The offshore vortex train

N. Matsunaga, K. Takehara, Y. Awaya

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)


    A row of two-dimensional vortices forms in an offshore zone when regular surface waves run up a sloping flat bed. This vortex row is called the offshore vortex train. The vortices begin to appear near the breaking point. Moving in the offshore direction, they develop and increase their horizontal lengthscale through vortex merging. After reaching a particular offshore location, however, they decay rapidly. The formation region of the vortex train has been investigated on the basis of visual experiments for three bed slopes. Its formation does not depend on the type of wave breaking but is observed when the steepness of deep-water waves is smaller than 4.2 × 10−2. The horizontal lengthscale of the vortices and the velocities of the vortex movement have also been evaluated empirically.

    Original languageEnglish
    Pages (from-to)113-124
    Number of pages12
    JournalJournal of Fluid Mechanics
    Issue number5
    Publication statusPublished - Oct 10 1994

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering


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