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Land subsidence and uplift related to groundwater extraction in Wuxi, China

Wang Guangya, Zhu Jinqi, Zhang Dan, Wu Jianqiang, Yu Jun, Gong Xulong and Gou Fugang
Land subsidence and uplift related to groundwater extraction in Wuxi, China
Quarterly Journal of Engineering Geology and Hydrogeology (March 2020) 53 (4): 609-619

Abstract

Wuxi City is located in the Yangtze River Delta region, China, it is underlain by a multi-layered aquifer system in the Quaternary porous deposits. Groundwater extraction mainly from the second confined aquifer (CA2) has led to severe regional land subsidence. The ground surface started to recover due to the restriction and banning of groundwater pumping. This paper reports the results of long-term surveying, groundwater piezometric head (GPH) measuring, and ground surface deformation monitoring by levelling and borehole extensometer. The subsidence is attributed to the compression of both aquifer and aquitards in the porous strata. The spatial characteristics of subsidence are related not only to GPH distribution, but also to the thickness and compressibility of different strata, as well as distance from the pumped aquifer, and pumping distribution. There was a temporal lag in the subsidence compared with the groundwater drawdown. The land uplift can be related to a period of recovery following the peak pumping period and groundwater recovery subsequent to the restriction and/or banning of groundwater pumping. The uplift was less than 10 mm under these two conditions, although the GPH had recovered more than 40% of the previous maximum at Qianzhou borehole extensometer station (QBES).


ISSN: 1470-9236
EISSN: 2041-4803
Serial Title: Quarterly Journal of Engineering Geology and Hydrogeology
Serial Volume: 53
Serial Issue: 4
Title: Land subsidence and uplift related to groundwater extraction in Wuxi, China
Affiliation: Geological Survey of Jiangsu Province, Laboratory of Earth Fissures Geological Disaster, Nanjin, China
Pages: 609-619
Published: 20200317
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 28
Accession Number: 2020-039340
Categories: Engineering geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch maps
N30°45'00" - N35°00'00", E116°30'00" - E122°00'00"
Secondary Affiliation: Nanjing University, CHN, China
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 202025
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