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

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.

海平面上升的威胁

气候变暖导致海平面上升。过去100年间我国海平面上升了20～30厘米。海平面上升给我国经济较为发达的沿海地区带来严重影响,风暴潮袭击和洪水泛滥的几率增加,未来发展蒙上了厚厚的阴影。