气候变化领域集成服务门户(CCPortal): A partially coupled hydro-mechanical analysis of the Bengal Aquifer System under hydrological loading

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DOI	10.5194/hess-23-2461-2019
	A partially coupled hydro-mechanical analysis of the Bengal Aquifer System under hydrological loading
	Woodman N.D.; Burgess W.G.; Ahmed K.M.; Zahid A.
发表日期	2019
ISSN	1027-5606
起始页码	2461
结束页码	2479
卷号	23 期号:5
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).
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
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159675
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
推荐引用方式 GB/T 7714	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],2019,23(5).
APA	Woodman N.D.,Burgess W.G.,Ahmed K.M.,&Zahid A..(2019).A partially coupled hydro-mechanical analysis of the Bengal Aquifer System under hydrological loading.Hydrology and Earth System Sciences,23(5).
MLA	Woodman N.D.,et al."A partially coupled hydro-mechanical analysis of the Bengal Aquifer System under hydrological loading".Hydrology and Earth System Sciences 23.5(2019).