Subsidence

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Chengsheng Yang - One of the best experts on this subject based on the ideXlab platform.

  • monitoring land Subsidence and fault deformation using the small baseline subset insar technique a case study in the datong basin china
    2014
    Co-Authors: Chengsheng Yang, Chaoying Zhao, Qin Zhang, Qingliang Wang
    Abstract:

    Abstract The Datong Basin is located to the north of the Fenwei Graben Basin, where ground fissures and Subsidence are common geological hazards. The Datong Basin is also one of China's main energy bases and is known as “the hometown of coal”. In this study, the small baseline subset InSAR technique was used to process 40 scenes of Envisat ASAR images that cover this area. The magnitude and distribution of Subsidence in the Datong Basin were obtained. Additionally, the relationships among the regional land Subsidence, ground fissures and fault activity were addressed. The results reveal that Datong ground Subsidence is affected by the groundwater exploitation and the nearby faults. The Datong ground fissures are controlled by regional fault activity (e.g., seismic activity) and its interaction with the ground Subsidence. Meanwhile, the influence of surface precipitation on ground fissure activity was analyzed. The differential Subsidence on both sides of the ground fissures was also studied.

  • Land Subsidence and ground fissures in Xi'an, China 2005-2012 revealed by multi-band InSAR time-series analysis
    2014
    Co-Authors: Feifei Qu, Chengsheng Yang, Chaoying Zhao, Zhong Lu, Qin Zhang, Jing Zhang
    Abstract:

    Xi'an, China has been undergoing significant land Subsidence along with ground fissure development. These geohazards have brought about severe damages to buildings, bridges and other facilities. In order to warn of and mitigate disasters, it is urgently necessary to obtain the latest rate, extent, and temporal evolution of land Subsidence in Xi'an. With multiple SAR datasets as well as leveling, GPS and ground water level of aquifers, we study and map the spatial and temporal evolution of land Subsidence and ground fissures over Xi'an. First, 62 synthetic aperture radar (SAR) images acquired by Envisat, ALOS, and TerrSAR-X during 2005-2012 are used to form three independent interferometric stacks to unveil the spatial and temporal variations of land Subsidence and ground fissures by using the time-series interferometric synthetic aperture radar (InSAR) technique. GPS and leveling measurements are applied to calibrate the InSAR results. Precision of our InSAR annual Subsidence results is less than 9. mm. We derive the east-west and vertical components of the observed land deformation in 2009 using descending and ascending InSAR observations, finding out that the horizontal component of land deformation cannot be ignored if the deformation is large or ground fissures are active. Second, four main land Subsidence zones are detected in Xi'an, with an average Subsidence rate of 50. mm/a during 2005-2012. Time-series InSAR results indicate that land Subsidence rates in Xi'an increased by 200% from 2005-2007 to 2008-2010, extending existing ground fissures. Third, InSAR-derived land Subsidence correlates with the change in ground water level, and seasonal variations in Subsidence correlate with changes in ground water pumping. Last, the consistency on the spatial-temporal distribution variation between ground fissures and land Subsidence could be drawn from the time series results and profile analysis. Shapes of subsiding zones follow the general trends of mapped ground fissures and main faults in an ENE direction. Changes in the Subsidence gradient are also observed over most of the ground fissures and faults. Subsidence-triggered fissures can cause localized surface displacements, aggravate localized Subsidence, discontinue the integrity of ground water flow, and limit the horizontal spread of Subsidence funnels. With continuing mass construction projects in Xi'an, monitoring ground deformation with satellite InSAR therefore can provide efficient means to image land Subsidence, movements of fissures and faults, and the associated geohazards.

Chunmiao Zheng - One of the best experts on this subject based on the ideXlab platform.

