Qualitative comparisons of experimental results on deterministic freak wave generation based on modulational instabilty

N. Karjanto, Embrecht W.C. van Groesen

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    A number of qualitative comparisons of experimental results on unidirectional freak wave generation in a hydrodynamic laboratory are presented in this paper. A nonlinear dispersive type of wave equation, the nonlinear Schrödinger equation, is chosen as the theoretical model. A family of exact solutions of this equation the so-called Soliton on Finite Background describing modulational instability phenomenon is implemented in the experiments. It is observed that all experimental results show an amplitude increase according to the phenomenon. Both the carrier wave frequency and the modulation period are preserved during the wave propagation. As predicted by the theoretical model, a phase singularity is also observed in the experiments. Due to frequency downshift phenomenon, the experimental signal and spectrum lose their symmetric property. Another qualitative comparison indicates that the Wessel curves for the experimental results are the perturbed version of the theoretical ones.
    Original languageUndefined
    Article number10.1016/j.jher.2009.10.008
    Pages (from-to)186-192
    Number of pages7
    JournalJournal of hydro-environment research
    Issue number4
    Publication statusPublished - 2010


    • Nonlinear Schrödinger equation
    • Phase singularity
    • Soliton on Finite Background
    • EWI-17841
    • Wessel curve
    • IR-71241
    • Modulational instability
    • Freak wave generation
    • Frequency downshift
    • METIS-277404

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