Abstract
The land subsidence in response to the construction of underground engineering, e.g., subway, has caused many geological hazards and impeded the sustainable development of urbanization, in particular of China. Analysis of land subsidence with high temporal-spatial resolution is necessary and can help to assess the risk of geohazards. 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 were used in this experiment. Our results show a maximum subsidence rate of -12mm/yr, 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 there are three regions which have a relatively stable disastrous subsidence effect, and there is a possibility of further intensified subsidence.
Highlights
Fuzhou, as the provincial capital of Fujian, China, has made an aggressive effort in expanding its urban construction engineering
For the prevention and control of the impact and damage caused by land subsidence, it is urgent to establish an effective urban subway construction project area deformation monitoring and early warning system
In the field of subway construction engineering in densely populated commercial blocks, deformation monitoring technology is proposed to meet the requirements of high precision, high efficiency, and full time coverage
Summary
As the provincial capital of Fujian, China, has made an aggressive effort in expanding its urban construction engineering. For the prevention and control of the impact and damage caused by land subsidence, it is urgent to establish an effective urban subway construction project area deformation monitoring and early warning system. The SBAS-InSAR technology performs a suitable combination of the acquired data to obtain a series of small baseline subsets of differential interferograms, which can better overcome the atmospheric phase effects. In 2014, Estelle Chaussard used ALOS data for time series deformation studies, analyzed land subsidence problems throughout Mexico City through SBAS-InSAR technology, and successfully identified land subsidence in 21 regions (including 17 cities). Relevant scholars have proved the scientific reliability of InSAR technology on urban ground deformation, the relevant research results are mostly shortterm deformation monitoring based on single-satellite InSAR technology, and it is difficult to continuously monitor the construction process with high precision. Combined with the construction of Fuzhou subway construction and related disaster information, the results of surface deformation during the construction of Fuzhou subway were studied to evaluate the feasibility and practicability of SBAS-InSAR technology in urban building deformation monitoring and to prove that this technology can be one of the convenient and effective monitoring methods in the construction and maintenance of urban buildings
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