Surface deformation monitoring and driving force analysis in Zhuhai city based on PS-InSAR technology

doi:10.13474/j.cnki.11-2246.2022.0181.

Abstract

Abstract: Land subsidence of Zhuhai city from October 2018 to November 2020 was retrieved by PS-InSAR using 63 Sentinel-1 images. The inversion accuracy is verified by GNSS ground observation data. The root mean square error of monitoring results is 4.58 mm, which showes high reliability for PS-InSAR to monitor land subsidence in study area. The spatial and temporal deformation characteristics of the surface deformation in Zhuhai city are analyzed, and the results show that the average deformation rate of the main part of Zhuhai city are between -55~15 mm/a. The main subsidence areas are distributed in the agricultural reclamation area and coastal port area around the Pearl river waterway. The main transportation lines, Zhuhai link of the Hong Kong-Zhuhai-Macau bridge and Zhuhai section of Guangzhou-Zhuhai railway, both of them have obvious deformation areas with average annual deformation rate of more than 20 mm/a, which need to be paid attention. Using geological conditions and groundwater exploitation data, the driving force of surface deformation in Zhuhai is analyzed. The results show that the ground subsidence rate in study area is positively related to the thickness of soft soil layer, and logarithmically related to the underground water level.

Key words: PS-InSAR, surface subsidence, Sentinel-1 data, Zhuhai city, deformation driving force

CLC Number:

P237

ZHU Bangyan, TANG Chao, REN Zhizhong, MA Zhuang, ZHANG Qi, LI Yun. Surface deformation monitoring and driving force analysis in Zhuhai city based on PS-InSAR technology[J]. Bulletin of Surveying and Mapping, 2022, 0(6): 108-113.

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