Author:
STOCKER J. R.,PEREGRINE D. H.
Abstract
By comparison with both experimental and numerical data, Dysthe's (1979) O(ε4)
modified nonlinear Schrödinger; equation has been shown to model the evolution
of a slowly varying wavetrain well (here ε is the wave steepness). In this work, we
extend the equation to include a prescribed, large-scale, O(ε2) surface current which
varies about a mean value. As an introduction, a heuristic derivation of the O(ε3)
current-modified equation, used by Bakhanov et al. (1996), is given, before a more
formal approach is used to derive the O(ε4) equation. Numerical solutions of the new
equations are compared in one horizontal dimension with those from a fully nonlinear
solver for velocity potential in the specific case of a sinusoidal surface current, such
as may be due to an underlying internal wave. The comparisons are encouraging,
especially for the O(ε4) equation.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
41 articles.
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