基于SBAS-InSAR技术的填海造陆区地表形变监测与分析——以天津港为例

Monitoring and analysis of surface deformation in land reclamation area based on SBAS-InSAR technology—take Tianjin port for example

为了探究SBAS-InSAR技术在海岸带填海造陆区形变监测的适用性,本文基于28景Sentinel-1A影像,利用SBAS-InSAR技术获取了天津港填海造陆区2018年1月至2019年11月的地表形变信息,揭示天津港填海造陆区的地表形变特征,并分析沉降速率与填海造陆的时间、土地利用类型的关系。结果表明:天津港填海造陆区具有沉降速率范围跨度大、不均匀沉降和多个沉降漏斗的特点,沉降速率范围为-74.9-19.7 mm/a;沉降速率与填海造陆时间成反比,早期填海造陆区沉降速率较小,新填海造陆区沉降速率较大;不同土地利用类型的沉降速率差异大。该研究验证了SBAS-InSAR技术在填海造陆区形变监测应用的可行性,为海岸带、海岛礁、滩涂等沿海地区的地面沉降的监测与分析提供了思路。

In order to explore the applicability of SBAS-InSAR technology to the deformation monitoring in coastal reclamation areas,this paper,based on 28 Sentinel-1A images,uses SBAS-InSAR technology to obtain the surface deformation information of the Tianjin Port reclamation area from January 2018 to November 2019,which reveals the characteristics of surface deformation in the land reclamation area of Tianjin Port and analyzes the relationship between the subsidence rate and reclamation time and land use type.The results show that the land reclamation area of Tianjin Port has the characteristics of a wide range of subsidence rate,uneven settlement and multiple settlement funnels.The subsidence rate ranges from-74.9 to19.7mm/a and it is inversely proportional to the land reclamation time.The subsidence rate of the early reclamation area is smaller,while that of the newly reclamation area is higher.The subsidence rate varies greatly among different land use types.This study verifies the feasibility of SBAS-InSAR Technology in the deformation monitoring of reclamation areas,and provides ideas for the monitoring and analysis of land subsidence in coastal areas such as coastal zones,islands and tidal flat.