Investigation And Susceptibility Evaluation Of Geological Disasters Based On InSAR Technology

The complicated geological environment in China leads to frequent geological disasters,which seriously restricts the sustainable development of local economy.Therefore,the investigation of regional geological disasters and the assessment of their susceptibility play an important role in regional disaster prevention and mitigation and economic development.This paper takes the Xianglushan area as the research object,and mainly uses the combination of optical remote sensing and InSAR technology on the basis of Landsat8 remote sensing images,Sentinel satellite data and field surveys to identify the geological disaster points or hidden danger areas in the area.In addition,the evaluation model of geological disaster susceptibility in the study area is established,and the evaluation zoning of geological disaster susceptibility in the study area is carried out by using the weighted information method.The research contents of this paper are as follows:(1)Through the processing of image data,the environment of disaster-prone bodies based on topography,lithology and geological structure is visually interpreted and verified in the field.On this basis,a three-dimensional geographic information model of the study area is established with the help of software to remotely interpret the geological disaster points in the area.And analyze the interpretation results,and preliminarily determine the main factors that affect the occurrence of geological disasters in the region.(2)Using D-InSAR technology and Stacking InSAR technology to process the radar data of Sentinel satellites,obtain the annual average deformation rate of the radar line-of-sight upward for the orbit-raising and descending data of Xianglushan area.Hidden areas of geological disasters.Analyze the hidden danger areas of geological disasters,and further confirm the evaluation factors that affect the occurrence of geological disasters.(3)Establish a geological disaster susceptibility evaluation model in the study area,and finally select 8 influencing factors of elevation,slope,slope aspect,stratum,surface relief,distance from water system,distance from fault and vegetation coverage to analyze geological information through spectral information.The hidden danger areas of geological disasters delineated by disaster points and deformation data are dangerous areas,and the weighted information method is used to classify the susceptibility of geological disasters in Xianglushan area.(4)According to the results of the study,it is found that the probability of geological hazards in the area is higher in the range of elevation values from 2340 m to 2585 m,slopes from 14° to 21°,slope directions from 202.5° to 337.5° and surface undulations from 15 m to 32 m.Finally,the Xianglushan area is divided into high,medium and low vulnerability zones according to the vulnerability of geological hazards,and their areas account for48.70%,34.62% and 16.68% respectively.