Analysis of urbanisation-induced land subsidence in Shanghai

Xu, Ye‐Shuang; Ma, Lei; Du, Yan-Jun

doi:10.1007/s11069-012-0220-7

Cited by 143 publications

(54 citation statements)

References 17 publications

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“…To overcome these fundamental limitations, and in order to retrieve a unique displacement time-series (from 2007 to 2016) through combination of available CSK and ASAR/ENVISAT datasets, we developed and applied a proper methodology. The adopted multi-platform combination technique relies on the underlying assumption that, over areas under reclamation, the observed deformations are mostly vertical; moreover, it exploits the knowledge of proper time-dependent geotechnical models [15,19,[40][41][42][43]. The achieved results are in general agreement with previous studies [43,44], which reported that Lingang New City was characterized, from 2007 to 2010, by annual subsidence rates ranging between 12 and 18 mm/year.…”

Section: Introductionsupporting

confidence: 78%

“…The adopted multi-platform combination technique relies on the underlying assumption that, over areas under reclamation, the observed deformations are mostly vertical; moreover, it exploits the knowledge of proper time-dependent geotechnical models [15,19,[40][41][42][43]. The achieved results are in general agreement with previous studies [43,44], which reported that Lingang New City was characterized, from 2007 to 2010, by annual subsidence rates ranging between 12 and 18 mm/year. They also show that higher deformation rates are measured in regions that are more proximal to the southeastern coast, in correspondence with the reclamation project that was started later.…”

Section: Introductionsupporting

confidence: 78%

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The Use of C-/X-Band Time-Gapped SAR Data and Geotechnical Models for the Study of Shanghai’s Ocean-Reclaimed Lands through the SBAS-DInSAR Technique

et al. 2016

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Abstract:In this work, we investigate the temporal evolution of ground deformation affecting the ocean-reclaimed lands of the Shanghai (China) megacity, from 2007 to 2016, by applying the Differential Synthetic Aperture Radar Interferometry (DInSAR) technique known as the Small BAseline Subset (SBAS) algorithm. For the analysis, we exploited two sets of non-time-overlapped synthetic aperture radar (SAR) data, acquired from 2007 to 2010, by the ASAR/ENVISAT (C-band) instrument, and from 2014 to 2016 by the X-band COSMO-SkyMed (CSK) sensors. The long time gap (of about three years) existing between the available C-and X-band datasets made the generation of unique displacement time-series more difficult. Nonetheless, this problem was successfully solved by benefiting from knowledge of time-dependent geotechnical models, which describe the temporal evolution of the expected deformation affecting Shanghai's ocean-reclaimed platforms. The combined ENVISAT/CSK (vertical) deformation time-series were analyzed to gain insight into the future evolution of displacement signals within the investigated area. As an outcome, we find that ocean-reclaimed lands in Shanghai experienced, between 2007 and 2016, average cumulative (vertical) displacements extending down to 25 centimeters.

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Section: Introductionsupporting

confidence: 78%

Section: Introductionsupporting

confidence: 78%

The Use of C-/X-Band Time-Gapped SAR Data and Geotechnical Models for the Study of Shanghai’s Ocean-Reclaimed Lands through the SBAS-DInSAR Technique

et al. 2016

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“…From 1921 to 1965, land subsidence and the net withdrawal volume (NWV), which equals the groundwater withdrawal volume minus the groundwater recharge volume, both increased annually in the urban area [4,7,8,10,25]. Since 1966, some measures related to groundwater control have been adopted, such as the banning of unnecessary groundwater withdrawal, changing the withdrawal source to deeper aquifers, and adopting artificial recharge; additionally, land subsidence has been controlled within a small region [26].…”

Section: Increase In the Subsidence Rate Since 1989mentioning

confidence: 99%

Analysis of Factors in Land Subsidence in Shanghai: A View Based on a Strategic Environmental Assessment

