological environment is very complex,70%of the region to the mountains,so the probability of landslide,high density,disaster.The impact of landslide disasters on human society has become an important environmental problem that cannot be ignored,and its hazard has become the second nature disaster of the earthquake.This paper evaluates the risk of landslide hazard and analyzes the risk of landslide disaster,and puts it in the area of yanbian korean autonomous prefecture.Evaluation analysis process,draw on the basis of predecessors,research methods and achievements of work and combined with field investigation data,explores the geological environmental conditions and the main influence factors of landslide.Based on the analysis of the landslide factors,the author analyzes the factors of landslide in this study area to establish the index system of the landslide risk assessment.This paper selects slope,slope aspect,soil,land use type,hydrogeology,fault,river and rainfall as the factors of landslide in this study area.Rainfall is the main cause of landslides.This paper is divided into three different types of the rainfall,respectively,the average annual rainfall,the average flood season rainfall and the maximum average rainfall.The effects of rainfall factors were studied and analyzed by combining the three rainfall patterns with the other seven factors.On the basis of the above work,based on the GIS technology,make full use of the powerful spatial analysis of GIS technology and the processing ability,to each factors of landslide in layer form,with the aid of analytic hierarchy process(AHP)to determine the weight of various factors of landslide.In order to improve the accuracy of the prediction of landslide hazard in the study area,the BP artificial neural network method was introduced,and the weight of various factors of eight landslide disasters were obtained.Through the above two methods,in view of landslide disaster risk of comprehensive evaluation in the study area,and it is concluded that the landslide disaster risk zoning map,divided into the security zone,middle zone,high danger zone and high danger zone 4 area.By comparison with two kinds of methods of risk zoning map,determine the study area is more suitable for what kind of method,in order to further improve the research area of landslide disaster prevention ability and the accuracy of prediction.According to the above research results,the slope,hydrogeological and rainfall factors have great influence on the risk of landslide hazards in the study area.In the two analysis methods,the average annual rainfall is higher than that of the other seven factors.Through the comparison of two types of zoning map,and combined with relevant knowledge and research area actual situation,thought that artificial BP neural network and GIS method is more suitable for yanbian Korean autonomous prefecture area.