Research On The Evaluation Of Geological Hazard Susceptibility In Neijiang City Based On GIS

In recent years,with the increase of population,the rapid development of social economy,and the expandingpeople's activities,the construction activities in mountain areas have,to varying degrees,affected the original geological environment,which has led to a variety of geological disasters.For example,the collapse of mountains,landslides,mudslides,ground subsidence in mining areas,ground fissures and so on pose a great threat to people's lives and property.TakingNeijiang city,in Sichuan province as a research area,and based on field investigation and massive collection of disaster data,this thesis establishes a set of geological disaster susceptibility evaluation index for Neijiangcity,uses the ArcGIS platform,takes advantage of the analysis method,improves binary logistic regression model and analyzes the entropy weight methodbased on the AHP-Logistic and compares the results,and finally,the evaluation results of geological disaster susceptibility in Neijiang city are obtained.The main results are as follow.(1)Based on field investigations and reference to previous research results in the field,a set of evaluation index suitable for Neijiangcityisestablished.The slope,slope direction,elevation,vegetation index,annual average rainfall,land type,riverdistance,groundwater volume,stratum lithology,earthquake point development density and the tectonic distance are selected as indicators of susceptibility.(2)The traditional binary logistic regression model is improved,and the study area is divided into grids of appropriate size.The author determines the specific disaster grid according to the location relationship between the disaster site and the grid,adopts the average value of each evaluation index in the grid and performs logistic regression.Therefore,theimpact of inaccuracies in the location of individual disaster points is avoided.(3)The analysis process,the improved binary logistic regression model and the entropy weight method based on the AHP-Logistic are used to evaluate the susceptibility of geological disasters in Neijiangcity.On the basis of the comparative analysis of the evaluation results,the entropy weight method is selected as the final evaluation model,and the zoning map of the geological catastrophes in Neijiangcity is obtainedso as to provide feasible suggestions for disaster prevention and mitigation.