DOI: 10.5194/hess-21-5953-2017
Scopus记录号: 2-s2.0-85032947407
论文题名: A multi-tracer approach to constraining artesian groundwater discharge into an alluvial aquifer
作者: Iverach C ; P ; , Cendón D ; I ; , Meredith K ; T ; , Wilcken K ; M ; , Hankin S ; I ; , Andersen M ; S ; , Kelly B ; F ; J
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 11 起始页码: 5953
结束页码: 5969
语种: 英语
Scopus关键词: Analytical geochemistry
; Aquifers
; Budget control
; Catchments
; Climate models
; Geochemistry
; Groundwater
; Groundwater resources
; Hydrochemistry
; Hydrogeology
; Isotopes
; Catchment water balance
; Conceptual frameworks
; Geochemical analysis
; Ground water discharge
; Multi-tracer approach
; Sustainable groundwater
; Water balance models
; Water stable isotopes
; Recharging (underground waters)
; aquifer
; artesian well
; concentration (composition)
; conceptual framework
; discharge
; geochemistry
; groundwater
; groundwater resource
; hydrological modeling
; resource allocation
; stable isotope
; tracer
; Australia
; Great Artesian Basin
英文摘要: Understanding pathways of recharge to alluvial aquifers is important for maintaining sustainable access to groundwater resources. Water balance modelling is often used to proportion recharge components and guide sustainable groundwater allocations. However, it is not common practice to use hydrochemical evidence to inform and constrain these models. Here we compare geochemical versus water balance model estimates of artesian discharge into an alluvial aquifer, and demonstrate why multi-tracer geochemical analyses should be used as a critical component of water budget assessments. We selected a site in Australia where the Great Artesian Basin (GAB), the largest artesian basin in the world, discharges into the Lower Namoi Alluvium (LNA), an extensively modelled aquifer, to convey the utility of our approach. Water stable isotopes and the concentrations of Na+ and HCO3g suggest a continuum of mixing in the alluvial aquifer between the GAB (artesian component) and surface recharge, whilst isotopic tracers (3H, 14C, and 36Cl) indicate that the alluvial groundwater is a mixture of groundwaters with residence times of 70 years and groundwater that is potentially hundreds of thousands of years old, which is consistent with that of the GAB. In addition, Clg concentrations provide a means to calculate a percentage estimate of the artesian contribution to the alluvial groundwater. In some locations, an artesian contribution of up to 70g is evident from the geochemical analyses, a finding that contrasts with previous regional-scale water balance modelling estimates that attributed 22g of all inflow for the corresponding zone within the LNA to GAB discharge. Our results show that hydrochemical investigations need to be undertaken as part of developing the conceptual framework of a catchment water balance model, as they can improve our understanding of recharge pathways and better constrain artesian discharge to an alluvial aquifer. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78985
Appears in Collections: 气候变化事实与影响
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作者单位: Connected Waters Initiative Research Centre, UNSW Sydney, Sydney, NSW, Australia; School of Biological, Earth and Environmental Sciences, UNSW Sydney, Sydney, NSW, Australia; Australian Nuclear Science and Technology Organisation, New Illawarra Rd, Lucas-Heights, NSW, Australia; School of Civil and Environmental Engineering, UNSW Sydney, Sydney, NSW, Australia
Recommended Citation:
Iverach C,P,, Cendón D,et al. A multi-tracer approach to constraining artesian groundwater discharge into an alluvial aquifer[J]. Hydrology and Earth System Sciences,2017-01-01,21(11)