145323-Modelling morphological changes and migration of large sand waves in a very energetic tidal.pdf (3.41 MB)
Modelling morphological changes and migration of large sand waves in a very energetic tidal environment: Banks Strait, Australia
journal contribution
posted on 2023-05-21, 00:46 authored by Auguste, C, Philip MarshPhilip Marsh, Jean-Roch NaderJean-Roch Nader, Irene PenesisIrene Penesis, Cossu, RBanks 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.
Funding
Australian Renewable Energy Agency
MAKO Tidal Turbines Pty Ltd
OpenHydro Group Ltd
Sabella SA
Spiral Energy Corporation Pty Ltd
University of Queensland
History
Publication title
EnergiesVolume
14Issue
13Article number
3943Number
3943Pagination
1-30ISSN
1996-1073Department/School
Australian Maritime CollegePublisher
MDPI AGPlace of publication
SwitzerlandRights statement
Copyright 2021 by the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/Repository Status
- Open