Evaporation and concentration gradients created by episodic river recharge in a semi-arid zone aquifer: Insights from Cl−, δ18O, δ2H, and 3H

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dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorHollins, SEen_AU
dc.contributor.authorHughes, CEen_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorChisari, Ren_AU
dc.contributor.authorGriffiths, ADen_AU
dc.contributor.authorCrawford, Jen_AU
dc.date.accessioned2021-03-04T05:14:34Zen_AU
dc.date.available2021-03-04T05:14:34Zen_AU
dc.date.issued2015-10en_AU
dc.date.statistics2020-03-04en_AU
dc.description.abstractThis study has significantly advanced our understanding of the origin of groundwater recharge in a semi-arid zone region of the Darling River catchment, Australia. The generally accepted hypothesis in arid zone environments in Australia that river water forms the primary groundwater recharge source has proven difficult to monitor. This is due to the time lags between large floods, the remoteness and expense of studying these hydrologically complex systems in detail. In addition, the highly episodic nature of dryland rivers complicates the interpretation of the groundwater signal. A range of hydrochemical tracers (chloride, oxygen-18, deuterium and tritium) measured in rain, river water, soil water and groundwater were used in this multi-year study to trace the pathways of groundwater recharge under wet and dry climatic conditions. The evaporation and Cl concentrations observed in the unsaturated zone confirmed that small volumetric inputs from periodic rainfall were not the major recharge mechanism. Sampling which included an overbank flooding event in March 2012 provided firm evidence for groundwater originating from high flow episodic river recharge. The use of long-term environmental data to understand how economically important water resources respond to climate change with increasing temperatures is considered essential for future sustainability. Crown Copyright ©2015 Published by Elsevier B.V.en_AU
dc.identifier.citationMeredith, K. T., Hollins, S. E., Hughes, C. E., Cendón, D. I., Chisari, R., Griffiths, A., & Crawford, J. (2015). Evaporation and concentration gradients created by episodic river recharge in a semi-arid zone aquifer: Insights from Cl−, δ18O, δ2H, and 3H. Journal of Hydrology, 529, 1070-1078. doi:10.1016/j.jhydrol.2015.09.025en_AU
dc.identifier.issn0022-1694en_AU
dc.identifier.journaltitleJournal of Hydrologyen_AU
dc.identifier.pagination1070-1078en_AU
dc.identifier.urihttps://doi.org/10.1016/j.jhydrol.2015.09.025en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10483en_AU
dc.identifier.volume529en_AU
dc.language.isoenen_AU
dc.publisherElsevier B. V.en_AU
dc.subjectRiversen_AU
dc.subjectGround wateren_AU
dc.subjectOxygenen_AU
dc.subjectDeuteriumen_AU
dc.subjectTritiumen_AU
dc.subjectGroundwater rechargeen_AU
dc.subjectArid landsen_AU
dc.subjectAustraliaen_AU
dc.subjectWatershedsen_AU
dc.subjectFloodsen_AU
dc.titleEvaporation and concentration gradients created by episodic river recharge in a semi-arid zone aquifer: Insights from Cl−, δ18O, δ2H, and 3Hen_AU
dc.typeJournal Articleen_AU
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