Research on deformation zoning and time-series monitoring of large-scale landslide based on SBAS-InSAR

To analyze the deformation zoning of large-scale landslides in the Three Gorges Reservoir area, based on the Sentinel-1A data of 29 scenes from January to December of 2021 and used the Small Baseline Subsets Interferometric Synthetic Aperture Radar(SBAS-InSAR) technology, the deformation zoning and time-series monitoring of the Shizhuan-Quntuozi landslide were studied.The interpretation results revealed that compared with GPS monitoring data, the accuracy of SBAS-InSAR results was verified.The creep behavior showed noticeable temporal-spatial differences: the deformation area was mainly concentrated in the area without treatment engineering, and a new deformation area appeared on the northern boundary of the landslide due to ground levelling.There were differences in the main control factors of landslides in different regions, such as the factors in the front area were the fluctuation of the reservoir water level, and the middle area of the landslide was affected by the reservoir water level and heavy rainfall.The results reveal that the SBAS-InSAR technology can monitor large-scale landslides in time series and provide reference for disaster prevention and reduction.