基于Sentinel-1数据的天津滨海新区地面沉降监测

Land Subsidence Monitoring in Tianjin Binhai New Area Based on Sentinel-1 Data

Sentinel-1的渐进扫描采集模式可以实现大面积覆盖,且因其12d的重访周期,非常适用于地面沉降监测工作。基于2015年5月至2016年6月的25景Sentinel-1TOPS合成孔径雷达图像,采用小基线集InSAR技术研究天津市滨海新区的广域地表沉降特征,并结合城市规划对地面沉降原因进行分析。监测成果表明:2015-2016年,由于大量渔业养殖、软土沉积等原因,地表沉降严重区主要分布在沿海区域。

The terrain observation with progressive scans(TOPS)acquisition mode of Sentinel-1 provides a wide coverage per acquisition,and features of a repeat cycle of 12 days make this acquisition mode attractive for surface subsidence monitoring.Based on the Sentinel-1 TOPS synthetic aperture radar image from May 2015 to June 2016,this paper studies the wide-area surface settlement characteristics of Tianjin Binhai new area by the means of small baseline set InSAR technology.The reasons of subsidence are also analyzed on the basis of the urban planning in this area.The monitoring results show that:from 2015 to 2016,due to a large number of fishery farming and soft soil deposition,the serious surface subsidence areas are mainly distributed in coastal areas and internal industrial areas.