基于MT-InSAR技术的厦门新机场填海区沉降监测

选取厦门新机场填海区为研究对象,收集2016年12月至2018年11月期间的56景升轨Sentinel-1雷达影像,采用多时相In SAR(Multi-temporal In SAR,MT-InSAR)技术,获取了填海区由软土层固结压缩引起的沉降场。针对不同填海时间的场地,探讨其形变特征及原因,并对比分析了In SAR监测结果与同期水准测量结果。结果表明,一期填海区沉降主要发生在2017年6月份以前,后期已趋于平稳,监测点最大沉降速率为-43.6mm/yr;二期填海区场地整体表现出不同程度的沉降,主要沉降区位于新近完成填海的区域,监测点最大沉降速率为-129.1mm/yr,且场地沉降量与淤泥厚度之间具有较高的正相关性。同时In SAR与水准数据具有较高的一致性,验证了MT-InSAR技术在填海区沉降监测方面的适用性,后续可为机场沉降灾害的预防和控制提供科学依据。

Monitoring ground settlement of reclamation land of Xiamen new airport with MT-InSAR method

In order to analyze the land settlement in the reclamation area of Xiamen new airport,we collected 56 Sentinel-1 SAR images with ascending orbit,ranging from December of 2016 to November of2018,and used the MT-InSAR technology to get the settlement caused by the consolidation and compression of soft soil layer in the reclamation area.The results are also validated by comparison with traditional leveling.It shows that the ground settlement of the first-stage reclamation area mainly occurred before June 2017 and become stable in the later period.,the maximum settlement rate of the monitoring point is-43.6 mm/yr,and the major settlement of the second-stage reclamation area is located in the area where the reclamation has been completed most recently,the maximum settlement rate of the monitoring point is-129.1 mm/yr,and there is high positive correlation between the settlement and the thickness of the silt.Besides,the results of InSAR highly coincide with traditional leveling,which further confirm that MT-InSAR can be used in land settlement monitoring of reclamation area,providing a scientific basis for monitoring deformation of airport construction.