RISK ASSESSMENT OF GEOLOGICAL DISASTERS IN MOUNTAINOUS AREAS EAST OF BEIJING
The Risk assessment of geological disaster susceptibility is one of the important processes of geological disaster risk management.In the eastern Beijing,for example,select the normalized vegetation(NDVI),undulation,slope,rainfall,aspect,road distance,fault distance,engineering geological rock group 8 factors,based on information and PCA weighted information method for regional prediction of slope geological disaster,and use the geographical detector to evaluate the interpretation of geological disaster prone.The results show that the high risk area of geological disasters is mainly distributed in the northeast,and the low danger area is distributed in the western valley and the southwest plain area.Both evaluation methods can predict the risk of the research area well,and the general information method has higher accuracy,but the PCA is more reasonable in the plain area.The results of geographic detector show that the explanatory power of road distance is 54.8％;the explanatory power of PCA weighted evaluation results of topographic relief,rainfall and engineering geological rock groups is 55.8％,32.6％and 28％respectively,while other factors are small.The evaluation results can provide reference for emergency management and disaster prevention and mitigation in the study area.
information value modelprincipal component analysisgeological disastergeographic detector
NETL
NSTL
万方数据