Ren

2016

Sustainability

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128

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Abstract:It has been observed that in the urban center of Shanghai, land subsidence has accelerated, and the groundwater level has continued to drop even though the net withdrawn volume (NWV) of groundwater has remained unchanged since 1980. An analysis of monitoring data shows that drawdown of the groundwater level is one of the factors that have influenced land subsidence since 1980. The NWV of groundwater in urban areas, however, is not the critical factor controlling the drawdown of the groundwater level. Since the 1980s, there have been many underground works constructed in the unique strata of Shanghai, which has an interlayered structure known as a multi-aquifer-aquitard system (MAAS). Investigation into land subsidence caused by urban construction is now receiving much attention. Based on the principle of a strategic environmental assessment (SEA) for sustainable urban development, this paper presents a discussion and analysis of the factors which can influence the development of land subsidence during continued urbanization in Shanghai. The main factors include the additional loading caused by the construction of structures, the cut-off effect due to construction in aquifers, the drawdown of groundwater level caused by leakage into underground structures, and the decrease of groundwater recharge from neighboring zones. SEA is recommended for the future development of Shanghai.

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“…It is generally recognized that groundwater withdrawal was the major driver of subsidence in several major cities, such as Mexico City, Beijing and Shanghai [9,11,[42][43][44]. There has been no large-scale groundwater exploitation in LZND in recent years, and the groundwater level has increased due to the "Lead into the Qin Engineering" hydraulic diversion project [24].…”

Section: Relationship Between Land Subsidence and Groundwatermentioning

confidence: 99%

Detection of Land Subsidence Associated with Land Creation and Rapid Urbanization in the Chinese Loess Plateau Using Time Series InSAR: A Case Study of Lanzhou New District

et al. 2018

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Lanzhou New District is the first and largest national-level new district in the Loess Plateau region of China. Large-scale land creation and rapid utilization of the land surface for construction has induced various magnitudes of land subsidence in the region, which is posing an increasing threat to the built environment and quality of life. In this study, the spatial and temporal evolution of surface subsidence in Lanzhou New District was assessed using Persistent Scatterer Interferometric Synthetic Aperture radar (PSInSAR) to process the ENVISAT SAR images from [2003][2004][2005][2006][2007][2008][2009][2010], and the Small Baseline Subset (SBAS) InSAR to process the Sentinel-1A images from 2015-2016. We found that the land subsidence exhibits distinct spatiotemporal patterns in the study region. The spatial pattern of land subsidence has evidently extended from the major urban zone to the land creation region. Significant subsidence of 0-55 mm/year was detected between 2015 and 2016 in the land creation and urbanization area where either zero or minor subsidence of 0-17.2 mm/year was recorded between 2003 and 2010. The change in the spatiotemporal pattern appears to be dominated mainly by the spatial heterogeneity of land creation and urban expansion. The spatial associations of subsidence suggest a clear geological control, in terms of the presence of compressible sedimentary deposits; however, subsidence and groundwater fluctuations are weakly correlated. We infer that the processes of land creation and rapid urban construction are responsible for determining subsidence over the region, and the local geological conditions, including lithology and the thickness of the compressible layer, control the magnitude of the subsidence process. However, anthropogenic activities, especially related to land creation, have more significant impacts on the detected subsidence than other factors. In addition, the higher collapsibility and compressibility of the loess deposits in the land creation region may be the underlying mechanism of macro-subsidence in Lanzhou New District. Our results provide a useful reference for land creation, urban planning and subsidence mitigation in the Loess Plateau region, where the large-scale process of bulldozing mountains and valley infilling to create level areas for city construction is either underway or forthcoming.

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Analysis of urbanisation-induced land subsidence in Shanghai

Cited by 143 publications

References 17 publications

The Use of C-/X-Band Time-Gapped SAR Data and Geotechnical Models for the Study of Shanghai’s Ocean-Reclaimed Lands through the SBAS-DInSAR Technique

The Use of C-/X-Band Time-Gapped SAR Data and Geotechnical Models for the Study of Shanghai’s Ocean-Reclaimed Lands through the SBAS-DInSAR Technique

Analysis of Factors in Land Subsidence in Shanghai: A View Based on a Strategic Environmental Assessment

Detection of Land Subsidence Associated with Land Creation and Rapid Urbanization in the Chinese Loess Plateau Using Time Series InSAR: A Case Study of Lanzhou New District

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