Study On Landslides Susceptibility Mapping Based On Lithology Factors

For the purpose of civil construction and economic development,human beings are increasingly using and exploiting nature,the contradictions between human beings and nature are becoming more and more tense,and the probability of various natural disasters,especially geological disasters,is also increasing.Landslide disasters not only have the largest number of all geological disasters,but also cause the greatest harm to the lives and property safety of the surrounding people.In order to study the landslide phenomenon,researchers have proposed many theories and methods.Among them,landslide susceptibility evaluation is one of the important methods to investigate landslide disasters.The landslide susceptibility evaluation is based on the engineering geological analogy method.The landslide susceptibility evaluation can accurately analyze the hazards of landslides and obtain the probability of landslide disasters.It can deepen people's understanding of landslide disasters and is helpful for prevention or prevention.Reduce the occurrence of landslide disasters.With the development and spread of computer technology,more models and methods such as Support Vector Machine(SVM)models,Artificial Neural Networks(ANN),and Fuzzy Logic(FL)are applied.In the study of landslide susceptibility evaluation,surefire consequents have been acquired.This essay applies Geographic Information System(GIS),Remote Sensing(RS)and other technologies in a comprehensive way.Based on a large number of literature surveys in the area from Zigui to Badong in the Three Gorges Reservoir area,Eight basic factors such as topography,slope,aspect,slope structure,topographic curvature,stratum lithology,vegetation index,and distance from the water system were selected,and the problem of lithology factors that have not been valued in a large number of experiments in the literature is considered.Four lithological factors including permeability,weathering degree,rock mass,and the rock hardness are added in the model.The SVM was used to evaluate the landslide susceptibility of Zigui to Badong in the Three Gorges Reservoir area.The evaluation consequents of landslide susceptibility factors are contrasted,and the results demonstrated that the increase in lithological factors significantly improves the accuracy of landslide susceptibility evaluation.For the purpose of improve the exactness and dependency of the landslide susceptibility evaluation results,this article makes an innovative attempt to study the landslide susceptibility evaluation based on lithological factors.The foremost innovations are as follows:(1)Introduce the general situation of the study area and the SVM model,and use the selected 8 basic factors and 4 lithological factors to establish an evaluation mold for the arise of landslides in the Zigui-Badong section of the Three Gorges Reservoir area.This is the main tool for the evaluation and analysis of landslide susceptibility;(2)Establish comparative experiments on 4 lithological factors,and get 4 ROC curves based on different lithological factors.By comparing the ROC curves,you can analyze and judge that the lithological factors are accurate in evaluating the landslide susceptibility in the study area Degree of sexual influence;(3)According to their own features,the four lithological factors are divided into internal factor combinations and internal and external combined factor combinations,and a comparative experiment is established to define the effect of the lithological factor combination on the landslide susceptibility evaluation through the ROC curve diagram and the overall prediction accuracy analysis.(4)Combine the 4 lithological factors together to establish a comparative experiment.Determine the impact of the 4 and lithological factor combination on the landslide susceptibility evaluation through ROC curve graph and overall prediction accuracy analysis.