Journal article

On Natural Modulational Bandwidth of Deep-Water Surface Waves

Alexander Babanin, Miguel Onorato, Luigi Cavaleri

Fluids | MDPI | Published : 2019

Abstract

We suggest that there exists a natural bandwidth of wave trains, including trains of wind-generated waves with a continuous spectrum, determined by their steepness. Based on laboratory experiments with monochromatic waves, we show that, if no side-band perturbations are imposed, the ratio between the wave steepness and bandwidth is restricted to certain limits. These limits are consistent with field observations of narrow-banded wind-wave spectra if a characteristic width of the spectral peak and average steepness are used. The role of the wind in such modulation is also discussed.

Grants

Awarded by ARC


Awarded by Progetto di Ricerca d'Ateneo - Italian Ministry of Education, University and Research (MIUR)


Awarded by "Departments of Excellence 2018-2022" Grant - Italian Ministry of Education, University and Research (MIUR)


Awarded by EU


Funding Acknowledgements

A.V.B. acknowledges ARC Discovery grant DP170101328. M. O. has been funded by Progetto di Ricerca d'Ateneo CSTO160004 and by the "Departments of Excellence 2018-2022" Grant awarded by the Italian Ministry of Education, University and Research (MIUR) (L. 232/2016). L.C. acknowledges the support of the EU contract 730030 H2020-EO-2016 CEASELESS.