DOI: 10.5194/hess-18-4951-2014
Scopus记录号: 2-s2.0-84916887114
论文题名: Using 14C and 3H to understand groundwater flow and recharge in an aquifer window
作者: Atkinson A ; P ; , Cartwright I ; , Gilfedder B ; S ; , Cendón D ; I ; , Unland N ; P ; , Hofmann H
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 12 起始页码: 4951
结束页码: 4964
语种: 英语
Scopus关键词: Aquifers
; Chlorine compounds
; Digital storage
; Electric conductivity
; Groundwater flow
; Groundwater resources
; Hydrochemistry
; Isotopes
; Landforms
; Recharging (underground waters)
; Sustainable development
; Chloride concentrations
; Continuous monitoring
; Electrical conductivity
; Environmental isotopes
; Groundwater elevations
; Groundwater residence
; Southeast australia
; Sustainable management
; Groundwater geochemistry
; aquifer
; carbon isotope
; chlorine
; concentration (composition)
; data set
; electrical conductivity
; hydrogen isotope
; oxygen isotope
; recharge
; sustainable development
; water flow
; water management
; water resource
; water table
; Australia
英文摘要: Knowledge of groundwater residence times and recharge locations is vital to the sustainable management of groundwater resources. Here we investigate groundwater residence times and patterns of recharge in the Gellibrand Valley, southeast Australia, where outcropping aquifer sediments of the Eastern View Formation form an "aquifer window" that may receive diffuse recharge from rainfall and recharge from the Gellibrand River. To determine recharge patterns and groundwater flow paths, environmental isotopes (3H, 14C, ?13C, ?18O, δ2H) are used in conjunction with groundwater geochemistry and continuous monitoring of groundwater elevation and electrical conductivity. The water table fluctuates by 0.9 to 3.7 m annually, implying recharge rates of 90 and 372 mm yr-1. However, residence times of shallow (11 to 29 m) groundwater determined by 14C are between 100 and 10 000 years, 3H activities are negligible in most of the groundwater, and groundwater electrical conductivity remains constant over the period of study. Deeper groundwater with older 14C ages has lower ?18O values than younger, shallower groundwater, which is consistent with it being derived from greater altitudes. The combined geochemistry data indicate that local recharge from precipitation within the valley occurs through the aquifer window, however much of the groundwater in the Gellibrand Valley predominantly originates from the regional recharge zone, the Barongarook High. The Gellibrand Valley is a regional discharge zone with upward head gradients that limits local recharge to the upper 10 m of the aquifer. Additionally, the groundwater head gradients adjacent to the Gellibrand River are generally upwards, implying that it does not recharge the surrounding groundwater and has limited bank storage. 14C ages and Cl concentrations are well correlated and Cl concentrations may be used to provide a first-order estimate of groundwater residence times. Progressively lower chloride concentrations from 10 000 years BP to the present day are interpreted to indicate an increase in recharge rates on the Barongarook High. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78053
Appears in Collections: 气候变化事实与影响
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作者单位: School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC, Australia; National Centre for Groundwater Research and Training, Flinders University, Adelaide, SA, Australia; Department of Hydrology, University of Bayreuth, Bayreuth, Germany; Australian Nuclear Science and Technology Organisation, Menai, NSW, Australia; School of Biological Earth and Environmental Sciences, University of New South Wales, Sydney, NSW, Australia; School of Earth Sciences, University of Queensland, Brisbane, QLD, Australia
Recommended Citation:
Atkinson A,P,, Cartwright I,et al. Using 14C and 3H to understand groundwater flow and recharge in an aquifer window[J]. Hydrology and Earth System Sciences,2014-01-01,18(12)