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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.
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jcr08_4.pdf
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jcr08_4.pdf
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application/pdf
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1.08MB
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532
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| Author
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Koch, Christian
Chanson, Hubert
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| Title
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Turbulent mixing beneath an undular bore front
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| Journal name
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Journal of Coastal Research (ERA 2012 Listed) (ERA 2010 Rank C) Check publisher's open access policy
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| Publication date
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2008
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| Sub-type
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Article
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| Year available
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2008
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| DOI
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10.2112/06-0688.1
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| Volume number
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24
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| Issue number
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4
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| ISSN
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0749-0208
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| Start page
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999
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| End page
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1007
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| Total pages
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9
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| Place of publication
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United States
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| Publisher
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Coastal Education & Research Foundation, Inc.
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| Collection year
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2009
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| Language
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eng
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| Subject
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290000 Engineering and Technology
290800 Civil Engineering
290802 Water and Sanitary Engineering
291800 Interdisciplinary Engineering
291803 Turbulent Flows
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| Abstract
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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.
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| Keyword
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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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| References
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M.Sc. thesis, Marine Science Laboratories, University College of North Wales, Bangor, UK. LOCKE, A., HANSON, J.M., KLASSEN, G.J., RICHARDSON, S.M., and AUBE, C.I. (2003). "The Damming of the Petiticodiac River: Species, Populations, and Habitats Lost." Northeastern Naturalist, Vol. 10, No. 1, pp. 39-54. MALANDAIN, J.J. (1988). "La Seine au Temps du Mascaret." ('The Seine River at the Time of the Mascaret.') Le Chasse-Marée, No. 34, pp. 30-45 (in French). MOORE, R.N. (1888). "Report on the Bore of the Tsien-Tang Kiang." Hydrographic Office, London. PIQUET, J. (1999). "Turbulent Flows. Models and Physics." Springer, Berlin, Germany, 761 pages. QUINTUS CURCIUS (1984). "The History of Alexander." Penguin, New York, USA, translated by J. YARDLEY, 332 pages. ROUSE, H. (1938). "Fluid Mechanics for Hydraulic Engineers." McGraw-Hill Publ., New York, USA (also Dover Publ., New York, USA, 1961, 422 pages) ROUSE, H. (1959). "Advanced Mechanics of Fluids." John Wiley, New York, USA, 444 pages. SIMPSON, J.H., FISHER, N.R., and WILES, P. (2004). "Reynolds Stress and TKE Production in an Estuary with a Tidal Bore." Estuarine, Coastal and Shelf Science, Vol. 60, No. 4, pp. 619-627. TRESKE, A. (1994). "Undular Bores (Favre-Waves) in Open Channels - Experimental Studies." Jl of Hyd. Res., IAHR, Vol. 32, No. 3, pp. 355-370. Discussion : Vol. 33, No. 3, pp. 274-278. WOLANSKI, E., WILLIAMS, D., SPAGNOL, S., and CHANSON, H. (2004). "Undular Tidal Bore Dynamics in the Daly Estuary, Northern Australia." Estuarine, Coastal and Shelf Science, Vol. 60, No. 4, pp. 629-636 Additional bibliography Internet references Tidal bores, Mascaret, Pororoca. Myths, Fables and Reality !!! {http://www.uq.edu.au/~e2hchans/tid_bore.html} The tidal bore of the Seine river, France. 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.)
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| Q-Index Code
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C1
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| Additional Notes
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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).
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