Monitoring Reclaimed Land Subsidence on Xiamen New Airport with Sentinel-1 Datasets

Xiamen New Airport was planned to be built on the reclaimed land from the sea to solve the problem of scarce urban land resources and meet the increasing transportation demand. However, the coastal reclaimed land is vulnerable to suffer from natural hazard, such as land subsidence. Time series SBAS-InSAR techniques was utilized to investigate the temporal and spatial evolution of Xiamen new airport reclaimed land, based on 36 ascending Sentinel-1 SAR images from January 2018 to April 2019. The InSAR measurements showed that the reclaimed land underwent remarkable deformation on the site of the Xiamen New Airport. The maximum annual deformation rate and accumulative deformation reached up to 208 mm/year and 250 mm respectively. By analyzing the results together with land reclamation evolution and time series subsidence, the land subsidence is expected to continue in the near future. It is necessary to perform continuous subsidence monitoring in these reclaimed area to ensure the safety and stability of Xiamen New Airport.