基于QPS-InSAR珠江口西岸地面沉降监测

Land Subsidence Monitoring of the West Bank of the Pearl River Estuary Based on QPS-InSAR

高速发展合成孔径雷达干涉测量技术(interferometric synthetic aperture radar,InSAR),特别是准永久散射体干涉测量技术(quasi-permanent scatterer InSAR,QPS-InSAR)克服了大气延迟效应和时间、空间去相干对干涉条纹的影响,为地面沉降监测提供了更加可靠的技术方法。采用珠江口西岸2017年6月至2018年11月的18景Sentinel-1A雷达影像,基于QPS-InSAR技术开展地面沉降速率监测研究,结果显示该地区整体平均年沉降速率在19 mm/a,和水准监测的年平均沉降速率变化趋势基本一致,并结合区域软土分布规律进一步证明沉降与软土基底特性的联系。研究表明,利用QPS-InSAR在大范围区域实现高效、经济快速、高精度密度的地面沉降进行监测是可行的。

In recent years,the rapid development of synthetic aperture radar interferometric technology(InSAR),especially quasi-permanent scatterer interferometry(QPS-InSAR)has overcome the impact of atmospheric delay effect and temporal and spatial decoherence on interference fringe,providing a more reliable technical method for ground settlement monitoring.This paper uses the 18-scene Sentinel-1A radar images from June 2017 to November 2018 on the west bank of the Pearl River Estuary to carry out the ground settlement rate monitoring research based on QPS-InSAR technology.The results show that the overall average annual settlement rate in the region is basically 19 mm/a,and the trend of annual average subsiding rate of level monitoring is about the same.Finally,combined with the distribution law of regional soft soil,this paper further proves the relationship between settlement and soft soil base characteristics.This paper also proves that in a large range of areas,high efficiency,economical,fast and high precision density ground settlement monitoring by QPSInSAR is feasible and reliable.