Encyclopedia of Natural Hazards

2013 Edition
| Editors: Peter T. Bobrowsky

Tidal Bores

Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-4399-4_50

Synonyms

Benak (Malaysia); Bono (Indonesia); Burro (Mexico); Mascaret (France); Pororoca (Brazil)

Definition

A tidal bore is a positive surge of tidal origin that may occur in an estuary when the tidal flow turns to rising; the existence of a tidal bore is linked with a large tidal range, an estuarine bathymetry that amplifies the tidal wave and a low freshwater level.

Discussion

A tidal bore is an unsteady flow motion generated by the rapid water level rise at a river mouth during the early flood tide when the flood tide waters rush into a funnel-shaped river mouth that amplifies the tidal range. A bore is a sudden increase of the water depth as illustrated in Figures  1 and 2. Figure  1 shows a tidal bore in the Bay of Mont Saint Michel (France). The tidal bore advances in the river channel and on the surrounding sand flats. Figure  2presents the tidal bore of the Dordogne River (France). The surfers give the scale of the bore front. Worldwide, it is estimated that over 400 estuaries...
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Bibliography

  1. Chanson, H., 2004. Environmental Hydraulics of Open Channel Flows. Oxford: Elsevier Butterworth-Heinemann, p. 483.Google Scholar
  2. Chanson, H., 2009. The rumble sound generated by a tidal bore event in the Baie du Mont Saint Michel. Journal of Acoustical Society of America, 125(6), 3561–3568, doi:10.1121/1.3124781.CrossRefGoogle Scholar
  3. Koch, C., and Chanson, H., 2009. Turbulence measurements in positive surges and bores. Journal of Hydraulic Research, 47(1), 29–40. doi:10.3826/jhr.2009.2954.CrossRefGoogle Scholar
  4. 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).Google Scholar
  5. Peregrine, D. H., 1966. Calculations of the development of an Undular Bore. Journal of Fluid Mechanics, 25, 321–330.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.School of Civil EngineeringThe University of QueenslandBrisbaneAustralia