星载InSAR技术在库岸边坡稳定性识别与监测中的应用

Landslide monitoring based on space-borne InSAR technique in reservoir districts

为解决大型水库两岸边坡稳定性识别与监测存在区域面积大、人员难以到达、常规监测成本高等问题,将星载合成孔径雷达干涉技术(InSAR)用于库岸边坡稳定性识别与监测。研究了InSAR变形识别与时序InSAR变形监测的理论与方法,分别通过升轨和降轨SAR影像,对金沙江某在建电站库区的边坡稳定性进行InSAR变形识别,发现大型滑坡3处,与现场地质勘查结果吻合;对No.21滑坡体的时序InSAR变形监测结果表明,该滑坡体持续变形,且在上游白格滑坡堰塞湖溃决冲刷下,滑动速率明显增大。

In order to overcome the disadvantages of slope stability identification and monitoring in large reservoir, such as too large area, difficult to reach and high cost of conventional monitoring, space-borne synthetic aperture radar interferometry(InSAR) is used to identify and monitor the slope stability of reservoir banks. This paper studies the theory and method of InSAR and MT-InSAR for deformation recognition and monitoring. Based on both ascending and descending SAR images, the slope stability of a hydropower station under construction in Jinsha River is identified by InSAR. Three large-scale landslides are found, and the results are consistent with that of the geological survey. The MT-InSAR deformation monitoring results of No.21 landslide show that the landslide body is continuously moving, and the deformation velocity is enlarged due to the erode of the upstream Baige dammed lake.