Mixing and Dispersion Role of Tidal Bores

Chanson, Hubert (2004). Mixing and Dispersion Role of Tidal Bores. In Michele Mossa, Youichi Yasuda and Hubert Chanson (Ed.), Fluvial, Environmental & Coastal Developments in Hydraulic Engineering (pp. 223-232) Leiden, The Netherlands: A. A. Balkema Publishers.

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Author Chanson, Hubert
Title of chapter Mixing and Dispersion Role of Tidal Bores
Title of book Fluvial, Environmental & Coastal Developments in Hydraulic Engineering
Place of Publication Leiden, The Netherlands
Publisher A. A. Balkema Publishers
Publication Year 2004
Sub-type Research book chapter (original research)
ISBN 041535899X
Editor Michele Mossa
Youichi Yasuda
Hubert Chanson
Start page 223
End page 232
Total pages 10
Total chapters 12
Collection year 2004
Language eng
Subjects 291205 Ocean Engineering
291100 Environmental Engineering
290802 Water and Sanitary Engineering
290800 Civil Engineering
291200 Maritime Engineering
770402 Land and water management
B1
Abstract/Summary When a river mouth has a flat converging shape and when the tidal range exceeds 6 to 9 m, the river may experience a tidal bore. A tidal bore is basically a positive surge propagating upstream as the tidal flow turns to rising. The occurrence of a bore has a significant impact on estuarine systems. Bed erosion and scour take place beneath the bore front while suspended matters may be carried upwards in the following wave motion. Analogies between hydraulic jumps and positive surges suggest that mixing coefficients are much greater than in estuary flows. Tidal bores impact also significantly on eco-systems. The existence of tidal bores relies upon a fragile hydrodynamic balance, which may be easily disturbed by changes in boundary conditions and freshwater inflows.
Keyword tidal bore
estuary
mixing
turbulence
field observations
Q-Index Code B1

 
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Created: Fri, 19 Aug 2005, 10:00:00 EST by Hubert Chanson on behalf of School of Engineering