Effect of environmental flows on deep, anoxic pools

Coates, Michael J. and Mondon, Julie 2009, Effect of environmental flows on deep, anoxic pools, Ecological modelling, vol. 220, no. 13-14, pp. 1643-1651.

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Title Effect of environmental flows on deep, anoxic pools
Author(s) Coates, Michael J.
Mondon, Julie
Journal name Ecological modelling
Volume number 220
Issue number 13-14
Start page 1643
End page 1651
Total pages 9
Publisher Elsevier B.V.
Place of publication Amsterdam, The Netherlands
Publication date 2009-07-17
ISSN 0304-3800
1872-7026
Keyword(s) Environmenral flows
Flushing
Deep pool
anoxic
energy balance
Summary A series of field surveys were carried out on two permanent pools of the upper Glenelg River in SW Victoria, Australia. One was representative of the wider and deeper pools while the other was representative of the more-narrow and shallower pools. Both pools showed a typical seasonal cycle of warm, brackish, oxygen-poor, summer conditions and cool, oxygen-rich, low-salinity, winter conditions. The summer salinity increases were larger than expected, suggesting possible saline groundwater inflow from unidentified springs. Both pools contained anoxic water in their deeper sections but this was permanent only in the deeper pool. A simple model of the flushing rate of such anoxic pools subject to flows, such as environmental flow releases, was developed, based on an energy balance between the potential energy required to lift the anoxic layer and the kinetic energy derived from the river flow. The results were tested against and in agreement with the field measurements. The model also suggests that the anoxic layers are resilient to all but the largest environmental flows.
Language eng
Field of Research 060799 Plant Biology not elsewhere classified
Socio Economic Objective 960599 Ecosystem Assessment and Management not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2009
Copyright notice ©2009, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30021086

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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