Undular tidal bore dynamics in the Daly Estuary, Northern Australia

Wolanski, E, Williams, D, Spagnol, S and Chanson, H (2004) Undular tidal bore dynamics in the Daly Estuary, Northern Australia. Estuarine Coastal And Shelf Science, 60 4: 629-636. doi:10.1016/j.ecss.2004.03.001

Author Wolanski, E
Williams, D
Spagnol, S
Chanson, H
Title Undular tidal bore dynamics in the Daly Estuary, Northern Australia
Journal name Estuarine Coastal And Shelf Science   Check publisher's open access policy
ISSN 0272-7714
Publication date 2004
Sub-type Article (original research)
DOI 10.1016/j.ecss.2004.03.001
Volume 60
Issue 4
Start page 629
End page 636
Total pages 8
Editor D. S. McLusky
E. Wolanski
S. D. Sulkin
Place of publication United Kingdom
Publisher Academic Press
Collection year 2004
Language eng
Subject C1
290802 Water and Sanitary Engineering
770502 Land and water management
Abstract Measurements in the macro-tidal Daly Estuary show that the presence of an undular tidal bore contributed negligibly to the dissipation of tidal energy. No recirculation bubble was observed between a trough and the following wave crest in the lee waves following the undular bore. This differs to stationary undular bores in laboratory experiments at larger Froude numbers where a recirculation bubble exists. Secondary motions and the turbulence generated by the undular bore had no measurable influence on the sediment transport. This situation contrasts with the intense sediment resuspension observed in breaking tidal bores. The tidally averaged sediment budget in the Daly Estuary was controlled by the asymmetry of tidal currents. The undular bore may widen the river by breaking along the banks that it undercuts, leading to bank slippage. A patch of river-wide macro-turbulence of 3-min duration occurred about 20 min after the passage of the bore during accelerating tidal currents. (C) 2004 Elsevier Ltd. All rights reserved.
Keyword Marine & Freshwater Biology
Tidal Bore
Recirculating Flow
Sediment Transport
Tide-velocity Asymmetry
River Estuary
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 05:00:18 EST