Deformation monitoring along Fuzhou metro line based on radar technology

doi:10.13474/j.cnki.11-2246.2021.0214

Abstract

Abstract: In recent years, the massive construction of underground projects such as subways in China has produced serious surface subsidence, which leads to many geological hazards in cities and hinders the development of urbanization in China.Therefore, the use of high spatial resolution and high temporal resolution monitoring technology for urban geological hazards monitoring as well as risk assessment is of great importance for the healthy development of cities. In this study, we apply the SBAS-InSAR technique to monitor the land subsidence in Fuzhou downtown after the program of metro construction. 24 scenes of X-band TerraSAR data from July 2013 to August 2015 and 32 scenes of C-band Sentinel-1 data from July 2015 to February 2018 are used in this experiment. Our results show a maximum subsidence rate of -12 mm/a, and eight subsidence funnels have been found during the observed period. After analyzing the subsidence of these regions in a long time span, it can be concluded that three areas show the characteristics of the initial stage of geological disaster, and there is a possibility of further intensification of surface subsidence.

Key words: small baseline subset, time-series analysis, Fuzhou, ground subsidence, metro

CLC Number:

P237

CHEN Anping, TAN Yuanmo, YANG Cheng, QIN Yongji. Deformation monitoring along Fuzhou metro line based on radar technology[J]. Bulletin of Surveying and Mapping, 2021, 0(7): 86-91,97.

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