Evaporative isotope enrichment as a constraint on reach water balance along a dryland river

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dc.contributor.authorGibson, JJen_AU
dc.contributor.authorSadek, MAen_AU
dc.contributor.authorStone, DJMen_AU
dc.contributor.authorHughes, CEen_AU
dc.contributor.authorHankin, SIen_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorHollins, SEen_AU
dc.date.accessioned2008-04-23T03:07:05Zen_AU
dc.date.accessioned2010-04-30T05:03:22Zen_AU
dc.date.available2008-04-23T03:07:05Zen_AU
dc.date.available2010-04-30T05:03:22Zen_AU
dc.date.issued2008-03en_AU
dc.date.statistics2008-03en_AU
dc.description.abstractDeuterium and oxygen-18 enrichment in river water during its transit across dryland region is found to occur systematically along evaporation lines with slopes of close to 4 in H-2-O-18 space, largely consistent with trends predicted by the Craig-Gordon model for an open-water dominated evaporating system. This, in combination with reach balance assessments and derived runoff ratios, strongly suggests that the enrichment signal and its variability in the Barwon-Darling river, Southeastern Australia is acquired during the process of evaporation from the river channel itself, as enhanced by the presence of abundant weirs, dams and other storages, rather than reflecting inherited enrichment signals from soil water evaporation in the watershed. Using a steady-state isotope mass balance analysis based on monthly O-18 and H-2, we use the isotopic evolution of river water to re-construct a perspective of net exchange between the river and its contributing area along eight reaches of the river during a drought period from July 2002 to December 2003, including the duration of a minor flow event. The resulting scenario, which uses a combination of climatological averages and available real-time meteorological data, should be viewed as a preliminary test of the application rather than as a definitive inventory of reach water balance. As expected for a flood-driven dryland system, considerable temporal variability in exchange is predicted. While requiring additional real-time isotopic data for operational use, the method demonstrates potential as a non-invasive tool for detecting and quantifying water diversions, one that can be easily incorporated within existing water quality monitoring activities. © 2008, Taylor & Francis Ltd.en_AU
dc.identifier.citationGibson, J. J., Sadek, M. A., Stone, D. J. M., Hughes, C. E., Hankin, S., Cendón, D. I., & Hollins, S. E. (2008). Evaporative isotope enrichment as a constraint on reach water balance along a dryland river. Presentation to the International workshop on the Isotope Effects in Evaporation (IWIEE) - Revisiting the Craig-Gordon model four decades after its elaboration - May 3 to 5. Pisa, Italy. In Isotopes in Environmental and Health Studies, 44(1), 83-98. doi:10.1080/10256010801887489en_AU
dc.identifier.conferenceenddate5 May 2008en_AU
dc.identifier.conferencenameInternational workshop on the Isotope Effects in Evaporation (IWIEE) - Revisiting the Craig-Gordon model four decades after its elaborationen_AU
dc.identifier.conferenceplacePisa, Italyen_AU
dc.identifier.conferencestartdate3 May 2008en_AU
dc.identifier.govdoc1217en_AU
dc.identifier.issn1025-6016en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleIsotopes in Environmental and Health Studiesen_AU
dc.identifier.pagination83-98en_AU
dc.identifier.urihttp://dx.doi.org/10.1080/10256010801887489en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1111en_AU
dc.identifier.volume44en_AU
dc.language.isoenen_AU
dc.publisherTaylor & Francisen_AU
dc.subjectEvaporationen_AU
dc.subjectIsotopesen_AU
dc.subjectWateren_AU
dc.subjectEnrichmenten_AU
dc.subjectRiversen_AU
dc.subjectIsotope separationen_AU
dc.titleEvaporative isotope enrichment as a constraint on reach water balance along a dryland riveren_AU
dc.typeConference Abstracten_AU
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