Spatiotemporal features of reclamation subsidence based on multitemporal interferometric synthetic aperture radar: A case study in the southeast Greater Bay Area

作     者：Xiang, Yang He, Xiufeng Shi, Guoqiang Gao, Zhuang Xiong, Jiacheng Xia, Zhuge 

作者机构：Hohai University Ministry of Education Key Laboratory of Maritime Intelligent Network Information Technology Nanjing China Hohai University The School of Earth Sciences and Engineering Nanjing China The Hong Kong Polytechnic University The Department of Land Surveying and Geo-Informatics Hong Kong The University of Tokyo The Earthquake Research Institute Tokyo Japan GFZ German Research Centre for Geosciences Potsdam Germany 

出 版 物：《Journal of Applied Remote Sensing》 (J. Appl. Remote Sens.)

年 卷 期：2025年第19卷第1期

核心收录：

学科分类：0810[工学-信息与通信工程] 070207[理学-光学] 07[理学] 08[工学] 0815[工学-水利工程] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：This research was funded by the National Natural Science Foundation of China (Grant No. 41830110) and the Fundamental Research Funds for the Central Universities (Grant No. B230205015). The authors would like to thank the European Space Agency for providing the Sentinel-1 images 

主　　题：Synthetic apertures 

摘      要：The uneven ground settlement caused by the reinforcement and compaction of filling materials across the Guangdong-Hong Kong-Macao Greater Bay Area (GBA) has continuously threatened infrastructure and the lives and properties of the local people. We utilize a dataset comprising 71 Sentinel-1A images from 2017 to 2023. Applying the small baseline subset interferometric synthetic aperture radar technique, we investigate and analyze the surface deformation of the southeast GBA and its underlying causes and mechanism. The results indicate that the deformation is mainly concentrated over the Hong Kong International Airport and the waterfront areas of southeast GBA, with maximum deformation rates reaching 20 mm/year. Dynamic changes in tidal water levels cause periodic minor vertical deformations in reclaimed areas, with a correlation coefficient greater than 0.61 between them. Within reclaimed areas of the southeast GBA, except for the natural consolidation of soft soils, changes in tidal water levels also play a significant role in ground subsidence, a finding that has been rarely studied or mentioned in previous research, which should be taken into local government s consideration and measurements. Generally, the study area can be divided into three risk levels, i.e., low-risk, medium-risk, and high-risk zones amounting to 1.87%, 0.11%, and 0.01%, respectively. © 2025 Society of Photo-Optical Instrumentation Engineers (SPIE).