Abstract
Shenzhen, the first special economic zone of China, has witnessed earth-shaking changes since the late 1980s. In the past 35 years, about 80 km2 of land has been reclaimed from the sea in Shenzhen. In order to investigate coastal vertical land motions associated with land reclamation, we proposed an elaborated Point Target (PT) based Small Baseline Subset InSAR (SBAS-InSAR) strategy to process an ENVISAT ASAR ascending and descending orbits dataset both acquired from 2007 to 2010. This new strategy can not only select high density PTs but also generate a reliable InSAR measurement with full spatial resolution. The inter-comparison between InSAR-derived deformation velocities from different orbits shows a good self-consistency of the results extracted by the elaborated PT-based SBAS-InSAR strategy. The InSAR measurements show that the reclaimed land is undergoing remarkable coastal subsidence (up to 25 mm/year), especially at the Shenzhen Airport, Bao’an Center, Qianhai Bay and Shenzhen Bay. By analyzing the results together with land reclamation evolution, we conclude that the ground deformation is expected to continue in the near future, which will amplify the regional sea level rise.
Highlights
The Coastal Zone [1] plays a very important role in transportation, the circulation of resources and funds, etc
Due to the side-looking geometry, the InSAR measurement is the sum of the projections of ground three-dimensional (3-D) ground deformations in the (Line-of-Sight) LOS direction
To meet the demand of urbanization and economic development, about 80 km2 of land has been reclaimed from the sea in Shenzhen over the past three decades
Summary
The Coastal Zone [1] plays a very important role in transportation, the circulation of resources and funds, etc. The MT-InSAR exploits a set of high phase-quality pixels [20], other than the original full two-dimensional image grid, to map the deformation history and the corresponding average deformation velocity. It can overcome most intrinsic temporal and geometric. The marine sediments of the Quaternary period widely spread across the low-lying coastal land areas. This sediment layer is of high water content and high compressibility, big void ratio, and weak shearing strength [35].
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