基于IPTA技术的广州市2017—2020年地铁沿线沉降监测

Ground Subsidence Monitoring of Guangzhou Metro from 2017 to 2020 Based on IPTA Technique

干涉点目标分析技术(IPTA)是一种常用的地表形变监测技术,能够克服大气延迟、时空失相关的影响,获取高精度的监测数据。本文采用IPTA技术对覆盖广州市2017年5月至2020年5月期间的85景Sentinel-1A影像进行处理,获取了广州市的平均形变速率信息。同时,本文还分析了广州市及其地铁沿线形变的空间分布特点。结果显示:广州市地铁沿线的整体地表形变较为稳定,沉降主要集中在6号线沿线,最大的沉降漏斗位于柯木塱站,沉降速率达到了-39.5 mm/yr。结合实地考察结果,IPTA技术能够为大范围城市地铁沿线的沉降监测提供可靠的信息支撑。

Interference Point Target Analysis(IPTA)is a commonly used technique for ground subsidence monitoring,which can overcome the effects of atmospheric delays and spatio-temporal dis-correlation to obtain high-accuracy monitoring data.In this paper,we use IPTA and 85 Sentinel-1A images acquired between May 2017 and May 2020 to obtain the annual average subsidence rate of Guangzhou.Besides,this paper analyzes the spatial distribution characteristics of subsidence along the metro in Guangzhou.The results show that the overall ground surface along the metro in Guangzhou is relatively stable,and the settlements are mainly concentrated along Line 6,with the largest settlement funnel located at Kemulang Station,where the settlement rate reaches-39.5 mm/yr.Combined with the on-site validation results,it proves that IPTA can provide reliable information for settlement monitoring along the metro in a large-scale city.