Turbulent mixing beneath an undular bore front

Koch, Christian and Chanson, Hubert (2008) Turbulent mixing beneath an undular bore front. Journal of Coastal Research, 24 4: 999-1007. doi:10.2112/06-0688.1

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Author Koch, Christian
Chanson, Hubert
Title Turbulent mixing beneath an undular bore front
Journal name Journal of Coastal Research   Check publisher's open access policy
ISSN 0749-0208
Publication date 2008
Year available 2008
Sub-type Article (original research)
DOI 10.2112/06-0688.1
Volume 24
Issue 4
Start page 999
End page 1007
Total pages 9
Place of publication United States
Publisher Coastal Education & Research Foundation, Inc.
Collection year 2009
Language eng
Subject 290000 Engineering and Technology
290800 Civil Engineering
290802 Water and Sanitary Engineering
291800 Interdisciplinary Engineering
291803 Turbulent Flows
Abstract In macro-tidal estuaries, a tidal bore may form during spring tide conditions when the flood tide is confined to a narrow channel. Most field occurrences showed well-defined undulations behind the leading wave, that is an undular bore process. Herein detailed free-surface and turbulence measurements were performed beneath undular bore fronts using side-looking acoustic Doppler velocimetry and non-intrusive free-surface measurement devices in a laboratory channel. Undular bores were observed for Froude numbers less than 1.7 which compared favourably with past studies. Velocity measurements with a temporal resolution of 50 Hz showed a marked effect of the bore passage. Longitudinal velocities were characterised by rapid flow deceleration at all vertical elevations, while large fluctuations of transverse velocities were recorded beneath the front. Turbulent Reynolds stress data highlighted high levels in the lower flow region including next to the bed. Maximum normal and tangential turbulent stresses were observed immediately upstream of and at wave crests.
Keyword Tidal bores
Undular surges
Turbulence
Turbulent shear flow
Bore front propagation
Instantaneous velocity field
Unsteady turbulence
Turbulent Reynolds stresses
Physical modelling
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Le Mascaret de la Seine {http://www.uq.edu.au/~e2hchans/mascaret.html} Free-Surface Undulations in Open Channel Flows: Undular Jumps, Undular Surges, Standing Waves {http://www.uq.edu.au/~e2hchans/undular.html} Audiovisual references LESPINASSE, P. (2005). "Sons of the Moon" Grand Angle production, France, 50 min.. NHK Japan Broadcasting Corp (1989). "Pororoca : the Backward Flow of the Amazon." Videocassette VHS colour, NHK, Japan, 29 minutes. (English version: Films for the Humanities, Princeton NJ, USA, 1989.)
Q-Index Code C1
Q-Index Status Provisional Code
Additional Notes The full bibliographic details are : KOCH, C., and CHANSON, H. (2008). "Turbulent Mixing beneath an Undular Bore Front." Journal of Coastal Research, Vol. 24, No. 4, pp. 999-1007 (DOI: 10.2112/06-0688.1) (ISSN 0749-0208).

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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