Coherent eddies induced by breakers on a sloping bed

Nobuhiro Matsunaga, Kosei Takehara, Yoichi Awaya

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    6 Citations (Scopus)

    Abstract

    The separation of boundary layer occurs periodically near a breaking point when incident waves climbing up a sloping bed are about to break. Not the breaker but the separation forms an unsteady coherent eddy, which suspends a large amount of bed material. A row of steady vortices has been found along the water surface of an offshore zone. Its formation is due to the shear instability between shoreward steady flow induced near the bed and offshore steady flow near the water surface. Moving in the offshore direction, the steady vortices repeat amalgamation each other and increase their intervals at the order of mean water depth. They decay after reaching to the region where the shear rate is not enough between the two steady flows. This shear instability may be excited by the periodic separation of boundary layer.

    Original languageEnglish
    Title of host publicationTwenty First Coastal Eng Conf
    PublisherPubl by ASCE
    Pages234-245
    Number of pages12
    ISBN (Print)0872626873
    Publication statusPublished - Dec 1 1988
    EventTwenty-First Coastal Engineering Conference - Costa del Sol, Malaga, Spain
    Duration: Jun 20 1988Jun 25 1988

    Publication series

    NameTwenty First Coastal Eng Conf

    Other

    OtherTwenty-First Coastal Engineering Conference
    CityCosta del Sol, Malaga, Spain
    Period6/20/886/25/88

    Fingerprint

    Steady flow
    Boundary layers
    Vortex flow
    Water
    Shear deformation

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

    Cite this

    Matsunaga, N., Takehara, K., & Awaya, Y. (1988). Coherent eddies induced by breakers on a sloping bed. In Twenty First Coastal Eng Conf (pp. 234-245). (Twenty First Coastal Eng Conf). Publ by ASCE.

    Coherent eddies induced by breakers on a sloping bed. / Matsunaga, Nobuhiro; Takehara, Kosei; Awaya, Yoichi.

    Twenty First Coastal Eng Conf. Publ by ASCE, 1988. p. 234-245 (Twenty First Coastal Eng Conf).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Matsunaga, N, Takehara, K & Awaya, Y 1988, Coherent eddies induced by breakers on a sloping bed. in Twenty First Coastal Eng Conf. Twenty First Coastal Eng Conf, Publ by ASCE, pp. 234-245, Twenty-First Coastal Engineering Conference, Costa del Sol, Malaga, Spain, 6/20/88.
    Matsunaga N, Takehara K, Awaya Y. Coherent eddies induced by breakers on a sloping bed. In Twenty First Coastal Eng Conf. Publ by ASCE. 1988. p. 234-245. (Twenty First Coastal Eng Conf).
    Matsunaga, Nobuhiro ; Takehara, Kosei ; Awaya, Yoichi. / Coherent eddies induced by breakers on a sloping bed. Twenty First Coastal Eng Conf. Publ by ASCE, 1988. pp. 234-245 (Twenty First Coastal Eng Conf).
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    AB - The separation of boundary layer occurs periodically near a breaking point when incident waves climbing up a sloping bed are about to break. Not the breaker but the separation forms an unsteady coherent eddy, which suspends a large amount of bed material. A row of steady vortices has been found along the water surface of an offshore zone. Its formation is due to the shear instability between shoreward steady flow induced near the bed and offshore steady flow near the water surface. Moving in the offshore direction, the steady vortices repeat amalgamation each other and increase their intervals at the order of mean water depth. They decay after reaching to the region where the shear rate is not enough between the two steady flows. This shear instability may be excited by the periodic separation of boundary layer.

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