Wave breaking in undular bores generated by a moving weir

If a weir is dragged through a wave flume, the upstream flow takes the form of an undular bore propagating ahead of the weir. It was found previously in the work of Wilkinson and Banner (“Undular bores,” in 6th Australian Hydraulics and Fluid Mechanics Conference, Adelaide, Australia, 1977) that the...

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Bibliographic Details
Published in:Physics of fluids (1994) 2019-03, Vol.31 (3)
Main Authors: Hatland, Sondre Dahle, Kalisch, Henrik
Format: Article
Language:English
Subjects:
Boussinesq equations
Cavities
Computational fluid dynamics
Fluid dynamics
Fluid flow
Fluid mechanics
Hydraulics
Mathematical models
Physics
Temperature
Upstream
Wave breaking
Wave tanks
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Summary:If a weir is dragged through a wave flume, the upstream flow takes the form of an undular bore propagating ahead of the weir. It was found previously in the work of Wilkinson and Banner (“Undular bores,” in 6th Australian Hydraulics and Fluid Mechanics Conference, Adelaide, Australia, 1977) that the leading wave of the undular bore will break if the bore strength given by the ratio of downstream to upstream flow depth exceeds a certain value. In the present work, a Boussinesq system is used to study the situation in a numerical wave tank. It is found that if a convective breaking criterion is used to indicate wave breaking, then the critical bore strength of the numerical model agrees with the experimental value of Wilkinson and Banner up to an error of less than 2%.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.5085861