Application of PSInSAR Analysis Using Sentinel-1 SAR Data to Measure External Deformation of Rockfill Dam for Maintenance Management

A PSInSAR analysis utilizing Sentinel-1 SAR data was conducted for a rockfill dam, which is already in the stabilization phase but has been deformed by up to about 10 mm per year for the past several years and for which external deformation is continuously measured, to verify the accuracy of the displacement that can be determined from satellite SAR data by comparing the analysis results with survey data. The PSInSAR analysis provides many PS points on the entire outer surface of the rockfill dam. It verifies that the displacement of PS points can be measured accurately on the order of mm using Senttenel-1 SAR data, indicating that satellite SAR data can be used to manage the rockfill dams.