基于SBAS-InSAR的上海城区地表沉降监测

Land Subsidence Monitoring in Shanghai Urban Area Based on SBAS-InSAR

利用短基线集(SBAS-InSAR)技术对2017—2019年间的27景哨兵一号(Sentinel-1)进行数据处理,得到了上海城区的地表沉降速率与分布。监测结果表明,该研究区域中,大部份区域的地表形变速率集中在[-4~4]mm/a区间内,在个别地区的最大地表形变速率达到了-25 mm/a。通过监测分析得出研究区域内中的上海虹桥机场周围、前滩附近区域和豪景苑以及中粮天悦壹号周边是3个重点沉降区域,其中前滩附近的四方城开发区域地表沉降最为严重,主要受工程建设、城市化发展和地下水开采等因素影响。为地质灾害的预防提供了实时预警信息。

The short baseline set(SBAS-InSAR)technology is used to process the data of sentinel-1 from 2017 to 2019 in this paper,and then the surface subsidence rate and distribution in Shanghai urban area are obtained.The monitoring results show that the surface deformation rate of most areas is concentrated in the range of[-4~4]mm/a,and the maximum surface deformation rate reaches-25 mm/a in some areas.Through monitoring and analysis,it is concluded that the area around Shanghai Hongqiao Airport,the area near the foreshore and haojingyuan and the surrounding area of COFCO Tianyue No.1 are the three key subsidence areas,among which the sifangcheng development area near the foreshore is the most serious.It is mainly affected by engineering construction,urbanization development and groundwater exploitation,which provides real-time warning information for the prevention of geological disasters.