Morphodynamic evolution of a coastal lagoon entrance during swash overwash

Baldock, T. E., Weir, F. and Hughes, M. G. (2008) Morphodynamic evolution of a coastal lagoon entrance during swash overwash. Geomorphology, 95 3-4: 398-411. doi:10.1016/j.geomorph.2007.07.001


Author Baldock, T. E.
Weir, F.
Hughes, M. G.
Title Morphodynamic evolution of a coastal lagoon entrance during swash overwash
Journal name Geomorphology   Check publisher's open access policy
ISSN 0169-555X
Publication date 2008-03
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.geomorph.2007.07.001
Volume 95
Issue 3-4
Start page 398
End page 411
Total pages 13
Editor A. Platter
R. A. Marston
T. Oguchi
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Collection year 2009
Language eng
Subject 0905 Civil Engineering
960902 Coastal and Estuarine Land Management
CX
Abstract New field observations of beach berm growth resulting in the sub-aerial closure of an intermittently closed and open lake or lagoon are presented. These perched estuarine systems frequently exhibit ephemeral entrances that respond to process forcing almost instantaneously on a geomorphic timescale, with closure by a supra-tidal berm of depositional origin. The observations were made following a mechanical opening of the entrance and show very rapid vertical growth of an initially low beach berm as a result of swash overtopping and sediment overwash. Very little simultaneous seaward progradation was observed. Sediment overwash volumes were obtained from survey data over a period of 12 days either side of spring tide and the observations also provide an accurate measure of swash sediment transport at the berm crest. A process-based parametric model is developed through robust parameterisations of wave run-up, wave run-up distributions and sediment transport and is applied to predict the total overwash transport into and infilling the estuary entrance. The model is tested against the field data and compares well with the observations. While the field data are site-specific, the proposed modelling framework represents a first step in modelling the complex growth and recovery of natural beach berms in broad-scale morphodynamic models.
Keyword Beach berms
Sediment overwash
Intermittently closed estuaries
ICOLL
Beach morphology
Swash
Perched estuaries
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Civil Engineering Publications
 
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Created: Tue, 10 Mar 2009, 16:23:12 EST by Gail Smith on behalf of School of Civil Engineering