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A scenario-based approach to evaluating potential environmental impacts following a tidal barrage installation

Kidd, Ian M., Fischer, Andrew, Chai, Shuhong and Davis, Jenny A. (2015). A scenario-based approach to evaluating potential environmental impacts following a tidal barrage installation. Ocean and Coastal Management,116(November):9-19.

Document type: Journal Article
Citation counts: Altmetric Score Altmetric Score is 2
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IRMA ID 81144320xPUB203
Title A scenario-based approach to evaluating potential environmental impacts following a tidal barrage installation
Author Kidd, Ian M.
Fischer, Andrew
Chai, Shuhong
Davis, Jenny A.
Journal Name Ocean and Coastal Management
Publication Date 2015
Volume Number 116
Issue Number November
ISSN 0964-5691   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-84938508006
Start Page 9
End Page 19
Total Pages 11
Place of Publication United Kingdom
Publisher Elsevier Ltd
Field of Research ENVIRONMENTAL SCIENCES
HERDC Category C1 - Journal Article (DIISR)
Abstract Total exclusion barrages have a high impact on estuarine systems as they are permanent barriers to tidal flow. The environmental impacts of five putative barrages in various locations within the Tamar River estuary in northern Tasmania, Australia were assessed by considering likely hydrological, morphological and ecological outcomes. We found that all hypothetical barrages would produce downstream silt accretion, some to the point where a major port would become unusable without ongoing dredging. The closer a barrage was located to the mouth of the estuary, the greater the loss of tidal prism, the lower the effect of flushing by floodwaters, and the greater the loss of estuarine biodiversity. Eradication of invasive rice grass (Spartina anglica) in the mid estuary is potentially a positive outcome, whilst constant headpond surface heights could cause bank erosion and subsidence. Loss of tidal wetlands would contravene the international treaties protecting the migratory waterbirds which use these habitats. Installation of a barrage at the uppermost location appears to represent the best trade-off between adverse impacts and increased recreational and visual amenity. Unfortunately, barrage installation at any site within the estuary fails to address the major anthropogenic stressors of reduced riverine inflows and tidal flushing. A wider sustainability analysis is needed in which the costs of meeting environmental, social and economic objectives are considered.
Keywords Total exclusion barrage
Remnant estuary
Tidal prism
Bathymetry
Migratory species
Morphology
DOI http://dx.doi.org/10.1016/j.ocecoaman.2015.06.016   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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Created: Tue, 26 Jul 2016, 12:42:33 CST