Unsteady turbulence, dynamic similarity and scale effects in bores and positive surges

Leng, Xinqian and Chanson, Hubert (2017) Unsteady turbulence, dynamic similarity and scale effects in bores and positive surges. European Journal of Mechanics B/Fluids, 61 Part 1: 125-135. doi:10.1016/j.euromechflu.2016.09.017

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Author Leng, Xinqian
Chanson, Hubert
Title Unsteady turbulence, dynamic similarity and scale effects in bores and positive surges
Journal name European Journal of Mechanics B/Fluids   Check publisher's open access policy
ISSN 0997-7546
Publication date 2017-01-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.euromechflu.2016.09.017
Open Access Status Other
Volume 61
Issue Part 1
Start page 125
End page 135
Total pages 11
Place of publication Issy les Moulineaux, Cedex, France
Publisher Elsevier Masson
Language eng
Subject 2610 Mathematical Physics
3100 Physics and Astronomy
Abstract A tidal bore is a positive surge or compression wave formed in an estuarine system during the early flood tide under macro-tidal conditions. A series of physical experiments were conducted in a large facility to investigate the unsteady free-surface properties, velocity characteristics and Reynolds shear stresses. Both instantaneous and ensemble-averaged measurements were performed. The results demonstrated the intense turbulence and turbulent mixing under breaking and undular tidal bores. A range of dimensionless unsteady turbulent properties were carefully compared based upon both Froude and Morton similitudes with two different Reynolds number ranges. The data showed that several parameters were affected by scale effects, including velocity and Reynolds stress fluctuations during the bore propagation. The finding implies that laboratory study data might not be up-scaled to prototype conditions without some form of scale effects.
Keyword Tidal bores
Compression waves
Positive surges
Physical modelling
Scale effects
Unsteady turbulence
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DP120100481
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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Created: Wed, 07 Dec 2016, 18:40:05 EST by Hubert Chanson on behalf of School of Civil Engineering