Physical Modelling of the Flow Field in an Undular Tidal Bore

Chanson, Hubert (2005) Physical Modelling of the Flow Field in an Undular Tidal Bore. Journal of Hydraulic Research, 43 3: 234-244.

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Author Chanson, Hubert
Title Physical Modelling of the Flow Field in an Undular Tidal Bore
Journal name Journal of Hydraulic Research   Check publisher's open access policy
ISSN 0022-1686
Publication date 2005-07-01
Sub-type Article (original research)
Volume 43
Issue 3
Start page 234
End page 244
Total pages 11
Place of publication Madrid
Publisher Int Assn Hydraulic Research
Collection year 2005
Language eng
Subject 290802 Water and Sanitary Engineering
290800 Civil Engineering
770400 Coastal and Estuarine Environment
Abstract A tidal bore may form in a converging channel with a funnel shape when the tidal range exceeds 6-9 m. The advancing surge has a major impact on the estuarine ecosystem. Physical modelling of an undular bore has been conducted based upon a quasi-steady flow analogy. The experimental data highlight rapid flow redistributions between successive wave troughs and crests as well as large bottom shear stress variations. The results suggest a sediment transport process combining scour beneath wave troughs associated with upward matter dispersion between a trough and the following wave crest. The process is repeated at each trough and significant sediment transport takes place with deposition in upstream intertidal zones. The conceptual model is supported by field observations showing murky waters after the bore passage and long-lasting chaotic waves.
Keyword tidal bore
undular bore
undular jump
boundary shear stress
sediment process
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Created: Wed, 03 Aug 2005, 10:00:00 EST by Hubert Chanson on behalf of School of Engineering