MONITERING EXTERNAL DISPLACEMENT OF SIX ROCKFILL DAMS BY PSINSAR ANALYSIS USING SENTINEL-1 SAR DATA

Abstract

 PSInSAR analysis was conducted using C-band Sentinel-1 SAR data for up to 5 years and 9 months from April 2017 to December 2022 for both ascending and descending orbits for six large rockfill dams, which are in the stable period and have small deformation with a maximum displacement of about 2 mm per year. The results of the PSInSAR analysis were compared with the external deformation measured by the survey conducted once every three months to evaluate the accuracy of the analysis. The results show that PSInSAR analysis can also be used for monitoring external deformation in the maintenance of rockfill dams with small displacement.