Comprehensive Evaluation of Large-scale Geological Disaster Susceptibility Based on Frequency Ratio-Hierarchical Analysis Model:Taking Yuyang River Basin as an Example
The investigation and evaluation of regional large-scale geological disasters has the characteristics of few geo-logical disaster points and various types of disasters,which puts forward higher requirements for the susceptibility evalua-tion of geological disasters.Taking Yuyang River Basin as the study area,and based on the frequency ratio-hierarchical analysis(FR-AHP)model,six factors of engineering geological rock group,slope structure,distance from fault,height difference,slope and distance from water system are selected to establish the evaluation index system of landslide and col-lapse susceptibility.The AUC values of the evaluation results are 0.871 and 0.926,respectively.The susceptibility of landslides and collapses are classified into four levels,namely,high,medium,low,and non-high respectively,and the spa-tial superposition is carried out by using the principle of high.The results show that the area of high susceptibility area in Yuyang River Basin accounts for 13.6%of the study area,which is mainly located in the surrounding area of Yuyang-guan Town in the upper reaches and Wangjiafan-Zhangguiling and Zhangjiajian-Tuoxi areas in the middle reaches.By comparing the susceptibility evaluation results of geological disaster classification FR-AHP model and unclassified infor-mation model,it shows that the set of technical methods is well applied in the evaluation of the susceptibility of large-scale geological disasters,and has certain application and promotion value.
geological disasterssusceptibility assessmentfrequency ratiohierarchical analysisYuyang River Basin
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