基于SBAS技术的厦门市地表沉降监测

Monitoring the ground subsidence in Xiamen City based on small baseline subset technique

近年来,由于城市地表沉降带来的次生灾害后果十分严重,在长江三角洲和福建西南沿海,此类现象更为明显突出,给城市的健康可持续发展带来了很大的阻碍。合成孔径雷达遥感对地监测技术(InSAR)具有大范围成像和全天侯监测的特点,广泛应用于城市地表形变监测研究当中。小基线集技术(SBAS)作为一种基于D-InSAR技术改进发展起来的时序InSAR技术,在长时间维度上的监测精度更优,理论值可以达到毫米级别。研究利用SBAS技术,基于Sentinel-1A数据对福建省厦门市进行了地表形变监测。实验结果发现厦门市区下沉速率较快、下沉现象明显的小范围沉降区域,为地质灾害的预防及后续技术监测提供了不可多得的实时预警信息。

In recent years,the safety of public lives and property has been seriously affected by the secondary disasters caused by the effect of urban surface subsidence,but this phenomenon is more obvious in the Yangtze River Delta plain and the southwest coastal plain of Fujian Province.This brings great obstacles to the harmonious and healthy development of the city.Synthetic Aperture Radar Interferometry(InSAR)technology has incomparable advantages in obtaining surface deformation information because of its characteristics of all-day,all-weather,wide range of monitoring.Small baseline subset technique(SBAS)is a time-series InSAR technology developed on the basis of traditional D-InSAR technology.Its monitoring accuracy is higher,and even millimeter deformation can be detected.In this research,SBAS technique and Sentinel-1A data are used to monitor the surface deformation of Xiamen City,Fujian Province.The experimental result shows that the subsidence area in Xiamen has a rapid subsidence rate and obvious subsidence phenomenon,which provides rare real-time early warning information for the prevention of geological hazards and subsequent technical monitoring.