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Deformation of the aquifer system under groundwater level fluctuations and its implication for land subsidence control in the Tianjin coastal region
Yang, Jilong1,2; Cao, Guoliang3; Han, Dongmei4,5; Yuan, Haifan1,2; Hu, Yunzhuang1,2; Shi, Peixin1,2; Chen, Yongsheng1,2
2019-03-01
Source PublicationENVIRONMENTAL MONITORING AND ASSESSMENT
ISSN0167-6369
Volume191Issue:3Pages:14
Corresponding AuthorHan, Dongmei(handm@igsnrr.ac.cn)
AbstractThis study demonstrates characteristics and mechanisms of deformation of an aquifer system in response to seasonal fluctuations of groundwater level when groundwater pumping has been strictly regulated after experiencing longtime land subsidence. Two boreholes with depth of 1226m (G2 site) and 905m (G3 site) were drilled at the Tianjin coastal region where severe land subsidence had occurred since the 1950s. Extensometer/piezometer groups installed at the G2 site illustrate synchronized variations of compaction and groundwater level since 2010 in the aquifer system between depth of 100-400m which contributes most groundwater pumpage. Monitored land subsidence demonstrates that the shallow aquifer has become the main contributor to the land subsidence, and inelastic compaction still occurred in the aquifers where groundwater level has recovered. Pre-consolidation stresses show that clayey soils in depth <100m are under-consolidated, and deep clayey soils show the state of normal- to over-consolidation. The effects of the cyclic groundwater level oscillation on deformation were investigated using repeated loading and unloading tests. Void ratio changes in loading/unloading cycles illustrate that inelastic deformation rate decreases gradually and elastic deformation rate remains almost unchanged with increases of cyclic numbers. The deformation of soil samples from 100 to 400m is mostly elastic for loading stress in the over-consolidation stress range. These findings suggest that groundwater dewatering in the shallow (depth <100m) aquifer will be the primary target to control land subsidence. Groundwater level fluctuations higher than pre-consolidation value in 100-400m only lead to elastic and recoverable deformation even small residual permanent deformation may continue for a long time. The results improve the understanding of deformation in complex urban aquifers affected by groundwater level fluctuations and highlight the importance of city planning management for controlling land subsidence in coastal cities.
KeywordTianjin coastal region Clayey soil Elastic inelastic deformation Land subsidence
DOI10.1007/s10661-019-7296-4
WOS KeywordVALLEY ; CONSOLIDATION ; PERMEABILITY ; MANAGEMENT ; WITHDRAWAL ; CALIFORNIA ; BEHAVIOR ; UPLIFT ; BASIN ; CLAY
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2016YFE0102400] ; China Geological Survey Project[121201006000182401] ; China Geological Survey Project[121201006000150009]
Funding OrganizationNational Key R&D Program of China ; China Geological Survey Project
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000458859400002
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/49394
Collection中国科学院地理科学与资源研究所
Corresponding AuthorHan, Dongmei
Affiliation1.China Geol Survey, Tianjin Ctr, Tianjin 300170, Peoples R China
2.CGS Key Lab Muddy Coast Geoenvironm, Tianjin 300170, Peoples R China
3.China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100038, Peoples R China
4.Chinese Acad Sci, Key Lab Water Cycle & Related Land Surface Proc, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
5.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Yang, Jilong,Cao, Guoliang,Han, Dongmei,et al. Deformation of the aquifer system under groundwater level fluctuations and its implication for land subsidence control in the Tianjin coastal region[J]. ENVIRONMENTAL MONITORING AND ASSESSMENT,2019,191(3):14.
APA Yang, Jilong.,Cao, Guoliang.,Han, Dongmei.,Yuan, Haifan.,Hu, Yunzhuang.,...&Chen, Yongsheng.(2019).Deformation of the aquifer system under groundwater level fluctuations and its implication for land subsidence control in the Tianjin coastal region.ENVIRONMENTAL MONITORING AND ASSESSMENT,191(3),14.
MLA Yang, Jilong,et al."Deformation of the aquifer system under groundwater level fluctuations and its implication for land subsidence control in the Tianjin coastal region".ENVIRONMENTAL MONITORING AND ASSESSMENT 191.3(2019):14.
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