Anatomy of Subsidence in Tianjin from Time Series InSAR

Liu, Peng; Li, Qingquan; Li, Zhenhong; Hoey, Trevor; Liu, Guoxiang; Wang, Chisheng; Hu, Zhongwen; Zhou, Zhiwei; Singleton, Andrew

doi:10.3390/rs8030266

Cited by 36 publications

(21 citation statements)

References 59 publications

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“…We now investigate the large subsidence bowl centered on Wangqingtuo Town in the west of Tianjin city. Groundwater pumping is the main driver of subsidence in this area, which has been discussed and documented in many literatures [6], [31], [32]. The horizontal displacement induced by aquifer compaction can be strong and its damages to infrastructures have been reported [32].…”

Section: 'mentioning

confidence: 99%

“…Land subsidence at a spatially varying rates of 20-110 mm/yr since 1950s have been measured and documented in Tianjin [6], [24], [30]. The latest comprehensive studies, including complementary data collected with synthetic aperture radar (SAR) images from ENVISAT and ALOS satellites, spirit leveling and precipitation data, showed a maximum rate of 170 mm/yr located in the west of Tianjin city [31]. High spatial resolution TerraSAR-X images from 2009 to 2013 were processed to depict a more detailed location of land subsidence [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

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Spatial Variability of Relative Sea-Level Rise in Tianjin, China: Insight From InSAR, GPS, and Tide-Gauge Observations

Tang

Wei

Jin

et al. 2021

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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The Tianjin coastal region in Bohai Bay, Northern China, is increasingly affected by storm-surge flooding which is exacerbated by anthropogenic land subsidence and global sealevel rise (SLR). We use a combination of InSAR (Synthetic Aperture Radar Interferometry), CGPS (continuous GPS), and tide-gauge observations to evaluate the spatial variability of relative SLR (RSLR) along the coastline of Tianjin. Land motion obtained by integration of two tracks of Sentinel-1 SAR images and nineteen CGPS stations shows that the recent land subsidence in Tianjin downtown is less than 8 mm/yr, which has significantly decreased with respect to the last 50 years (up to 110 mm/yr in the 1980s). This might benefit from the South-to-North Water Transfer Project which has provided more than 1.8 billion cubic meters of water for Tianjin city since 2014 and reduced groundwater consumption. However, subsidence centers have shifted to suburbs, especially along the coastline dominated by reclaimed harbors and aquaculture industry, with localized subsidence up to 170 mm/yr. Combining InSAR observations with sea level records from tide-gauge stations reveals spatial variability of RSLR along the coastline. We find that, in the aquaculture zones along the coastline, the rates of land subsidence are as high as 82 mm/yr due to groundwater extraction for fisheries, which subsequently cause local sea levels to rise nearly 30 times faster than the global average. New insights into land subsidence and local sea-level rise could help the country's regulators to make decisions on ensuring the sustainable development of the coastal aquaculture industry.

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Section: 'mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatial Variability of Relative Sea-Level Rise in Tianjin, China: Insight From InSAR, GPS, and Tide-Gauge Observations

Tang

Wei

Jin

et al. 2021

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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“…From 1935 to 2013, the maximum accumulated subsidence grew to 1.49 m, and the area of accumulated settlement over 50 mm in the Beijing Plain reached more than 4300 km 2 [23]. In Tianjin, the average subsidence was estimated to be 26 mm/yr, and the maximum subsidence reached 117 mm/yr, in 2015, exhibiting an attenuation trend [24,25,26]. The area with a subsidence rate higher than 10 mm was 7701 km 2 .…”

Section: Study Area and Data Descriptionmentioning

confidence: 99%

Monitoring Differential Subsidence along the Beijing–Tianjin Intercity Railway with Multiband SAR Data

Shi

Chen

Gong

et al. 2019

IJERPH

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High-speed railways have strict standards of infrastructure deformation and post-construction settlement. The interferometric synthetic aperture radar (InSAR) has the ability to detect ground deformation with a high accuracy and wide coverage and is becoming a useful tool for monitoring railway health. In this study, we analyzed the Beijing–Tianjin Intercity Railway (BTIR) track using InSAR time-series analysis with different data sets. First, by using RADARSAT-2 images, we examined the areas along the BTIR with significant subsidence. Then, we characterized these areas by means of X-band TerraSAR-X data. We adopted the expectation (Ex) and entropy (En) method, combined with GIS spatial analysis, to analyze the ground settlement differences on both sides of the railway. The results show that the area with the most severe differential settlement occurs between 12 and 20 km along the railway and within 120 to 20 m on both sides of the Chaoyang–Tongzhou section (CTS). Thereafter, we analyzed the reasons for the large difference in this area by considering different factors, e.g., regional land subsidence, groundwater level changes, and the dynamic load. In addition, we studied the impact of regional subsidence on the safe operation of the BTIR. The results show that the maximum different settlement along the BTIR is within the safe range, according to the high-speed railway design standard between 2010 and 2015. This study aims to provide technical support for assessing the impact of subsidence on the safety of railway operations.