  • groundwater pumping optimization for land Subsidence control in beijing plain china
    2018
    Co-Authors: Charles Andrews, Fang Tia, Guoliang Cao, Yong Luo, Jiurong Liu, Chunmiao Zheng
    Abstract:

    Beijing, in the North China plain, is one of the few megacities that uses groundwater as its main source of water supply. Groundwater accounts for about two-thirds of the city’s water supply, and during the past 50 years the storage depletion from the unconsolidated aquifers underlying the city has been >10.4 billion m3. By 2010, groundwater pumping in the city had resulted in a cumulative Subsidence of greater than 100 mm in an area of about 3,900 km2, with a maximum cumulative Subsidence of >1,200 mm. This Subsidence has caused significant social and economic losses in Beijing, including significant damage to underground utilities. This study was undertaken to evaluate various future pumping scenarios to assist in selecting an optimal pumping scenario to minimize overall Subsidence, meet the requirements of the Beijing Land Subsidence Prevention Plan (BLSPP 2013–2020), and be consistent with continued sustainable economic development. A numerical groundwater and land-Subsidence model was developed for the aquifer system of the Beijing plain to evaluate land Subsidence rates under the possible future pumping scenarios. The optimal pumping scenario consistent with the evaluation constraints is a reduction in groundwater pumping from three major pumping centers by 100, 50 and 20%, respectively, while maintaining an annual pumping rate of 1.9 billion m3. This scenario’s land-Subsidence rates satisfy the BLSPP 2013–2020 and the pumping scenario is consistent with continued economic development. It is recommended that this pumping scenario be adopted for future land-Subsidence management in Beijing.

Paul R T Kuzyk - One of the best experts on this subject based on the ideXlab platform.

  • risk factors for Subsidence of a modular tapered femoral stem used for revision total hip arthroplasty
    2015
    Co-Authors: Suksan Tangsataporn, Oleg Safir, Alexander D Vincent, Hesham Abdelbary, Allan E Gross, Paul R T Kuzyk
    Abstract:

    Abstract The purpose of this study was to determine the incidence, and the clinical and radiographic risk factors for significant Subsidence of a cementless, modular tapered revision femoral stem. Femoral stem Subsidence of at least 10 mm or Subsidence requiring revision was considered significant Subsidence. Ninety-seven patients (99 hips) were included with minimum radiographic follow-up of one year (mean 34 months; range, 12–91 months). The mean stem Subsidence was 4.5 mm (range, 0–44 mm). Fourteen out of 99 (14.1%) stems had significant Subsidence and 6 (6.1%) stems required revision due to Subsidence. Patient weight greater than 80 kg ( P  = 0.04) and femoral stem press-fit distance of less than 2 cm ( P

Hesham Abdelbary - One of the best experts on this subject based on the ideXlab platform.

  • risk factors for Subsidence of a modular tapered femoral stem used for revision total hip arthroplasty
    2015
    Co-Authors: Suksan Tangsataporn, Oleg Safir, Alexander D Vincent, Hesham Abdelbary, Allan E Gross, Paul R T Kuzyk
    Abstract:

    Abstract The purpose of this study was to determine the incidence, and the clinical and radiographic risk factors for significant Subsidence of a cementless, modular tapered revision femoral stem. Femoral stem Subsidence of at least 10 mm or Subsidence requiring revision was considered significant Subsidence. Ninety-seven patients (99 hips) were included with minimum radiographic follow-up of one year (mean 34 months; range, 12–91 months). The mean stem Subsidence was 4.5 mm (range, 0–44 mm). Fourteen out of 99 (14.1%) stems had significant Subsidence and 6 (6.1%) stems required revision due to Subsidence. Patient weight greater than 80 kg ( P  = 0.04) and femoral stem press-fit distance of less than 2 cm ( P

Oleg Safir - One of the best experts on this subject based on the ideXlab platform.

  • risk factors for Subsidence of a modular tapered femoral stem used for revision total hip arthroplasty
    2015
    Co-Authors: Suksan Tangsataporn, Oleg Safir, Alexander D Vincent, Hesham Abdelbary, Allan E Gross, Paul R T Kuzyk
    Abstract:

    Abstract The purpose of this study was to determine the incidence, and the clinical and radiographic risk factors for significant Subsidence of a cementless, modular tapered revision femoral stem. Femoral stem Subsidence of at least 10 mm or Subsidence requiring revision was considered significant Subsidence. Ninety-seven patients (99 hips) were included with minimum radiographic follow-up of one year (mean 34 months; range, 12–91 months). The mean stem Subsidence was 4.5 mm (range, 0–44 mm). Fourteen out of 99 (14.1%) stems had significant Subsidence and 6 (6.1%) stems required revision due to Subsidence. Patient weight greater than 80 kg ( P  = 0.04) and femoral stem press-fit distance of less than 2 cm ( P