Modulational instability in wind-forced waves
Atmospheric and Oceanic Physics
2015-06-23 v2 Fluid Dynamics
Abstract
We consider the wind-forced nonlinear Schroedinger (NLS) equation obtained in the potential flow framework when the Miles growth rate is of the order of the wave steepness. In this case, the form of the wind-forcing terms gives rise to the enhancement of the modulational instability and to a band of positive gain with infinite width. This regime is characterised by the fact that the ratio between wave momentum and norm is not a constant of motion, in contrast to what happens in the standard case where the Miles growth rate is of the order of the steepness squared.
Cite
@article{arxiv.1410.4070,
title = {Modulational instability in wind-forced waves},
author = {Maura Brunetti and Jérôme Kasparian},
journal= {arXiv preprint arXiv:1410.4070},
year = {2015}
}
Comments
5 pages, 2 figures, accepted for publication in Physics Letters A, few misprints corrected