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Modelling morphological changes and migration of large sand waves in a very energetic tidal environment: Banks Strait, Australia

Citation

Auguste, C and Marsh, P and Nader, J-R and Penesis, I and Cossu, R, Modelling morphological changes and migration of large sand waves in a very energetic tidal environment: Banks Strait, Australia, Energies, 14, (13) Article 3943. ISSN 1996-1073 (2021) [Refereed Article]


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Copyright 2021 by the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3390/en14133943

Abstract

Banks Strait, Tasmania, Australia, has been identified as a potential site for the deployment of tidal turbines. In this study, the characterization of sediment transport and large sand waves for this site is performed. Observations of bed level change collected from surveys in 2018 showed a migration of large sand waves over a period of nine months. Migration rates in an excess of one hundred meters for nine months were found, which are large compared to the rate reported at other coastal sites, by several meters per year. A validated hydrodynamic model is coupled with a morphodynamic model to perform sensitivity tests and identify what parameters influence migration to better understand sediment dynamic in the Banks Strait. Numerical analysis showed a constant shift of the sand waves profile in an eastward direction, consistent with the observations. This migration was strongly linked with tidal asymmetry, with a residual current flowing towards the east. The principal parameters driving the migration of sand waves in the Banks Strait were found to be sediment sorting, bed friction and residual current. This study gives new insights for the seabed of Banks Strait and provides an assessment of the natural variability of sediment for futures tidal farms deployments.

Item Details

Item Type:Refereed Article
Keywords:sediment transport, sand waves migration, tidal energy, numerical modelling
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ocean engineering
Objective Division:Energy
Objective Group:Renewable energy
Objective Field:Tidal energy
UTAS Author:Auguste, C (Miss Christelle Auguste)
UTAS Author:Marsh, P (Mr Philip Marsh)
UTAS Author:Nader, J-R (Dr Jean-Roch Nader)
UTAS Author:Penesis, I (Professor Irene Penesis)
ID Code:145323
Year Published:2021
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2021-07-15
Last Modified:2021-09-21
Downloads:0

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