Solute and evaporation gradients formed by episodic river recharge over-time in a dryland aquifer

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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.authorGriffiths, ADen_AU
dc.date.accessioned2022-01-14T01:11:33Zen_AU
dc.date.available2022-01-14T01:11:33Zen_AU
dc.date.issued2015-11-03en_AU
dc.date.statistics2021-11-04en_AU
dc.description.abstractThe generally accepted hypothesis that river recharge forms the primary groundwater source in arid zone environments remains difficult to prove due to the remoteness and expense of studying these hydrologically complex systems in detail. Therefore we designed a study that would significantly advance our understanding of how a groundwater system is being recharged in a dryland region of the Darling River catchment, Australia. A range of hydrochemical and isotope tracers (Cl-, δ18O, δ2H, and 3H) measured in all components of the hydrological cycle were used in this multi-year study to understand and quantify groundwater recharge under wet and dry climatic conditions. The evaporation and concentration gradients observed in the unsaturated zone confirmed that small volumetric inputs from periodic rainfall were not the major recharge mechanism. Sampling which incorporated a large river recharge pulse from an overbank flooding event in March 2012 provided conclusive evidence for groundwater originating from high flow episodic river recharge. The use of long-term environmental data such as isotope records to understand how economically important water resources may respond to climate change with increasing temperatures and changing drought/flood regimes will be essential for future sustainability.en_AU
dc.identifier.citationMeredith, K., Hollins, S. E., Hughes, C. E., Cendón, D. I., & Griffiths, A. (2015). Solute and evaporation gradients formed by episodic river recharge over-time in a dryland aquifer. Paper presented to the Australian Groundwater Conference, The Shine Dome, Canberra, 3-5 November 2015, (pp. 57). Retrieved from: http://groundwater.com.au/documents/conference-program_2015.pdfen_AU
dc.identifier.conferenceenddate5 November 2015en_AU
dc.identifier.conferencenameAustralian Groundwater Conferenceen_AU
dc.identifier.conferenceplaceCanberra, Australiaen_AU
dc.identifier.conferencestartdate3 November 2015en_AU
dc.identifier.urihttp://groundwater.com.au/documents/conference-program_2015.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12674en_AU
dc.language.isoenen_AU
dc.publisherNational Centre for Groundwater Research And Trainingen_AU
dc.subjectRiversen_AU
dc.subjectAquifersen_AU
dc.subjectSamplingen_AU
dc.subjectGround wateren_AU
dc.subjectWatershedsen_AU
dc.subjectAustraliaen_AU
dc.subjectClimatesen_AU
dc.subjectDroughtsen_AU
dc.subjectFloodsen_AU
dc.subjectIsotopesen_AU
dc.subjectSustainabilityen_AU
dc.titleSolute and evaporation gradients formed by episodic river recharge over-time in a dryland aquiferen_AU
dc.typeConference Abstracten_AU
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