PS-InSAR monitoring and analysis of ground subsidence in large-scale water diversion project

doi:10.13474/j.cnki.11-2246.2025.0704

Abstract

Abstract: The South-to-North Water Diversion project is a national strategic project aimed at alleviating the problem of unequal distribution of water resources between the south and the north. Ground deformation monitoring along the project can identify potential safety hazards and is greatly significant to the safe operation of this large-scale water diversion project. 45 Sentinel-1A imagery data from July 2020 to June 2023 are acquired for the Tianjin branch of the South-to-North Water Diversion project.Persistent scatterer interferometric synthetic aperture radar (PS-InSAR) is used to monitor the ground subsidence in the study area. The average annual rate and the cumulative amount of subsidence in the area are obtained. The reliability of PS-InSAR in measuring ground deformation is verified by comparing with the data of Global Navigation Satellite System (GNSS).The results show that the average ground subsidence rate in the study area ranges from -72.26 to 17.30 mm/a during the study time. There are two obvious subsidence zones along the Tianjin branch, which one is located at the junction of Xiongxian county and Gu'an county, and another the eastern part of Bazhou city. The main reasons of ground subsidence in the area include over-exploitation of groundwater and the increase of ground loads due to urban infrastructure construction and accelerated industrialization.The lag time of ground deformation in the study area compared to groundwater level changes is about 1 to 3 years.

Key words: PS-InSAR, monitoring of ground subsidence, middle route of the South-to-North Water Diversion project

CLC Number:

P237

XIONG Chunbao, AN Hewen, SU Guangli. PS-InSAR monitoring and analysis of ground subsidence in large-scale water diversion project[J]. Bulletin of Surveying and Mapping, 2025, 0(7): 19-25,72.

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