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Long-time evolution of an unstable water-wave train

Published online by Cambridge University Press:  20 April 2006

Michael Stiassnie
Affiliation:
Department of Civil Engineering and Coastal & Marine Engineering Research Institute, Technion, I.I.T., Technion City, Haifa 32000, Israel
Uri I. Kroszynski
Affiliation:
Department of Civil Engineering and Coastal & Marine Engineering Research Institute, Technion, I.I.T., Technion City, Haifa 32000, Israel

Abstract

The long-time evolution of an unstable wave train, consisting of a carrier wave and two 'side-band’ components, is investigated analytically. Mathematical expressions, involving Jacobian elliptic functions, for the wave envelope characteristics are derived. The solution yields the dependence of the long-time evolution on the initial disturbance. Of special interest is the simple formula for the modulation-demodulation recurrence period. The latter is shown to yield results in good agreement with those obtained from numerical solutions of the nonlinear Schrödinger equation.

Type
Research Article
Copyright
© 1982 Cambridge University Press

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