DOI: 10.5194/hess-23-2461-2019
论文题名: A partially coupled hydro-mechanical analysis of the Bengal Aquifer System under hydrological loading
作者: Woodman N.D. ; Burgess W.G. ; Ahmed K.M. ; Zahid A.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期: 5 起始页码: 2461
结束页码: 2479
语种: 英语
Scopus关键词: Aquifers
; Digital storage
; Groundwater resources
; Hydrogeology
; Recharging (underground waters)
; Structural geology
; Water conservation
; Water levels
; Water management
; Coupled hydro mechanicals
; Ground water recharge
; Groundwater management
; Groundwater resources management
; Poroelastic behaviour
; Surface boundary conditions
; Terrestrial water storage
; Vertical deflections
; Loading
英文摘要: The coupled poro-mechanical behaviour of geologic-fluid systems is fundamental to numerous processes in structural geology, seismology, and geotechnics, but is frequently overlooked in hydrogeology. Substantial poro-mechanical influences on groundwater head have recently been highlighted in the Bengal Aquifer System, however, driven by terrestrial water loading across the Ganges-Brahmaputra-Meghna floodplains. Groundwater management in this strategically important fluvio-deltaic aquifer, the largest in southern Asia, requires a coupled hydro-mechanical approach which acknowledges poroelasticity. We present a simple partially coupled, 1-D poroelastic model of the Bengal Aquifer System, and explore the poro-mechanical responses of the aquifer to surface boundary conditions representing hydraulic head and mechanical load under three modes of terrestrial water variation. The characteristic responses, shown as amplitude and phase of hydraulic head in depth profile and of ground surface deflection, demonstrate (i) the limits to using water levels in piezometers to indicate groundwater recharge, as conventionally applied in groundwater resources management; (ii) the conditions under which piezometer water levels respond primarily to changes in the mass of terrestrial water storage, as applied in geological weighing lysimetry; (iii) the relationship of ground surface vertical deflection with changes in groundwater storage; and (iv) errors of attribution that could result from ignoring the poroelastic behaviour of the aquifer. These concepts are illustrated through application of the partially coupled model to interpret multi-level piezometer data at two sites in southern Bangladesh. There is a need for further research into the coupled responses of the aquifer due to more complex forms of surface loading, particularly from rivers. © 2019 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162965
Appears in Collections: 气候变化与战略
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作者单位: Woodman, N.D., Department of Earth Sciences, University College London, London, WC1E 6BT, United Kingdom, Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, United Kingdom; Burgess, W.G., Department of Earth Sciences, University College London, London, WC1E 6BT, United Kingdom; Ahmed, K.M., Department of Geology, Dhaka University, Dhaka, 1000, Bangladesh; Zahid, A., Bangladesh Water Development Board, Dhaka, Bangladesh
Recommended Citation:
Woodman N.D.,Burgess W.G.,Ahmed K.M.,et al. A partially coupled hydro-mechanical analysis of the Bengal Aquifer System under hydrological loading[J]. Hydrology and Earth System Sciences,2019-01-01,23(5)