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Experimental study of bore run-up

Published online by Cambridge University Press:  26 April 2006

Harry H. Yeh ,
Abdulhamid Ghazali  and
Ingunn Marton
Harry H. Yeh
Affiliation:
Department of Civil Engineering, FX-10, University of Washington, Seattle, WA 98195, USA
Abdulhamid Ghazali
Affiliation:
Department of Civil Engineering, FX-10, University of Washington, Seattle, WA 98195, USA
Ingunn Marton
Affiliation:
Department of Civil Engineering, FX-10, University of Washington, Seattle, WA 98195, USA
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Abstract

Bore propagation near the shoreline, the transition from bore to wave run-up, and the ensuing run-up motion on a uniformly sloping beach are investigated experimentally. As a bore approaches the shoreline, the propagation speed first decelerates by compressing its wave form and then suddenly accelerates at the shoreline. Although this behaviour is qualitatively in agreement with the inviscid shallow-water wave prediction (often called the ‘bore collapse’ phenomenon), unlike the genuine bore-collapse phenomenon, the acceleration is caused by the ‘momentum exchange’ process, i.e. collision of the bore against the initially quiescent water along the shoreline. Owing to this momentum exchange, a single bore motion degenerates into two successive run-up water masses; one involves a turbulent run-up water motion followed by the original incident wave motion. The transition process from undular bore to wave run-up appears to be different from that of a fully developed bore. The bore front overturns directly onto the dry beach surface, and the run-up is characterized by a thin splashed-up flow layer.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 206 , September 1989 , pp. 563 - 578
Copyright
© 1989 Cambridge University Press

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