Evaluation Of Landslide Disaster Susceptibility In Xinyuan County Based On RS And GIS

China is one of the countries with high incidence of geological disasters.Mountain areas are widely distributed in China,accounting for 66%of the national land area.These geomorphological characteristics provide convenient conditions for landslide geological hazards.Landslide disasters can not only cause human casualties and economic losses,but also cause damage to the natural environment.The post-disaster treatment of landslide disasters is also cumbersome and costly.Through the study of landslide geological disasters,it provides a more convenient method and scientific basis for disaster prevention,early warning and disaster treatment.Therefore,it is necessary to study the landslide geological disasters.The research area of the article is Xinyuan County,which is a tourist area in the Xinjiang Ili Kazakh Autonomous Prefecture.The county is surrounded by mountains on the south,east and north sides of the county.The terrain is complex.It is also a frequent occurrence of landslide geological disasters.Therefore,it is necessary to identify and evaluate the landslide geological disasters in Xinyuan County.The article is based on the Xinjiang Geological Hazard Information System and the Group Geographic Information Database Construction Project(Y16-1-LQ01).This article is based on the high resolution image to identify landslide disasters in Xin yuan County,and evaluate susceptibility of landslide disasters.The main research contents and conclusions of the article are as follows:(1)In this paper,the landslide hazards in Xinyuan County are identified by using high resolution images.Based on the acquired basic data and theoretical knowledge,supervised classification and object-oriented classification are used to identify the landslide geological hazards in Xinyuan County.The experiment shows that the recognition accuracy of the latter is higher than that of the former,and the results obtained are more credible.Finally,489 landslide geological hazards were identified by object-oriented method and field investigation.(2)Through the study and analysis of disaster-causing factors in Xinyuan County,seven factors are taken as landslide disaster evaluation indicators to construct a landslide disaster evaluation system.Seven factors include elevation,slope gradient,slope direction,river system distribution,stratum lithology,vegetation coverage and road distribution.Then they are superimposed with the landslide geological hazard points.The single factor evaluation and analysis of the landslide geological hazard points are carried out based on the analysis function of ARCGIS platform.(3)In this paper,AHP model and Fuzzy Comprehensive Evaluation model are used to evaluate the susceptibility of landslide hazards in Xinyuan County and to classify them into different levels.The area of the low-risk area is 6694.86 km~2,which is 67.15%of the total area of the county.The area of middle-susceptible area is 2291.11km~2,accounting for 22.98%,while that of high-susceptible area is 984.04km~2,accounting for 9.87%.Finally,according to the zoning map of landslide hazard susceptibility assessment in Xinyuan County and the actual landslide hazard points,the overlapping verification is carried out.The results show that the study area is consistent with the distribution of landslide hazards.