Bulletin of Surveying and Mapping ›› 2023, Vol. 0 ›› Issue (7): 142-148.doi: 10.13474/j.cnki.11-2246.2023.0215

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The application of PS-InSAR in the monitoring of the settlement of the Yangtze River levee

SHI Yintao1, HU Chao1, ZHAO Gang2, HOU Tingting3   

  1. 1. School of Geomatics Science and Technology, Nanjing Tech University, Nanjing 211816, China;
    2. Jiangsu Provincial Hydraulic Research Institute, Nanjing 210017, China;
    3. Department of Geography and Spatial Information Techniques, Ningbo University, Ningbo 315211, China
  • Received:2022-10-18 Online:2023-07-25 Published:2023-08-08

Abstract: Implementing and promoting the management and protection of the Yangtze River has always been a major task of the Yangtze River water conservancy work. As an important barrier to protect the development of the economic belt along the river, the deformation monitoring of the safety of the levee along the river is one of the important contents in the operation and management of the Yangtze River. As a new and large-scale monitoring method, InSAR has great promotion value in the investigation of hidden dangers of water conservancy projects. This paper uses PS-InSAR technology and Sentinel-1A image to extract the temporal and spatial distribution of deformation of Meizizhou in Nanjing and its surrounding levee from April 2020 to January 2022, and verify its reliability by combining the leveling data of the same period. The results show that the deformation of the levee on the Yangtze River is more obvious than that on the Jiajiang river, and the deformation rate of the levee near Qianzhou can reach -20 mm/a. Overall, the Meizizhou levee presents a consistent settlement deformation, and the differential deformation is not significant, indicating that the river levee in this area is relatively stable. PS-InSAR observation has a high consistency between the temporal and spatial distribution of deformation and the leveling data, indicating that this technology is suitable for monitoring the settlement changes of the Yangtze River levee, and can be used for large-scale Yangtze River levee risk investigation and analysis. Early identification of hidden dangers provides a feasible technical means.

Key words: levee, settlement monitoring, time series, PS-InSAR, Sentinel-1A

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