Spectral analysis of irregular waves in wave–mud and wave–current–mud interactions

Farzin Samsami, Mohsen Soltanpour, Tomoya Shibayama

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The dissipation of irregular waves passing over muddy beds is investigated through two series of wave flume laboratory experiments with and without currents, where commercial kaolinite is used as the muddy sediment bed material. The changes in spectral characteristics of waves along the muddy bed and the effects of following and opposing currents are investigated. A numerical multi-layered model was also employed to simulate the attenuation of regular/irregular waves assuming viscoelastic rheological behavior for fluid mud, and the outputs were compared with the laboratory data. The first series of the experiments show that propagation of a wave spectrum over a short fluid mud section does not result in a shift in peak frequencies of wave spectra. The comparisons of spectral width parameters of various wave spectra also reveal that higher values of spectral peakedness parameters generally result in higher rates of wave energy dissipation. This can be related to the frequency dependency of wave energy dissipation on the mud layer. The results of the second series of experiments show higher dissipation rates in the opposing current and lower rates in the following current, which can be attributed to the changes in incident wave heights due to existence of currents. The study confirms that the dynamic pressure of wave propagation on the mud surface is the governing factor in regular/irregular wave–current–mud interaction and the current itself has little direct effect on the mud layer.

    Original languageEnglish
    Pages (from-to)1305-1320
    Number of pages16
    JournalOcean Dynamics
    Volume65
    Issue number9-10
    DOIs
    Publication statusPublished - 2015 Sep 26

    Fingerprint

    spectral analysis
    mud
    wave spectrum
    energy dissipation
    wave energy
    dissipation
    fluid
    wave height
    wave propagation
    kaolinite
    experiment
    sediment
    rate
    effect
    parameter

    Keywords

    • Irregular wave attenuation
    • Kaolinite
    • Wave flume experiments
    • Wave spectra
    • Wave–current–mud interaction

    ASJC Scopus subject areas

    • Oceanography

    Cite this

    Spectral analysis of irregular waves in wave–mud and wave–current–mud interactions. / Samsami, Farzin; Soltanpour, Mohsen; Shibayama, Tomoya.

    In: Ocean Dynamics, Vol. 65, No. 9-10, 26.09.2015, p. 1305-1320.

    Research output: Contribution to journalArticle

    Samsami, Farzin ; Soltanpour, Mohsen ; Shibayama, Tomoya. / Spectral analysis of irregular waves in wave–mud and wave–current–mud interactions. In: Ocean Dynamics. 2015 ; Vol. 65, No. 9-10. pp. 1305-1320.
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