Residence times and mixing of water in river banks: implications for recharge and groundwater–surface water exchange

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dc.contributor.authorUnland, NPen_AU
dc.contributor.authorCartwright, Ien_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorChisari, Ren_AU
dc.date.accessioned2016-11-17T05:27:29Zen_AU
dc.date.available2016-11-17T05:27:29Zen_AU
dc.date.issued2014-12-12en_AU
dc.date.statistics2016-10-17en_AU
dc.description.abstractBank exchange processes within 50 m of the Tambo River, southeast Australia, have been investigated through the combined use of 3H and 14C. Groundwater residence times increase towards the Tambo River, which suggests the absence of significant bank storage. Major ion concentrations and δ2H and δ18O values of bank water also indicate that bank infiltration does not significantly impact groundwater chemistry under baseflow and post-flood conditions, suggesting that the gaining nature of the river may be driving the return of bank storage water back into the Tambo River within days of peak flood conditions. The covariance between 3H and 14C indicates the leakage and mixing between old (~17 200 years) groundwater from a semi-confined aquifer and younger groundwater (<100 years) near the river, where confining layers are less prevalent. It is likely that the upward infiltration of deeper groundwater from the semi-confined aquifer during flooding limits bank infiltration. Furthermore, the more saline deeper groundwater likely controls the geochemistry of water in the river bank, minimising the chemical impact that bank infiltration has in this setting. These processes, coupled with the strongly gaining nature of the Tambo River are likely to be the factors reducing the chemical impact of bank storage in this setting. This study illustrates the complex nature of river groundwater interactions and the potential downfall in assuming simple or idealised conditions when conducting hydrogeological studies.© Author(s) 2014. CC Attribution 3.0 License.en_AU
dc.identifier.citationUnland, N. P., Cartwright, I., Cendon, D. I., & Chisari, R. (2014). Residence times and mixing of water in river banks: implications for recharge and groundwater-surface water exchange. Hydrology and Earth System Sciences, 18(12), 5109-5124. doi:10.5194/hess-18-5109-2014en_AU
dc.identifier.govdoc7641en_AU
dc.identifier.issn1607-7938en_AU
dc.identifier.issue12en_AU
dc.identifier.journaltitleHydrology and Earth System Sciencesen_AU
dc.identifier.pagination5109-5124en_AU
dc.identifier.urihttp://dx.doi.org/10.5194/hess-18-5109-2014en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8097en_AU
dc.identifier.volume18en_AU
dc.language.isoenen_AU
dc.publisherCopernicus Publicationsen_AU
dc.subjectAustraliaen_AU
dc.subjectSurface watersen_AU
dc.subjectGround wateren_AU
dc.subjectAquifersen_AU
dc.subjectHydrologyen_AU
dc.subjectFloodsen_AU
dc.subjectRiversen_AU
dc.subjectWater influxen_AU
dc.subjectGeochemistryen_AU
dc.titleResidence times and mixing of water in river banks: implications for recharge and groundwater–surface water exchangeen_AU
dc.typeJournal Articleen_AU
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