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Geomorphological modelling of entrance improvement options - Lake Illawarra

Authors:

Doug Treloar ,

David Taylor,

Garry Clarke

Abstract

The Delft3D Online Sediment modelling system has been used to investigate six preliminary designs for a northern entrance-training wall at Lake Illawarra on the NSW south coast. The designs were modelled under tidal conditions to investigate whether or not the ‘design’ entrance channels were self-scouring, and in a 100 Years Average Recurrence Interval (ARI) flood event to investigate the extent of any scour. The entrance to the lake has historically changed position due to the influence of tides, wave action, catchment runoff and longshore sediment transport, or been closed. This modelling study identified that some of these options did not provide a self-scouring channel under tidal flow, and others caused significant scour along the training walls during flood flows. Subsequently, two additional options were developed. They were designed to reduce the risk of entrance closure and to limit scour along the training walls during flood flows.
How to Cite: Treloar, D., Taylor, D. and Clarke, G., 2006. Geomorphological modelling of entrance improvement options - Lake Illawarra. Wetlands Australia, 21(2), pp.pp. 85–93. DOI: http://doi.org/10.31646/wa.263
Published on 28 Feb 2006.
Peer Reviewed

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