Harmonic generation past a submerged porous step

Reference:

Losada, I. J., Patterson, M. D. and Losada, M. A., 1997. Harmonic generation past a submerged porous step. Coastal Engineering, 31 (1-4), pp. 281-304.

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Official URL:

http://dx.doi.org/10.1016/S0378-3839(97)00011-2

Abstract

Experiments were conducted in a wave flume to study the differences between harmonic evolution of monochromatic waves as they propagate over a submerged impermeable or porous step under non-breaking conditions. Results are used as a preliminary analysis to establish some engineering design criteria on harmonic generation on submerged porous structures. The root-mean-squared wave height evolution is also studied and compared to linear models as a first approximation. It is shown that porous structure increases the effective relative depth and decreases the relative wave height, resulting in a lower Ursell number and a lower chance to generate harmonics. The effective water depth over a step as defined in the paper, provides information to evaluate the potential harmonic generation.

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