Ocean driven flooding of a coastal lake

Callaghan, David P., Vu, Thuy T. T., Hanslow, David, J., Nielsen, Peter, You, Zai-Jin and Teakle, Ian (2014). Ocean driven flooding of a coastal lake. In: Patrick Lynett, Proceedings of the 34th International Conference: Coastal Engineering 2014. International Conference on Coastal Engineering, Seoul, Korea, (1-9). 15-20 June 2014. doi:10.9753/icce.v34.currents.47

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Author Callaghan, David P.
Vu, Thuy T. T.
Hanslow, David, J.
Nielsen, Peter
You, Zai-Jin
Teakle, Ian
Title of paper Ocean driven flooding of a coastal lake
Conference name International Conference on Coastal Engineering
Conference location Seoul, Korea
Conference dates 15-20 June 2014
Proceedings title Proceedings of the 34th International Conference: Coastal Engineering 2014   Check publisher's open access policy
Place of Publication San Francisco, CA, United States
Publisher Coastal Engineering Research Council
Publication Year 2014
Sub-type Fully published paper
DOI 10.9753/icce.v34.currents.47
Open Access Status DOI
ISBN 9780989661126
ISSN 2156-1028
Editor Patrick Lynett
Start page 1
End page 9
Total pages 9
Collection year 2015
Language eng
Abstract/Summary Analysis of Lake Conjola flooding in April 2006, provided in this paper, attributes it to waves pumping water over a 300 m long beach berm and into Lake Conjola. This overwash, generated by the medium wave height swell occurring during this flooding, was able to lift the lake levels near the entrance, persistently over several tidal cycles, to well above the ocean water levels . The wave pump model was used to model this flooding. Lake Conjola water storage and dynamics were modelled by using a two-node continuity based model that a change in storage in time is driven by the net inflow to a node and these nodes and the ocean are linked by log-law. The extents of these two nodes were established from previous water surface measurements. While the qualitative flood behavior was reproduced by this remarkably simple model, the peak flood level was not satisfactorily predicted when using literature values for model turning parameters. One reason for this mismatch was that the waves pumped against a head including critical flow on the beach berm. Based on recent images of Lake Conjola wave overwash events, it may be concluded that pumping against critical flow is too harsh. Removing this from the model has halved the gap between the measurements and predictions. However, more research is definitely required to establish what components should be included in the hydraulic head pumped against.
Keyword Coastal flooding
Wave pumping
Overwash
Continuity modelling
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Civil Engineering Publications
Official 2015 Collection
 
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Created: Mon, 23 Feb 2015, 21:08:26 EST by Jeannette Watson on behalf of School of Civil Engineering