Undular tidal bores: Effect of channel constriction and bridge piers

Chanson, Hubert (2011) Undular tidal bores: Effect of channel constriction and bridge piers. Environmental Fluid Mechanics, 11 4: 385-404. doi:10.1007/s10652-010-9189-5

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Author Chanson, Hubert
Title Undular tidal bores: Effect of channel constriction and bridge piers
Journal name Environmental Fluid Mechanics   Check publisher's open access policy
ISSN 1567-7419
Publication date 2011
Sub-type Article (original research)
DOI 10.1007/s10652-010-9189-5
Open Access Status File (Author Post-print)
Volume 11
Issue 4
Start page 385
End page 404
Total pages 20
Place of publication Netherlands
Publisher Springer Netherlands
Collection year 2012
Language eng
Abstract A tidal bore may occur in a macro-tidal estuary when the tidal range exceeds 4.5-6 m and the estuary bathymetry amplifies the tidal wave. Its upstream propagation induces a strong mixing of the estuarine waters. The propagation of undular tidal bores was investigated herein to study the effect of bridge piers on the bore propagation and characteristics. Both the tidal bore profile and the turbulence generated by the bore were recorded. The free-surface undulation profiles exhibited a quasi-periodic shape, and the potential energy of the undulations represented up to 30% of the potential energy of the tidal bore. The presence of the channel constriction had a major impact on the free-surface properties. The undular tidal bore lost nearly one third of its potential energy per surface area as it propagated through the channel constriction. The detailed instantaneous velocity measurements showed a marked effect of the tidal bore passage suggesting the upstream advection of energetic events and vorticity "clouds" behind the bore front in both channel configurations: prismatic and with constriction. The turbulence patches were linked to some secondary motions and the proposed mechanisms were consistent with some field observations in the Daly River tidal bore. The findings emphasise the strong mixing induced by the tidal bore processes, and the impact of bridge structures on the phenomenon. © 2010 Springer Science+Business Media B.V.
Keyword Bridge piers
Channel constriction
Experimental measurements
Free-surface undulations
Macro-turbulence
Turbulent events
Undular tidal bores
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes The full bibliographic details are: CHANSON, H. (2011). "Undular Tidal Bores: Effect of Channel Constriction and Bridge Piers." Environmental Fluid Mechanics, Vol. 11, No. 4, pp. 385-404 & 4 videos (DOI: 10.1007/s10652-010-9189-5) (ISSN 1567-7419 [Print] 1573-1510 [Online]). The Electronic Supplementary Material includes 4 video movies (Quciktime format).

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2012 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 4 times in Scopus Article | Citations
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Created: Sun, 10 Jul 2011, 17:57:36 EST by Hubert Chanson on behalf of School of Civil Engineering