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Modelling Morphological Changes and Migration of Large Sand Waves in a Very Energetic Tidal Environment: Banks Strait, Australia

Author

Listed:
  • Christelle Auguste

    (Australian Maritime College, University of Tasmania, Launceston, TAS 7250, Australia)

  • Philip Marsh

    (Australian Maritime College, University of Tasmania, Launceston, TAS 7250, Australia)

  • Jean-Roch Nader

    (Australian Maritime College, University of Tasmania, Launceston, TAS 7250, Australia)

  • Irene Penesis

    (Australian Maritime College, University of Tasmania, Launceston, TAS 7250, Australia)

  • Remo Cossu

    (School of Civil Engineering, University of Queensland, St Lucia, QLD 4072, Australia)

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.

Suggested Citation

  • Christelle Auguste & Philip Marsh & Jean-Roch Nader & Irene Penesis & Remo Cossu, 2021. "Modelling Morphological Changes and Migration of Large Sand Waves in a Very Energetic Tidal Environment: Banks Strait, Australia," Energies, MDPI, vol. 14(13), pages 1-30, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:13:p:3943-:d:586735
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    References listed on IDEAS

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    1. Nash, S. & Phoenix, A., 2017. "A review of the current understanding of the hydro-environmental impacts of energy removal by tidal turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 648-662.
    2. Marsh, P. & Penesis, I. & Nader, J.R. & Couzi, C. & Cossu, R., 2021. "Assessment of tidal current resources in Clarence Strait, Australia including turbine extraction effects," Renewable Energy, Elsevier, vol. 179(C), pages 150-162.
    3. Larissa Perez & Remo Cossu & Camille Couzi & Irene Penesis, 2020. "Wave-Turbulence Decomposition Methods Applied to Tidal Energy Site Assessment," Energies, MDPI, vol. 13(5), pages 1-21, March.
    4. Fairley, I. & Karunarathna, H. & Masters, I., 2018. "The influence of waves on morphodynamic impacts of energy extraction at a tidal stream turbine site in the Pentland Firth," Renewable Energy, Elsevier, vol. 125(C), pages 630-647.
    5. Auguste, Christelle & Nader, Jean-Roch & Marsh, Philip & Cossu, Remo & Penesis, Irene, 2021. "Variability of sediment processes around a tidal farm in a theoretical channel," Renewable Energy, Elsevier, vol. 171(C), pages 606-620.
    6. Neill, Simon P. & Jordan, James R. & Couch, Scott J., 2012. "Impact of tidal energy converter (TEC) arrays on the dynamics of headland sand banks," Renewable Energy, Elsevier, vol. 37(1), pages 387-397.
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    8. Cossu, Remo & Penesis, Irene & Nader, Jean-Roch & Marsh, Philip & Perez, Larissa & Couzi, Camille & Grinham, Alistair & Osman, Peter, 2021. "Tidal energy site characterisation in a large tidal channel in Banks Strait, Tasmania, Australia," Renewable Energy, Elsevier, vol. 177(C), pages 859-870.
    9. Perez, Larissa & Cossu, Remo & Grinham, Alistair & Penesis, Irene, 2021. "Seasonality of turbulence characteristics and wave-current interaction in two prospective tidal energy sites," Renewable Energy, Elsevier, vol. 178(C), pages 1322-1336.
    10. Martin-Short, R. & Hill, J. & Kramer, S.C. & Avdis, A. & Allison, P.A. & Piggott, M.D., 2015. "Tidal resource extraction in the Pentland Firth, UK: Potential impacts on flow regime and sediment transport in the Inner Sound of Stroma," Renewable Energy, Elsevier, vol. 76(C), pages 596-607.
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    1. Marsh, P. & Penesis, I. & Nader, J.R. & Cossu, R. & Auguste, C. & Osman, P. & Couzi, C., 2021. "Tidal current resource assessment and study of turbine extraction effects in Banks Strait, Australia," Renewable Energy, Elsevier, vol. 180(C), pages 1451-1464.

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