Can tributary in-flows improve the recovery of the dissolved organic carbon regime in a snowmelt river regulated by a large reservoir?

Rohlfs, AM; Mitrovic, SM; Williams, S; Coleman, D

Can tributary in-flows improve the recovery of the dissolved organic carbon regime in a snowmelt river regulated by a large reservoir?

Rohlfs, AM Mitrovic, SM Williams, S Coleman, D

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Publisher:: CSIRO PUBLISHING
Publication Type:: Journal Article
Citation:: Marine and Freshwater Research, 2016, 67, (9), pp. 1338-1345
Issue Date:: 2016-01-01

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Field	Value	Language
dc.contributor.author	Rohlfs, AM
dc.contributor.author	Mitrovic, SM
dc.contributor.author	Williams, S
dc.contributor.author	Coleman, D
dc.date.accessioned	2022-03-21T05:20:49Z
dc.date.available	2022-03-21T05:20:49Z
dc.date.issued	2016-01-01
dc.identifier.citation	Marine and Freshwater Research, 2016, 67, (9), pp. 1338-1345
dc.identifier.issn	1323-1650
dc.identifier.issn	1448-6059
dc.identifier.uri	http://hdl.handle.net/10453/155433
dc.description.abstract	Although tributary inputs can accelerate the recovery of many physical and chemical gradients below large reservoirs, their contribution to the dissolved organic carbon (DOC) regime in regulated rivers remains poorly studied. In some regulated tributaries, flow volumes can be manipulated, potentially influencing DOC supply to the main stem. The present study examines how tributary water diversion affects DOC supply to a snowmelt river regulated by large reservoirs. DOC concentration was measured at tributary and main stem sites, and tributary DOC export was estimated under different tributary flow-diversion scenarios. Significant, positive correlations between DOC concentration and discharge were absent directly below the dam, but were present in the unregulated tributary, and re-emerged below the tributary confluence. Irrespective of water-diversion practices, tributary in-flows reconnected the regulated main stem to a more variable DOC regime driven by catchment flushing processes. However, tributary water diversion dampened the tributary signal by reducing DOC pulse frequency and total DOC export to the regulated river. These aspects of the DOC regime may influence basal resource availability and ecosystem functioning in the regulated main stem. The present study illustrates how an ecologically valuable tributary function can be addressed and quantified to guide the management and rehabilitation of a regulated river system.
dc.language	English
dc.publisher	CSIRO PUBLISHING
dc.relation.ispartof	Marine and Freshwater Research
dc.relation.isbasedon	10.1071/MF14230
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Marine Biology & Hydrobiology
dc.title	Can tributary in-flows improve the recovery of the dissolved organic carbon regime in a snowmelt river regulated by a large reservoir?
dc.type	Journal Article
utslib.citation.volume	67
utslib.for	039901 Environmental Chemistry (incl. Atmospheric Chemistry)
utslib.for	0502 Environmental Science and Management
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	closed_access	*
dc.date.updated	2022-03-21T05:20:48Z
pubs.issue	9
pubs.publication-status	Published
pubs.volume	67
utslib.citation.issue	9

Abstract:

Although tributary inputs can accelerate the recovery of many physical and chemical gradients below large reservoirs, their contribution to the dissolved organic carbon (DOC) regime in regulated rivers remains poorly studied. In some regulated tributaries, flow volumes can be manipulated, potentially influencing DOC supply to the main stem. The present study examines how tributary water diversion affects DOC supply to a snowmelt river regulated by large reservoirs. DOC concentration was measured at tributary and main stem sites, and tributary DOC export was estimated under different tributary flow-diversion scenarios. Significant, positive correlations between DOC concentration and discharge were absent directly below the dam, but were present in the unregulated tributary, and re-emerged below the tributary confluence. Irrespective of water-diversion practices, tributary in-flows reconnected the regulated main stem to a more variable DOC regime driven by catchment flushing processes. However, tributary water diversion dampened the tributary signal by reducing DOC pulse frequency and total DOC export to the regulated river. These aspects of the DOC regime may influence basal resource availability and ecosystem functioning in the regulated main stem. The present study illustrates how an ecologically valuable tributary function can be addressed and quantified to guide the management and rehabilitation of a regulated river system.

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http://hdl.handle.net/10453/155433