Spatial-temporal Characteristics of Land Subsidence in the Typical Reclamation area of Pearl River Estuary based on PS-InSAR
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摘要: 近年来，珠三角地区经济发展迅速，人类活动加剧，软土自固结作用诱发的地面沉降范围与程度逐渐扩大，严重制约城市建设，危害居民人身财产安全。本文以珠江口典型填海区为例，基于2015 年12 月至2016 年12 月的24 幅Sentinel-1A SAR数据影像，应用PS-InSAR 监测地面沉降状态，通过设置可靠PS点，计算沉降速率，提取地面沉降时序特征。结果表明，该时间段内研究区的地面沉降较为严重，整体年均沉降速率为-7.65 mm/a，其中鸡抱沙-孖沙垦区南部、万顷沙地区以及南朗横门三地尤为严重，相继出现四个典型沉降区，最大沉降量达117.48 mm；并通过实地监测数据验证其精度具备高可靠性，该研究可为珠江口城市建设合理规划、地面沉降防治工作提供科学依据。Abstract: In recent years, with the rapid economic development and rich human activities in the Pearl River Delta region, the scope and extent of land subsidence induced by self-consolidation of soft soil have expanded, which seriously restricts the urban construction and then endangers the life and property safety of residents. Taking the typical reclamation area in the Pearl River Estuary as example, we applied PS-InSAR to monitor the land subsidence status based on 24 Sentinel-1A SAR data images from December 2015 to December 2016, and obtained the space-time characteristics of land subsidence by setting reliable PS points and calculating the rate. The results showed that the land subsidence was serious in this period with an average -7.65 mm/a velocity in the researching area, including the most serious Jibaosha-Masha reclamation south area, Wanqingsha area and Nanlang-Hengmen area where four typical subsidence areas appeared successively and the maximum subsidence was 117.48 mm. The field monitoring data was applied to verify the accuracy of the results, providing a scientific basis for the rational planning of urban construction in the Pearl River Estuary and the prevention and control of land subsidence.
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