Reservoir Dam Surface Deformation Monitoring Based on SBAS-InSAR Technology

Periodically monitor the deformation of water conservancy projects and actively prevent the occurrence of geological disasters along the reservoir coast, which is of great significance to ensure the safety of life and property of surrounding residents and ensure the safety operation of reservoir dam. In this paper, the surface deformation of the Banqiao Reservoir is monitored by the SBAS-InSAR method based on 60 Sentinel-1A image data acquired from January 8, 2019 to November 5, 2021. The results show that the Banqiao Reservoir and its surrounding areas are generally very stable in most areas, with the deformation rate between -1mm/year and -5mm/year. The subsiding area is mainly distributed in some arable land around the village, the Ru River area and other areas, with the maximum subsidence velocity > 20mm/year. The monitoring results could provide reference for reservoir dam safety monitoring and early warning.