Turbulent advances of breaking bores: physical modelling in a large facility

Leng, Xinqian and Chanson, Hubert (2015). Turbulent advances of breaking bores: physical modelling in a large facility. In: Arthur Mynett, Proceedings of the 36th IAHR World Congress: Deltas of the Future and What Happens Upstream. 36th IAHR World Congress, The Hague, Netherlands, (4128-4139). 28 June-3 July 2015.

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Name Description MIMEType Size Downloads
Author Leng, Xinqian
Chanson, Hubert
Title of paper Turbulent advances of breaking bores: physical modelling in a large facility
Conference name 36th IAHR World Congress
Conference location The Hague, Netherlands
Conference dates 28 June-3 July 2015
Convener IAHR
Proceedings title Proceedings of the 36th IAHR World Congress: Deltas of the Future and What Happens Upstream
Place of Publication The Hague, Netherlands
Publisher IAHR
Publication Year 2015
Sub-type Fully published paper
Open Access Status Not Open Access
ISBN 9789082484601
Editor Arthur Mynett
Start page 4128
End page 4139
Total pages 12
Collection year 2016
Language eng
Abstract/Summary In an estuarine system, the flood tidal wave may become a tidal bore during the early flood tide in a narrow funnelled channel under large tidal ranges. Herein new experiments were conducted in a large flume to investigate breaking tidal bores and the bore roller propagation. The results demonstrated several key features of tidal bores propagating in rectangular channels. The propagation of the breaking bore roller was a highly turbulent process. The celerity of the roller toe fluctuated rapidly with both longitudinal and transverse distances. The instantaneous longitudinal free-surface profile of the roller showed significant temporal and spatial fluctuations. The free-surface fluctuations were maximum shortly after the toe passage. The unsteady velocity measurements indicated large and rapid fluctuations of all velocity components during the bore passage. The velocity fluctuations yielded very significant Reynolds stress amplitudes and fluctuations. Instantaneous stress magnitudes in excess of 90 Pa were observed in laboratory, having the potential to scour large non-cohesive materials.
Keyword Tidal bores
Breaking bores
Turbulence
Physical modelling
Reynolds stresses
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Civil Engineering Publications
Official 2016 Collection
 
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Created: Sat, 21 Nov 2015, 23:20:19 EST by Hubert Chanson on behalf of School of Civil Engineering