Journal article

An experimental comparison of velocities underneath focussed breaking waves

Alberto Alberello, Amin Chabchoub, Jason P Monty, Filippo Nelli, Jung Hoon Lee, John Elsnab, Alessandro Toffoli

OCEAN ENGINEERING | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2018

Abstract

Nonlinear wave interactions affect the evolution of steep wave groups, their breaking and the associated kinematic field. Laboratory experiments are performed to investigate the effect of the underlying focussing mechanism on the shape of the breaking wave and its velocity field. In this regard, it is found that the shape of the wave spectrum plays a substantial role. Broader underlying wave spectra leads to energetic plungers at a relatively low amplitude. For narrower spectra waves break at higher amplitudes but with a less energetic spiller. Comparison with standard engineering methods commonly used to predict the velocity underneath extreme waves shows that, under certain conditions, the..

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