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Integral flow properties of the swash zone and averaging. Part 2. Shoreline boundary conditions for wave-averaged models

Published online by Cambridge University Press:  23 May 2002

M. BROCCHINI  and
G. BELLOTTI
M. BROCCHINI
Affiliation:
DIAm, Università di Genova, 16145 Genova, Italy
G. BELLOTTI
Affiliation:
DSIC, Università degli Studi Roma Tre, 00146 Roma, Italy
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Abstract

Shoreline boundary conditions for nearshore hydrodynamic models are discussed on the basis of the swash zone equations of Brocchini & Peregrine (1996). Swash zone flows are investigated further using the shallow water equations. Results from numerical computations are used to guide approximation to provide more practical boundary conditions for wave-averaged flows. Approximate boundary conditions, valid for small values of the rate of change of the mean water volume in the swash zone, are found which allow explicit computation of a non-zero mean water depth at the mean shoreline. This is computed in terms of the local height of the short waves. Implementation issues are also discussed.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 458 , 10 May 2002 , pp. 269 - 281
Copyright
© 2002 Cambridge University Press

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