Land subsidence lagging quantification in the main exploration aquifer layers in Beijing plain,China |
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| Institution: | 1. Earth Sciences Department of Sapienza University of Rome, p.le Aldo Moro 5, 00185 Rome, Italy;2. NHAZCA S.r.l. Spin-off of Sapienza University of Rome, via Cori snc, 00177 Rome, Italy;3. Lyle School of Civil Engineering, Purdue University, 550 Stadium Mall Drive West Lafayette, IN 47907, United States;4. Water Research Institute — National Research Council, Via Salaria 29, 300, 00015, Monterotondo Scalo, Rome, Italy;1. College of Geology Engineering and Geomatics, Chang''an University, No. 126 Yanta Road, Xi''an 710054, China;2. Key Laboratory of Western China''s Mineral Resources and Geological Engineering, Ministry of Education, No. 126 Yanta Road, Xi''an 710054, China;3. Department of Earth Sciences, Southern Methodist University, Dallas, TX 75275, USA;1. College of Geology Engineering and Geomatics, Chang''an University, No. 126 Yanta Road, Xi''an 710054, China;2. Key Laboratory of Western China''s Mineral Resources and Geological Engineering, Ministry of Education, No.126 Yanta Road, Xi''an 710054, China;3. Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China;1. Base of the State Key Laboratory of Urban Environmental Process and Digital Modeling, Capital Normal University, Beijing 100048, China;2. Key Laboratory of Resources Environment and GIS of Beijing Municipal, Capital Normal University, Beijing 100048, China;3. Beijing Laboratory of Water Resources Security, Capital Normal University, Beijing 100048, China;4. College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China |
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| Abstract: | Land subsidence is rapidly developing across the Beijing Plain, China. Long-term intense overexploitation of groundwater is the main reason for land subsidence in Beijing. In this study, an optimized Small Baseline Subset (SBAS) interferometry method was developed to process 46 RADATSAT-2 images from 2011 to 2015 to investigate the spatial and temporal dynamics of land subsidence in the Beijing Plain. The lag time between land subsidence and groundwater exploitation was first analyzed by the Continuous Wavelet Transform (CWT) and Cross Wavelet Transform (XWT) methods Our study found that the maximum subsidence rate reached 141 mm per year. The analysis of the areas and volumes of the annual subsidence rates indicated that the overall deformation trend slowed down from 2011 to 2015. Our results indicate that the subsidence center is always located in the southeast of Chaoyang District from 2011 to 2015. The lag time between the observed subsidence and the groundwater level drops in the main exploration aquifer layers was 0.57–1.76 months. This information is helpful to reveal the mechanism of land subsidence and build hydrogeological model. |
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| Keywords: | InSAR Land subsidence Groundwater Lag time |
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