基于SBAS技术监测广州市南沙区地表形变

Monitoring and Analysis of Surface Deformation in Nansha District of Guangzhou City Based on SBAS Technology

广州市南沙区位于广州市最南端,在珠江虎门水道的西岸,连接珠江口两岸城市群,地处广州市珠江出海通道和粤港澳大湾区地理几何中心。随着近年来的工商业开发建设,加之南沙区的地质土壤岩层不稳定,加大了地表形变发生的可能性,进而影响到区域范围内的建构筑物的稳定情况和人类生产活动的安全。通过小基线集干涉监测技术对广州市南沙区进行大范围的区域地表形变监测,监测时间为2018年11月至2020年8月。对所采用的卫星影像数据进行严格筛查,并利用同期水准测量对监测结果进行比对校验。通过对监测结果进行分析,排查出8处较为严重的沉降区域并分析形变原因。最终研究成果可以为未来南沙区城市发展工作提供地表监测与预警抗灾技术支持和保障。

Nansha District of Guangzhou City is located at the southernmost tip of Guangzhou,on the west bank of the Humen Waterway of the Pearl River,and is the connecting area of the city clusters on both sides of the Pearl River Estuary.Due to the recent industrial and commercial development and construction,and the unstable geological soil and rock formations in Nansha District,the possibility of surface deformation has increased so that the stability of regional buildings and the safety of human production activities have met threat.This study conducts a large-scale regional surface deformation monitoring in Nansha District,Guangzhou City,by SBAS-InSAR monitoring technology.The monitoring period is from November 2018 to August 2020.With the satellite image data and the comparison of the monitoring results with leveling data over the same period,and analyzing the monitoring results,8 serious deformation areas were detected and the causes of deformation were analyzed.This study can be used to surface monitoring,early warning and disaster relief for future urban development in Nansha District.