利用时序DInSAR监测填海造陆地区地表沉降

Monitoring Subsidence in Reclamation Area with Time Series DInSAR Images

通过研究时序DInSAR相位模型,利用振幅离差、时间相干系数和统计分析多重方法提取了相干点目标,并根据不同相位分量的时空特性分离出形变相位,继而提取出相干点目标上的沉降速率。以上海市临港新城主城区为实验区,利用24景Envisat ASAR影像,得到了2007-10～2010-02间的沉降速率分布,并分析了冲填土年代对沉降的影响。

The serious subsidence in reclamation area may cause inaccurate topographic survey based on bench points.Time series DInSAR is an effect method to detect subsidence velocity.We analyze the interferogram phase model,and use amplitude dispersion values and temporal coherence to select coherent points.According to the different space-time characteristics,we separate and extract the deformation phase,and detect subsidence velocity.24 Envisat ASAR images acquired from Oct.2007 to Feb.2010 were used to detect subsidence velocity.The results show that the age of Hydraulic-Fill Soil will affect the subsidence.