Hydrochemical apportioning of irrigation groundwater sources in an alluvial aquifer

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dc.contributor.authorScheiber, Len_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorIverach, CPen_AU
dc.contributor.authorHankin, SIen_AU
dc.contributor.authorVázquez-Suñé, Een_AU
dc.contributor.authorKelly, BFJen_AU
dc.date.accessioned2021-11-18T23:14:45Zen_AU
dc.date.available2021-11-18T23:14:45Zen_AU
dc.date.issued2020-11-20en_AU
dc.date.statistics2021-10-13en_AU
dc.description.abstractRiver floodplains sustain irrigated agriculture worldwide. Despite generalised groundwater level falls, limited hard data are available to apportion groundwater sources in many irrigated regions. In this paper, we propose a workflow based on: hydrochemical analysis, water stable isotopes, radiocarbon contents and multivariate statistical analysis to facilitate the quantification of groundwater source attribution at regional scales. Irrigation water supply wells and groundwater monitoring wells sampled in the alluvial aquifer of the Condamine River (Queensland, Australia) are used to test this approach that can easily be implemented in catchments worldwide. The methodology identified four groundwater sources: 1) river/flood water; 2) modified river/flood water; 3) groundwater recharged through regional volcanic materials and 4) groundwater recharged predominantly through sands and/or sandstone materials. The first two sources are characterised by fresh water, dominant sodium bicarbonate chemistry, short residence time and depleted water stable isotope signatures. Groundwater sources 3 and 4 are characterised by saline groundwater, sodium chloride chemistries, enriched water stable isotopes and very low radiocarbon contents, inferred to correspond to long residence times. The majority of wells assessed are dominated by flood water recharge, linked to decadal >300 mm rainfall events and associated flooding in the region. The approach presented here provides a groundwater source fingerprint, reinforcing the importance of floodwater recharge in the regional water budgets. This apportioning of groundwater sources will allow irrigators, modelers and managers to assess the long-term sustainability of groundwater use in alluvial catchments. Crown Copyright © 2020 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND licenceen_AU
dc.identifier.articlenumber140506en_AU
dc.identifier.citationScheiber, L., Cendón, D. I., Iverach, C. P., Hankin, S. I., Vázquez-Suñé, E., & Kelly, B. F. J. (2020). Hydrochemical apportioning of irrigation groundwater sources in an alluvial aquifer. Science of The Total Environment, 744, 140506. doi:10.1016/j.scitotenv.2020.140506en_AU
dc.identifier.issn0048-9697en_AU
dc.identifier.journaltitleScience of The Total Environmenten_AU
dc.identifier.urihttps://doi.org/10.1016/j.scitotenv.2020.140506en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12272en_AU
dc.identifier.volume744en_AU
dc.language.isoenen_AU
dc.publisherElsevier B. V.en_AU
dc.subjectGround wateren_AU
dc.subjectMultivariate analysisen_AU
dc.subjectStatisticsen_AU
dc.subjectFloodsen_AU
dc.subjectStable isotopesen_AU
dc.subjectHydrologyen_AU
dc.subjectAustraliaen_AU
dc.subjectDataen_AU
dc.subjectIrrigationen_AU
dc.subjectVolcanic regionsen_AU
dc.subjectSandstonesen_AU
dc.subjectQueenslanden_AU
dc.subjectRainen_AU
dc.subjectWatershedsen_AU
dc.titleHydrochemical apportioning of irrigation groundwater sources in an alluvial aquiferen_AU
dc.typeJournal Articleen_AU
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