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PS-InSAR-based monitoring and analysis of surface subsidence in Shanghai |
ZHANG Zhihua1,2,3( ), HU Changtao1,2,3, ZHANG Zhen1,2,3, YANG Shuwen1,2,3 |
1. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China 2. National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring, Lanzhou 730070, China 3. Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou 730070, China |
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Abstract Urban surface subsidence has increasingly severe impacts on human life, making it particularly important to study the methods for effectively monitoring surface subsidence. To monitor the surface subsidence in Shanghai, this study processed 24 scenes of 2019—2020 Sentinel-1A data covering the city using the PS-InSAR technique. After treatment using the permanent scatterer interferometry technique, the residual phase correction was performed using SRTM1 DEM, and the surface subsidence results of the two years were extracted. The analysis of the subsidence rate and cumulative subsidence amplitude in the monitoring results shows that the urban area mainly shows uneven surface subsidence with multiple subsidence funnels, some of which correspond to the historical subsidence data. As shown by time-series surface subsidence data of seldomly selected ground characteristic points, the surface subsidence at these points basically had the same deformation amplitude at different times and highly consistent changing trends, verifying the reliability of the PS-InSAR monitoring method. The results of this study will provide data and decision-making bases for geologic disaster prevention and control in Shanghai.
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Keywords
surface subsidence
InSAR
PS-InSAR
Shanghai
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Issue Date: 21 September 2022
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