时间序列SAR影像监测堤坝形变研究

Monitoring Levee Deformation with Repeat-Track Space-Borne SAR Images

结合时间序列InSAR技术,在无先验形变模型的情况下,研究了中分辨率Envisat ASAR数据在堤坝监测中的应用。首次使用24景Envisat ASAR影像得到了上海市长江口南岸和杭州湾北侧堤坝的沉降速率。实验结果表明,堤坝存在着不均匀沉降,其中位于浦东机场堤坝和临港新城堤坝的沉降最为严重。利用水准数据对临港新城堤坝的监测结果进行了验证,监测精度达到了mm级,证明了时间序列SAR影像在堤坝形变监测上的有效性和应用潜力。

Levees are constructed to protect coastal cities from typhoon, flood and sea tide. Since the stability of the levees is important during the extreme weather, it is necessary to monitor its deformation regularly. Repeat-track space-borne SAR images are useful for environment monitoring, especially ground deformation monitoring. Persistent scatterer technique is carried out to monitor the deformation of the levees. To make the subsidence map, we use 24 scenes recorded from Envisat satellite. The experimental results show that the levees around Pudong airport and Lingang town which were built on the land reclamation suffered serious deformation.