Please use this identifier to cite or link to this item:
Title: Evaporative isotope enrichment as a constraint on reach water balance along a dryland river
Authors: Gibson, JJ
Sadek, MA
Stone, DJM
Hughes, CE
Hankin, SI
Cendón, DI
Hollins, SE
Keywords: Evaporation
Isotope separation
Issue Date: Mar-2008
Publisher: Taylor & Francis
Citation: Gibson, 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. Selected papers of 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:10.1080/10256010801887489
Abstract: Deuterium 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.
Gov't Doc #: 1217
ISSN: 1025-6016
Appears in Collections:Conference Publications

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.