Application of SBAS-InSAR technology in monitoring of ground deformation of representative giant landslides in Jinsha river basin, Jiangda County, Tibet

Landslide is a kind of natural geological disaster with strong destructive power, long-term effective time-series deformation monitoring of landslide prone areas is an important way to prevent and mitigate disasters, and the application of time-series radar interferometry technology in geological disaster deformation monitoring such as landslide provides a new effective means for current geological disaster prevention and control. This paper uses SBAS-InSAR technology to analyze the time-series deformation characteristics of the representative giant landslides in the areas of Jinsha river basin in Jiangda country, Tibet. Firstly, based on the 23 sentinel-1A images from July 2017 to December 2018, the deformation distribution map and temporal deformation characteristics of eastern Jiangda County and its surrounding areas in the time span were obtained; on this basis, the accuracy of the deformation detection results of this paper were verified by combining the field exploration data of two paleolandslide in the region and the existing research results; finally, the deformation detection results of two landslides show that there were resurrection areas in the middle and front edge of the Woda landslide, and the deformation in some locations exceeded 100 mm, and the residual bodies in the Baige landslide also had large deformation, especially there was an obvious deformation funnel in the boundary area, and the maximum deformation exceeded 110 mm. Meanwhile, there are two potential landslide areas on the west bank of the Jinsha river basin, the cumulative settlement exceeds 45 mm, and the maximum deformation rates are −53 mm/a and −45 mm/a, respectively.Based on data analysis and field investigation, SBAS-InSAR technology provide an effective mean for monitoring and preventing the deformation of landslides geological hazards. In addition, many bank slopes of Jinsha river in Jiangda County are constantly deformed. It is necessary to strengthen the monitoring of local disaster and carry out prevention and control work in advance.