Abstract
Abstract. Accurately assessing the impact of groundwater exploitation on land subsidence can provide scientific support for decision-makers. This article establishes a groundwater–subsidence model in a typical area using the land subsidence characteristics of Tongzhou, China, and subsequently classifies a land subsidence early warning zone based on the land subsidence rate. Results show that land subsidence occurred throughout the whole Tongzhou District. The land subsidence that developed to the west of Liuzhuang, Tongzhou city and Taihu was the most serious The maximum annual subsidence rate reached 120 mm a−1 under the current groundwater extraction conditions, and the early warning level for land subsidence reached its highest level. If the pumping of groundwater was reduced by 50 % in the second and the fourth aquifers and by 60 % in the third aquifer, the land subsidence early warning level would be largely reduced and would meet the requirements for land subsidence control.
Highlights
Land subsidence, which is a slowly developing geological disaster, has become a global geological problem characterized by a long duration, slow generation, a wide influence range, a complex mechanism, and great difficulty with respect to prevention and control (Martinez-Noguez and Hinkelmann, 2015) There are currently more than 60 countries and regions in the world suffering from land subsidence (Yuan et al, 2012)
UNESCO, IAHS and other groups have carried out a series of international research projects on land subsidence with research topics including monitoring land subsidence, the mechanism behind land subsidence and its prevention
This paper aims to establish an early warning mechanism with respect to land subsidence for disaster prediction and to reduce and control the multiple disasters induced by this phenomenon
Summary
Land subsidence, which is a slowly developing geological disaster, has become a global geological problem characterized by a long duration, slow generation, a wide influence range, a complex mechanism, and great difficulty with respect to prevention and control (Martinez-Noguez and Hinkelmann, 2015) There are currently more than 60 countries and regions in the world suffering from land subsidence (Yuan et al, 2012). Land subsidence has induced ground fissures in complex geological environments, including Shunyi and Changping, which have subsequently caused damage to infrastructure and reduced the value of land resources (Zhao et al, 2018b). Land subsidence reduces the ground elevation, causing the lifting, tilting and cracking of deep-water well pipes. It has threatened the operation of rail transit (Liu et al, 2016). This paper aims to establish an early warning mechanism with respect to land subsidence for disaster prediction and to reduce and control the multiple disasters induced by this phenomenon. L. Yong et al.: Land subsidence characteristics and disaster prevention in the Tongzhou area, Beijing
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