DOI: 10.1002/grl.50599
论文题名: The location of old groundwater in hydrogeologic basins and layered aquifer systems
作者: Gassiat C. ; Gleeson T. ; Luijendijk E.
刊名: Geophysical Research Letters
ISSN: 0094-8885
EISSN: 1944-8616
出版年: 2013
卷: 40, 期: 12 起始页码: 3042
结束页码: 3047
语种: 英语
英文关键词: aquifer systems
; groundwater age
; regional groundwater flow
; sedimentary basins
; subsurface hydrology
Scopus关键词: Aquifer systems
; Groundwater ages
; Regional groundwater flow
; Sedimentary basin
; Subsurface hydrology
; Aquifers
; Groundwater flow
; Groundwater resources
; Hydrogeology
; Radioactive waste disposal
; Topography
; Recharging (underground waters)
; aquifer characterization
; groundwater flow
; hydrogeology
; permeability
; recharge
; sedimentary basin
; solute transport
; subsurface flow
; waste disposal
英文摘要: The age of groundwater, the time since the water recharged the subsurface, is a fundamental characteristic of groundwater that impacts diverse geologic processes and practical applications. The distribution of groundwater age depends on many factors including permeability, recharge rate, aquifer geometry, and topography. Seminal work simulated topography-driven regional groundwater flow with various topographies, localized high-permeability zones, and more recently with permeability decreasing with depth, but the role of layered aquifer systems which are common in both consolidated and unconsolidated sediments has not been systematically explored. Here we show that high age zones with predictable locations occur in layered geologic systems across a wide range of hydraulic gradients, basin geometries, and permeabilities. Numerical simulations of a generic three-layer aquifer system indicate that high age zones consistently form in the low-permeability layer near the middle of the basin. The zones of older groundwater result from low groundwater velocities in the low-permeability layer and the rejuvenation of the groundwater through mixing of different flow paths near discharge zones. The high age zones are not hydraulic stagnation points but are associated with areas of low velocity. Formation and location of zones of high groundwater ages in low-permeability units are important as these units are targeted for radioactive waste disposal and shale gas extraction. High age zones are also likely to affect geologic processes that depend on groundwater or solute fluxes and may serve as archives of past hydrological or climatological conditions. Key Points High age zones with predictable locations occur in layered geologic systems High age zones occur across a wide range of hydrologic and geologic conditions ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880540237&doi=10.1002%2fgrl.50599&partnerID=40&md5=ff0ffe1d27fdae320dc85f9fafc27a35
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6149
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil Engineering, McGill University, Macdonald Engineering Bldg., 817 Sherbrooke St. W., Montréal, QC H3A 0C3, Canada
Recommended Citation:
Gassiat C.,Gleeson T.,Luijendijk E.. The location of old groundwater in hydrogeologic basins and layered aquifer systems[J]. Geophysical Research Letters,2013-01-01,40(12).