Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/1268
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dc.contributor.authorHancock, Peter Jen
dc.contributor.authorBoulton, Andrew Johnen
dc.date.accessioned2009-05-01T10:59:00Z-
dc.date.issued2005-
dc.identifier.citationHydrobiologia, 552(1), p. 75-85en
dc.identifier.issn1573-5117en
dc.identifier.issn0018-8158en
dc.identifier.urihttps://hdl.handle.net/1959.11/1268-
dc.description.abstractEnvironmental flow releases have been advocated as a useful rehabilitation strategy for improving river condition but assessments of their success have typically focused on surface water quality and biota. In this study, we investigated the impacts of an environmental flow release on water temperature, conductivity, dissolved oxygen, and nitrate concentrations in surface and subsurface (hyporheic) water at upwelling an downwelling zones in three sites along the Hunter, River, New South Wales, Australia. We hypothesised that the flow pulse would 'flush' the sediments with oxygenated water, stimulating hyporheic microbial activity and nitrification, enhancing nitrate concentrations over time. Surface and subsurface samples were collected before, 7 days after, and 49 days after an environmental flow release of 5000 Ml for a period of 3 days. no lasting effects on dissolved oxygen or conductivity were evident at most sites although dissolved oxygen declined over time at the downwelling site at Bowmans Crossing. At the downwelling zones at all sites, hyporheic nitrate concentrations declined initially following the release, but then rose or levelled off by Day 49. This initial drop in concentration was attributed to flushing of nitrate from the sediments. At two sites, nitrate concentrations had increased by Day 49 in the upwelling zones while at the third site, it fell significantly, associated with very low dissolved oxygen and likely reductive loss of nitrate. Electrical conductivity data indicate that potential inputs of agriculturally enriched groundwater may contribute to the nitrogen dynamics of the Hunter River. This study highlights the spatial heterogeneity that occurs in the hyporheic zone within and among sites of a regulated river, and emphasises the need for multiple-site surveys and an understanding of groundwater dynamics to assess physicochemical responses of the hyporheic zine to environmental flow releases.en
dc.languageenen
dc.publisherSpringer Netherlandsen
dc.relation.ispartofHydrobiologiaen
dc.titleThe effects of an environmental flow release on water quality in the hyporheic zone of the Hunter River, Australiaen
dc.typeJournal Articleen
dc.identifier.doi10.1007/s10750-005-1506-5en
dc.subject.keywordsEnvironmental Managementen
local.contributor.firstnamePeter Jen
local.contributor.firstnameAndrew Johnen
local.subject.for2008050205 Environmental Managementen
local.subject.seo779902 Land and water managementen
local.profile.schoolAdministrationen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailphancoc2@une.edu.auen
local.profile.emailaboulton@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordpes:2224en
local.publisher.placeNetherlandsen
local.format.startpage75en
local.format.endpage85en
local.identifier.scopusid27644543108en
local.peerreviewedYesen
local.identifier.volume552en
local.identifier.issue1en
local.contributor.lastnameHancocken
local.contributor.lastnameBoultonen
dc.identifier.staffune-id:phancoc2en
dc.identifier.staffune-id:aboultonen
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:1296en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleThe effects of an environmental flow release on water quality in the hyporheic zone of the Hunter River, Australiaen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorHancock, Peter Jen
local.search.authorBoulton, Andrew Johnen
local.uneassociationUnknownen
local.identifier.wosid000233567800007en
local.year.published2005en
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