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

摘要： 为了开发高效、先进的堆石坝正常运行工况下和遭遇地震后的变形监测方法，对基于卫星合成孔径雷达（SAR）数据的监测方法进行研究。卫星SAR不需要在坝面上安装任何传感器，可以对堆石坝的整个表面进行观测，且无论天气状况如何都能够获得数据，可用于堆石坝变形监测。利用卫星SAR数据对某堆石坝近4年来的外部变形进行了评价。该坝坝顶有3个观测点，对使用卫星SAR数据得到的外部变形结果和各测点观测成果进行对比，结果表明使用卫星SAR数据得到的外部变形结果与实际调查结果吻合，外部变形平均误差约为几毫米。此外，利用卫星SAR数据研究了2016年熊本地震对堆石坝的损伤，表明卫星SAR数据可以探测地震作用下堆石坝的小变形。

关键词: 卫星合成孔径雷达数据, 堆石坝, 变形监测, 地震