Breaking bore: physical observations of roller characteristics

Leng, Xinqian and Chanson, Hubert (2015) Breaking bore: physical observations of roller characteristics. Mechanics Research Communications, 65 24-29. doi:10.1016/j.mechrescom.2015.02.008

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Author Leng, Xinqian
Chanson, Hubert
Title Breaking bore: physical observations of roller characteristics
Journal name Mechanics Research Communications   Check publisher's open access policy
ISSN 0093-6413
1873-3972
Publication date 2015-04-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.mechrescom.2015.02.008
Open Access Status File (Author Post-print)
Volume 65
Start page 24
End page 29
Total pages 6
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press
Language eng
Abstract In an estuary, a tidal bore is a hydraulic jump in translation generated at the leading edge of the flood tide during the early flood tide under spring macrotidal conditions in a narrow funnelled channel. After formation, the bore is traditionally analysed as a hydraulic jump in translation and its leading edge is characterised by a breaking roller for Fr-1 > 1.3-1.5. Herein new unsteady experiments were conducted to investigate in details the upstream propagation of breaking bore roller. The toe perimeter shape fluctuated rapidly with transverse distance and time. A characteristic transverse wave length of the toe perimeter was observed. Both the standard deviation of toe perimeter location and characteristic transverse wave length were comparable to field observations. The celerity of the roller toe fluctuated rapidly with time and space. The instantaneous longitudinal profile of the roller free-surface showed significant temporal and spatial fluctuations. Although the bore propagation may be analysed in an integral form in first approximation, the rapid fluctuations in roller toe perimeter and free-surface profiles indicated a strongly three-dimensional turbulent flow motion. (C) 2015 Elsevier Ltd. All rights reserved.
Formatted abstract
In an estuary, a tidal bore is a hydraulic jump in translation generated at the leading edge of the flood tide during the early flood tide under spring macrotidal conditions in a narrow funnelled channel. After formation, the bore is traditionally analysed as a hydraulic jump in translation and its leading edge is characterised by a breaking roller for Fr1 > 1.3–1.5. Herein new unsteady experiments were conducted to investigate in details the upstream propagation of breaking bore roller. The toe perimeter shape fluctuated rapidly with transverse distance and time. A characteristic transverse wave length of the toe perimeter was observed. Both the standard deviation of toe perimeter location and characteristic transverse wave length were comparable to field observations. The celerity of the roller toe fluctuated rapidly with time and space. The instantaneous longitudinal profile of the roller free-surface showed significant temporal and spatial fluctuations. Although the bore propagation may be analysed in an integral form in first approximation, the rapid fluctuations in roller toe perimeter and free-surface profiles indicated a strongly three-dimensional turbulent flow motion.
Keyword Bore roller
Compression waves
Open channels
Free-surface profile
Roller shape
Roller toe perimeter
Bore celerity
Hydraulic jumps
Breaking bores
Roller
Momentum principle
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP120100481
MASCARET 10-BLAN-0911-01
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2016 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 23 Mar 2015, 21:27:06 EST by Hubert Chanson on behalf of School of Civil Engineering