Measurement and modelling of an artificial coastal lagoon breach

Wainwright, D. J. and Baldock, T. E. (2015) Measurement and modelling of an artificial coastal lagoon breach. Coastal Engineering, 101 1-16. doi:10.1016/j.coastaleng.2015.04.002


 
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Author Wainwright, D. J.
Baldock, T. E.
Title Measurement and modelling of an artificial coastal lagoon breach
Journal name Coastal Engineering   Check publisher's open access policy
ISSN 0378-3839
1872-7379
Publication date 2015-07-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.coastaleng.2015.04.002
Volume 101
Start page 1
End page 16
Total pages 16
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Abstract A field data set of the artificial breaching of a coastal lagoon berm is presented, and includes a detailed analysis of the breach evolution in plan and elevation, together with water levels and flow velocities. A semi-coupled two-dimensional (depth averaged) numerical model describing both the shallow water hydrodynamics and morphodynamics is developed and tested against the field data. Key hydrodynamic and morphodynamic processes are discussed, and strategies to model these processes are presented and evaluated, such as accounting for modified roughness under transcritical flows and testing an improved algorithm for widening of the breach channel through side wall erosion. While further research is warranted, the processes relating to the erosion of the breach side walls and sediment transport under transcritical flow regimes were found to be essential to developing a realistic model of the overall breach process. A new channel bank erosion model is developed and implemented, which shows improved performance.
Keyword Coastal lagoon
Breaching
Morphological modelling
Sandy beach berm
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2016 Collection
 
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