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Monitoring of Surface Deformation of Transmission Tower Based on SBAS-InSAR Technology

As an essential part of transmission lines, some transmission towers have to be built on mountains, hills, and other areas prone to surface deformation. Geological hazards caused by surface deformation will threaten the stability of transmission towers and thereby threat the safety of power transmission. This paper focuses on the ground surface deformation problems in the area around the transmission towers in Lincang city. It uses SBAS-InSAR technology to process 70 scenes Sentinel-IA data from January 7, 2019, to May 8, 2021. The results contain the average deformation velocity maps and deformation time series of the surface around the transmission tower during the monitoring period. The consistencies conducted from the SBAS-InSAR results and the optical images prove the reliability of the SBAS-InSAR monitoring results. Based on the SBAS-InSAR monitoring results, the cumulative deformation of the foundation surface of six transmission towers reached 40mm with different deformation processes, posing a threat to the safe operation of the electric power grid. In conclusion, the research results of this paper provide a reference for geological hazard warnings and site selection of transmission towers.