关键词: 卫星合成孔径雷达数据, 堆石坝, 变形监测, 地震

Abstract: For development of efficient and advanced deformation monitoring methods for rockfill dams in normal times and after earthquakes, we studied monitoring methods using satellite SAR (Synthetic Aperture Radar) data. Because satellite SAR doesn't need any sensors on dam surfaces and it can observe entire surface of rockfill dams and obtain data regardless of weather conditions, it is expected to contribute in monitoring of deformation of rockfill dams. In this paper, we evaluate external deformation of a rockfill dam using satellite SAR data in about four years. The dam has three targets on the cret for survey and we compared the results of external deformations by satellite SAR and survey at the points. We found the results of external deformations using satellite SAR data agreed well with those by survey and the average error of the external deformations between SAR and survey was abot several millimeters. We also investigated tendency of external deformations of dam surface where survey had not been conducted. In addition, we conducted studies of deformation monitoring after earthquakes using satellite
SAR data to grasp damage on rockfill dams by 2016 Kumamoto earthquake. We found satellite SAR data could detect small deformation of rockfill dams by the earthquake.

Key words: satellite SAR data, rockfill dam, deformation monitoring, earthquake