Temporal and Spatial Evolution of Land Subsidence Induced by Groundwater Exploitation and Construction in the Eastern Chaoyang District,Beijing, China |
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| Authors: | " target="_blank">Yuan Si " target="_blank">Beibei Chen " target="_blank">Huili Gong " target="_blank">Mingliang Gao |
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| Institution: | 1.Base of the State Key Laboratory of Urban Environmental Process and Digital Modelling,Capital Normal University,Beijing,China;2.Key Laboratory of 3D Information Acquisition and Application of Ministry of Education,Capital Normal University,Beijing,China;3.Beijing Laboratory of Water Resources Safety,Capital Normal University,Beijing,China;4.College of Resource Environment and Tourism,Capital Normal University,Beijing,China;5.Key Laboratory of Resources Environment and GIS of Beijing Municipal,Capital Normal University,Beijing,China |
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| Abstract: | Human activities have a large impact on land subsidence in great metropolitan areas. In this study, the RADARSAT-2 observation data over a 4-year period (from November 2010 to September 2014) is used to investigate the trends of land subsidence in the eastern Chaoyang District in Beijing, China, and to analyze the impact of human activities on it. The observation results indicate that the temporal and spatial evolutions trend of land subsidence in this area is uneven, with deformation rates ranging from ??116.52 to 7.1 mm/year. There are two large subsidence areas located in the northern part of the study area, and we find that the groundwater exploitation and deformation rates are strongly linearly correlated. The effect of construction on land subsidence has also been investigated. Over time, land subsidence is generally increased in the study area, with an exception at the Longfor Changying Galleria area, which is under construction during the observation period. Based on the time-series analysis of permanent scattered points in the 200 m buffer area, construction activities are observed to cause both land subsidence and upheaval deformation of the surrounding soil. During the construction period, the displacement of the surrounding soil is disturbed. After completion, the initial displacement of surrounding soil is tended to involve the uplift of the surrounding soil, followed by a gradual subsidence with time. |
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