Analysis of geological hazard susceptibility in Xundian County based on the comparison of multiple models
In order to reduce the frequency of geological disasters in Xundian County,taking the slope geologi-cal disasters such as landslides,collapses and debris flows in Xundian County as the research object,using the evidence right method,the combined weighting method and the coupling of the two methods,based on the GIS platform and SPSS 26.0 software,seven evidence factors/inducing factors such as elevation,slope and land use were selected to evaluate the susceptibility of the study area,and four susceptibility areas were divided:low,low,medium and high.The results show that:(1)The geological characteristics of the high,medium and high susceptibility zones are consistent with the influencing factors of geological disasters obtained from the study,and the prediction results are consistent with the spatial distribution characteristics of geological disasters.(2)The proportion of disaster points in the high and middle high sub-districts was 83.33%,84.68%and 85.14%,respectively.(3)The accuracy of the three models is more than 70%,among which the accuracy of the area under the line(AUC)of the characteristic curve(ROC)of the coupled model is the largest,which is 0.801,followed by the evidence weight method(0.758),and the combination weighting method is the third,which is 0.752.Comparatively speaking,the coupled model of evidence weight-combination weighting is more suitable for geologi-cal disaster risk assessment,which provides a scientific basis for disaster prevention and mitigation and geological disaster prevention in Xundian County.
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