Marine reclamation took place at large scale in Lianyungang city of Jiangsu province, China during last two decades in order to provide extra land for economy growth. However, large land subsidence usually occurs on newly reclaimed land, which may bring damages to buildings and infrastructures constructed over the reclaimed land and seriously hinder the regional development in turn. Therefore, knowing detailed information about land subsidence over the reclaimed land is of great significance. As a new remote sensing monitoring method, synthetic aperture radar interferometry technology has great advantages in ground subsidence monitoring. Therefore, in this paper, the Sentinel-1A SAR images acquired from 2016 to 2021 are processed using InSAR time series technology to monitor and analyze the spatio-temporal characteristics of ground subsidence in the region. The results show that by the end of 2021, large subsidence occurred over the reclamation area of Lianyungang which is mainly caused by soil consolidation. The maximum subsidence rate is -165 mm/year, and the maximum cumulative subsidence reaches -991 mm during the 6 years, which is located in the northeast of Lianyungang. The deformation monitoring of the region has certain theoretical references for disaster prevention and control.
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Zhou et al. (2024) studied this question.
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