δ2H and δ18O used to link flooding to groundwater recharge along the Darling River

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dc.contributor.authorHughes, CEen_AU
dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorBrodie, RSen_AU
dc.contributor.authorHollins, SEen_AU
dc.contributor.authorCendón, DIen_AU
dc.date.accessioned2022-01-27T01:06:01Zen_AU
dc.date.available2022-01-27T01:06:01Zen_AU
dc.date.issued2015-07-09en_AU
dc.date.statistics2022-01-11en_AU
dc.description.abstractUnderstanding where water goes during floods, how much is lost to evaporation, and how river waters exchange with groundwater are key areas underpinning science-based water resource management. The question of whether groundwater recharge, past and present, occurs diffusely via infiltration of rainfall, via river bank leakage or sporadically during flood events is important in evaluating groundwater sustainability. Stable isotopes of water, δ2H and δ180, are valuable tools in answering this question. Along the Barwon/Darling River, stable water isotope time series from both rainfall and river samples are proving useful in understanding recharge processes. Evaporative enrichment of infiltrating rainwater is expected to lead to groundwater having a lower d-excess than local rainwater, which can be cited as evidence of diffuse recharge. Generally floodwaters, by virtue of their origin in high rainfall events, are characterised by being more depleted in δ2H and δ180 than average flow or average rainfall. However this is highly variable both spatially and between events. Data from various sites along the Barwon/Darling River from Mungindi to Burtundy indicate evaporative enrichment of floodwater with time. At two locations where groundwater recharge has been studied in detail, Glen Villa (Meredith et al, in prep) and Menindee (Brodie et al, in prep), groundwater isotopes have been found to match the isotopic composition of flood waters during a 10 year time series from the Darling River. This relationship between flow rate and isotope composition provides evidence of flooding being the primary recharge mechanism in the lower Darling River. en_AU
dc.description.sponsorshipAustralian Nuclear Science and Technology Organisation (ANSTO)en_AU
dc.identifier.citationHughes, C. E., Meredith K., Brodie R. S., Hollins S. E., Cendón D. I. ((2015). δ2H and δ18O used to link flooding to groundwater recharge along the Darling River. Presentation to the 13th Australasian Environment Isotope Conference (AEIC), Sydney, 8-10th July 2015.en_AU
dc.identifier.conferenceenddate10 July 2015en_AU
dc.identifier.conferencename13th Australasian Environment Isotope Conference (AEIC)en_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate8 July 2015en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12734en_AU
dc.language.isoenen_AU
dc.publisherUniversity of New South Wales and Australian Nuclear Science and Technology Organisationen_AU
dc.subjectFloodsen_AU
dc.subjectGround wateren_AU
dc.subjectGroundwater rechargeen_AU
dc.subjectRiversen_AU
dc.subjectNew South Walesen_AU
dc.subjectAustraliaen_AU
dc.titleδ2H and δ18O used to link flooding to groundwater recharge along the Darling Riveren_AU
dc.typeConference Presentationen_AU
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