Application Research Of Remote Sensing Data In The Risk Assessment Of Jiaodong Landsilide

Jiaodong landslide is located in the southern foot of the eastern Mountain Nianqingtanggula of the Qinghai Tibet Plateau,at the intersection of the Palongzangbu River and the Yarlung Zangbo River.The first landslide event occurred in 2000.The area is a no-man's land with remote location and poor traffic.It is difficult to carry out disaster investigation on the spot.Therefore,it is exploratory and instructive to study remote sensing technology in monitoring and evaluation of Jiaodong landslide.Based on the project of InSAR monitoring and early warning of Bayi District Natural Resources Bureau,this paper analyzes the collapse time and historical activity of Jiaodong landslide by using multi-phase optical image and sentinel-1a orbit descent data in Jiaodong landslide area,and analyzes the further development of gentle slope in this area through comprehensive research.Through comprehensive analysis,the slope area of Jiaodong landslide is divided into three areas,including two sliding areas(a,c)and one potential sliding area(b).On this basis,through the calculation equation between landslide debris flow and potential energy of rock mass,the volume scale and average thickness of the sliding mass are inversed.Through the parameters of the sliding landslide combined with remote sensing data,the risk assessment of potential landslide is carried out,and the possible disasters are analyzed.It is considered that the potential landslide area has the risk of blocking the river in the case of all landslides.The main achievements are as follows:(1)The development process and key time points of landslides are interpreted by optical remote sensing of time series,and the related parameters of landslide body are interpreted,which lays a foundation for the subsequent landslide scale analysis and hidden danger area identification.The deformation characteristics and terrain data of landslides are extracted from InSAR Data,which provides support for the identification of hidden danger areas and landslide evaluation.Combined with regional geological data and the above results,it is identified that the area B of the landslide is a potential potential area.(2)Based on the above results,the comprehensive selection of evaluation indicators,AHP,coefficient of variation and game theory are used to give index weight,and a quick evaluation formula of landslide risk is constructed in the study area.The evaluation shows that the risk level of area B is high.(3)Based on the risk analysis,the hazard analysis shows that if the hidden danger body landslide occurs,there is a risk of blocking the reservoir.The dam height after collapse is evaluated rapidly.The minimum dam height is about 32-35 m.Through this study,we explored the application of remote sensing data in the analysis and evaluation of Jiaodong landslide,and accumulated work experience for landslide evaluation under other similar working conditions.