SWASH MOTION DUE TO OBLIQUELY INCIDENT WAVES

Toshiyuki Asano

Abstract


A numerical model is developed to predict the flow characteristics in a swash zone for obliquely incident wave trains. The two-dimensional shallow water equations are de-coupled into independent equations each for on-off shore motion and for longshore motion. A front of swash wave train is treated as a moving boundary which makes the solution predictable for landward zone of the still water level. The results show non-vanishing longshore velocities and volume flux at the still water shoreline. These quantities are found to increase with the beach slope. The two-dimensional uprush and downrush motion near the front of swash waves shows skew figures, which may cause zig-zag longshore sediment transport inherent in swash zone.

Keywords


swash motion; oblique waves; incident waves

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