PIV measurements of velocities and accelerations under breaking waves on a slope

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    Abstract

    Understanding the physics of breaking waves is an ongoing research topic, not only due to human curiosity, but also due to the influence breaking waves have on offshore structures. In recent years, the development in experimental methods has facilitated a new insight into the physics of breaking waves. In this study, we have investigated the wave kinematics under steep and breaking waves on a laboratory beach with a slope of 1/25. The velocity field was measured by use of Particle Image Velocimetry (PIV) at a sample rate of 96Hz. The high sample rate allowed for the accelerations to be determined directly from the sampled velocities. It was found that both velocities and accelerations differ from the ones predicted from common wave theories such as streamfunction theory. This was especially evident at the top part of the wave close to the surface. This was not surprising, since the breaking event is a highly non-linear process. The results presented here may facilitate computations of the impact force on offshore structures and furthermore be used for validation of CFD models while altogether shedding light on the mechanisms behind breaking waves.
    Original languageEnglish
    Article number7837
    JournalGeophysical Research Abstracts
    Volume19
    Number of pages1
    ISSN1607-7962
    Publication statusPublished - 2017
    EventEGU General Assembly 2017: European GEosciences Union 2017 - Vienna, Austria
    Duration: 23 Apr 201728 Apr 2017
    http://www.egu2017.eu

    Conference

    ConferenceEGU General Assembly 2017
    Country/TerritoryAustria
    CityVienna
    Period23/04/201728/04/2017
    Internet address

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    • Oral presentation

      Malene Hovgaard Vested (Guest lecturer)

      24 Apr 201728 Apr 2017

      Activity: Talks and presentationsConference presentations

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