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“…The extracted significant periodic signal is represented by the cone of influence (COI), where the phase discontinuity drops by e −2 at the boundary of the COI. The CWT is used to define the relationship between different geophysical processes-for example, the Baltic maximum sea ice extent and Arctic Oscillation index [14], land subsidence and GWS volume change [31], and climate, vegetation factors, and ∆TWS [32]. We employed the CWT to expand the groundwater volume changes and vertical displacements with corresponding time into a time-frequency space.…”

Section: Cross-wavelet Transform Between Depletion and Displacementsmentioning

confidence: 99%

Quantifying Vertical Deformation in the Tigris–Euphrates Basin Due to the Groundwater Abstraction: Insights from GRACE and Sentinel-1 Satellites

Rateb

Kuo

2019

Water

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This study explores the occurrences of land subsidence in response to dropping groundwater levels in the central part of the Tigris-Euphrates basin. We estimated the groundwater depletion related to human and climate drivers between 2003 and 2017 based on estimates from the Gravity Recovery and Climate Experiment (GRACE) and two global hydrological models (NOAH-3.3 and WGHM-2.2d). The cumulative displacement was calculated using Small Baseline Subset Interferometric Synthetic Aperture Radar (SBAS-InSAR) for 96 interferograms, which were generated by 31 images acquired by the Sentinel-1 satellite. The results show that the basin is experiencing a decline in groundwater storage at a rate of −7.56 km 3 /year with a total loss of 106.81 km 3 . This depletion rate has led to inelastic compaction and has resulted in subsidence near the city of Baghdad at a rate of −10 mm/year. The measured coherence phase between the two signals is~0.67, and the depletion precedes the subsidence by~1.5 months. The new data from GRACE-Follow on, Sentinel-1, and the piezometric water level could help to constrain the rate of depletion and displacements in the basin. Combining these remote sensing techniques provides an independent tool for water management in areas where in-situ data are scarce. the subsidence rate is estimated to be >5 cm/year and has increased to 30 cm/year in local regions based on the interferometric synthetic aperture radar (InSAR) technique [11]. This research investigates whether the aquifers in the TEB are suffering inelastic compaction due to the massive groundwater extraction, the decline of water levels, and the progressive drought in recent years.We address this question by first providing evidence for the groundwater depletion and land subsidence in the TEB. Then, we prove that such subsidence is related to the rapid extraction of the groundwater in recent years. The impetus for this investigation is the scarcity of real in-situ data, including piezometric water levels and sufficient subsidence monitoring systems (e.g., levelling systems and the Global Positioning System (GPS)). To overcome this issue, we combine information from the geodetic satellites (Gravity Recovery and Climate Experiment (GRACE) and Sentinel-1) with Global Hydrological Models (GHMs) to better understand the changes in groundwater storage (GWS) and explore the climate and human-driven depletion in the basin.GRACE is sensitive to the total mass variation based on temporal changes of the gravity field [12]. Thus, it can provide the changes and trends of GWS with the help of GHMs. Sentinel-1 satellites offer a tool to estimate the crustal deformations at the millimeter scale, which can be seen as a change of the hydraulic head in aquifer regions. We used the Small Baseline Subset Interferometric Synthetic Aperture Radar (SBAS-InSAR) [13] for data from the Sentinel-1 satellite between 2015 and 2018 to resolve the temporal and spatial subsidies in the central part of TEB. To determine the relationship between the depletion and land subsidenc...

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Anatomy of Subsidence in Tianjin from Time Series InSAR

Cited by 36 publications

References 59 publications

Spatial Variability of Relative Sea-Level Rise in Tianjin, China: Insight From InSAR, GPS, and Tide-Gauge Observations

Spatial Variability of Relative Sea-Level Rise in Tianjin, China: Insight From InSAR, GPS, and Tide-Gauge Observations

Monitoring Differential Subsidence along the Beijing–Tianjin Intercity Railway with Multiband SAR Data

Quantifying Vertical Deformation in the Tigris–Euphrates Basin Due to the Groundwater Abstraction: Insights from GRACE and Sentinel-1 Satellites

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