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Bathymetric rejuvenation strategies for morphologically degraded estuaries

Citation

Kidd, IM and Davis, J and Seward, M and Fischer, A, Bathymetric rejuvenation strategies for morphologically degraded estuaries, Ocean and Coastal Management, 142 pp. 98-110. ISSN 0964-5691 (2017) [Refereed Article]

Copyright Statement

Copyright 2017 Elsevier Ltd.

DOI: doi:10.1016/j.ocecoaman.2017.03.025

Abstract

Bathymetric adjustment of estuaries created by anthropogenic stressors is a common global issue. Typical stressors are tidal levees, jetties, infilling, barrages and flow redirection. Removal or alleviation of stressors should in part, reinstate previous conditions. Generic and site specific rehabilitation strategies were assessed using a simple regime model (FORM) for the excessively silted Tamar River estuary in Tasmania, Australia. The model calculated the net sediment adjustment resulting from each strategy and was applied to evaluate projects designed to mitigate previously identified stressors and two separate barrages. Results show that a combination of projects involving removal or mitigation of stressors potentially eroded >7 106m3 of silt over the study area whereas both barrages caused silt accretion, one potentially doubling the volume of silt accumulated since the early 1800s. It was concluded that a substantial rejuvenation of the estuary was possible utilising various strategies, including creating a tidal lake, removing tidal levees, reconstituting an old meander system, and creating an additional waterway, whilst mainly negative trade-offs would result from installation of a barrage. In a general sense, the recommended strategies would apply to similarly degraded estuaries elsewhere.

Item Details

Item Type:Refereed Article
Keywords:silt accretion, remediation, stressor, hydrodynamics, total exclusion barrage
Research Division:Environmental Sciences
Research Group:Environmental Science and Management
Research Field:Environmental Science and Management not elsewhere classified
Objective Division:Environment
Objective Group:Land and Water Management
Objective Field:Coastal and Estuarine Water Management
Author:Kidd, IM (Mr Ian Kidd)
Author:Fischer, A (Dr Andy Fischer)
ID Code:115664
Year Published:2017
Deposited By:Centre for Ecology and Biodiversity
Deposited On:2017-04-04
Last Modified:2017-11-21
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