Morphodynamic modelling of entrance breakout for a coastal lake

Wainwright, D. J., Kidd, L. J., Guard, P. A. and Baldock, T. E. (2011). Morphodynamic modelling of entrance breakout for a coastal lake. In: Coasts and Ports 2011, Perth, Australia, (84-89). 28-30 September 2011.

Author Wainwright, D. J.
Kidd, L. J.
Guard, P. A.
Baldock, T. E.
Title of paper Morphodynamic modelling of entrance breakout for a coastal lake
Conference name Coasts and Ports 2011
Conference location Perth, Australia
Conference dates 28-30 September 2011
Journal name 20th Australasian Coastal and Ocean Engineering Conference 2011 and the 13th Australasian Port and Harbour Conference 2011, COASTS and PORTS 2011
Place of Publication Barton, ACT, Australia
Publisher Engineers Australia
Publication Year 2011
Sub-type Fully published paper
ISBN 9781622764303
Start page 84
End page 89
Total pages 6
Language eng
Abstract/Summary Entrance breakout is an important process influencing sediment dynamics and hydrodynamic conditions in Intermittently Closed and Open Lake or Lagoons (ICOLLs). Breakout events may occur naturally in response to catchment rainfall or mechanically by excavation of a channel through the beach berm. In New South Wales, ICOLLs with untrained entrances are frequently opened in accordance with entrance opening strategies following increased lake water levels after rainfall. After an ocean entrance closes, coastal processes build the barrier, catchment runoff is trapped and water levels behind the barrier rise. This paper describes the development and validation of a coastal model at Lake Cathie to a measured breach event. The Lake Cathie / Lake Innes Estuary is located on the NSW east coast approximately 20 km south of Port Macquarie. Numerical modelling was adopted to investigate and assess existing environmental conditions and to provide further insight on the impacts of a variety of management strategies. A system based on a hydrodynamic model (TUFLOW – FV), spectral wave model (SWAN) and a sediment transport and morphology model (TUFLOW – MORPH) was used to simulate entrance breakout dynamics. This modelling system is presented. Using historical water level records, two entrance breakout events occurring in May 1996 and April 2002 were identified as suitable for validation purposes. Simulated and measured water levels were compared and excellent validation was achieved. The validation demonstrates the model is capable of reproducing measured behaviour and is suitable for testing the impact of various management options.
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Collection: School of Civil Engineering Publications
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Created: Tue, 18 Oct 2011, 21:12:35 EST by David Wainwright on behalf of School of Civil Engineering