TY - JOUR
T1 - Megalopolitan-scale ground deformation along metro lines in the Guangdong-Hong Kong-Macao Greater Bay Area, China, revealed by MT-InSAR
AU - Zhang, Bochen
AU - Liao, Xianing
AU - Zhang, Jiayuan
AU - Xiong, Siting
AU - Wang, Chisheng
AU - Wu, Songbo
AU - Zhu, Chuanhua
AU - Zhu, Jiasong
AU - Qin, Xiaoqiong
AU - Li, Qingquan
N1 - Funding Information:
This work was supported by the Guangdong Basic and Applied Basic Research Foundation (No. 2021A1515011427 and 2022A1515110861), the Shenzhen Scientific Research and Development Funding Program (Grants 20200807110745001 and 20190808120005713), the Shenzhen Metro Group Company, Limited. Scientific Research Consulting Services (STJS-DT413-KY002/2021), and the University Grants Council of the Hong Kong Polytechnic University (1-BD2S). We thank ESA/Copernicus for providing the Sentinel-1A SAR images.
Publisher Copyright:
© 2023 The Authors
PY - 2023/8
Y1 - 2023/8
N2 - As one of the most densely populated and rapidly growing metropolitan areas worldwide, the Guangdong-Hong Kong-Macao Greater Bay Area (GBA) of China has been developing extensive metro networks to relieve the escalating traffic congestion inner cities and to shorten public transport time inter cities. Metro construction possibly triggers ground deformation, which may result in damage to the tunnel, pipeline, and ground structures. Fast and efficient monitoring ground deformation along metro lines is vital not only to the metro itself but also to these structures. This study provides a comprehensive investigation of ground deformation along 67 metro lines within the GBA, based on multi-temporal synthetic aperture radar interferometry (MT-InSAR) by using Sentinel-1 from March 2017 to February 2022. The results reveal that deformation velocity in this area ranges from –39.4 mm/year to 14.2 mm/year, which is mainly caused by the tunnel excavation, adjacent excavation and construction, and unfavorable geological conditions. Furthermore, risk levels have been evaluated based on the InSAR-derived results with the proposed median absolute deviation heatmap clustering method. The risky area accounts for 16.31% (∼205.24 km2) of the whole study area in the GBA, among which 13.76%, 2.16%, and 0.39% are classified as three risk levels, with mean deformation velocities of –2.2 mm/year, –3.4 mm/year, and –6.5 mm/year, respectively. This study presents a comprehensive megalopolitan-scale ground deformation monitoring, for the first time, along metro lines in six cities of the GBA, which provides important insights into future metro line constructing, operating and planning.
AB - As one of the most densely populated and rapidly growing metropolitan areas worldwide, the Guangdong-Hong Kong-Macao Greater Bay Area (GBA) of China has been developing extensive metro networks to relieve the escalating traffic congestion inner cities and to shorten public transport time inter cities. Metro construction possibly triggers ground deformation, which may result in damage to the tunnel, pipeline, and ground structures. Fast and efficient monitoring ground deformation along metro lines is vital not only to the metro itself but also to these structures. This study provides a comprehensive investigation of ground deformation along 67 metro lines within the GBA, based on multi-temporal synthetic aperture radar interferometry (MT-InSAR) by using Sentinel-1 from March 2017 to February 2022. The results reveal that deformation velocity in this area ranges from –39.4 mm/year to 14.2 mm/year, which is mainly caused by the tunnel excavation, adjacent excavation and construction, and unfavorable geological conditions. Furthermore, risk levels have been evaluated based on the InSAR-derived results with the proposed median absolute deviation heatmap clustering method. The risky area accounts for 16.31% (∼205.24 km2) of the whole study area in the GBA, among which 13.76%, 2.16%, and 0.39% are classified as three risk levels, with mean deformation velocities of –2.2 mm/year, –3.4 mm/year, and –6.5 mm/year, respectively. This study presents a comprehensive megalopolitan-scale ground deformation monitoring, for the first time, along metro lines in six cities of the GBA, which provides important insights into future metro line constructing, operating and planning.
KW - Ground deformation
KW - Guangdong-Hong Kong-Macao Greater Bay Area (GBA)
KW - Metro system
KW - Multi-temporal InSAR
KW - Risk assessment
UR - http://www.scopus.com/inward/record.url?scp=85166260858&partnerID=8YFLogxK
U2 - 10.1016/j.jag.2023.103432
DO - 10.1016/j.jag.2023.103432
M3 - Journal article
AN - SCOPUS:85166260858
SN - 1569-8432
VL - 122
JO - International Journal of Applied Earth Observation and Geoinformation
JF - International Journal of Applied Earth Observation and Geoinformation
M1 - 103432
ER -