Simultaneous Image Measurement of Sprays and Air Bubbles Formed during Wind Wave Breaking Event

  • OTSUKA Junichi
    Civil Engineering Research Institute for Cold Region
  • WATANABE Yasunori
    Hokkaido University, School of Engineering, Environmental Hydraulics Laboratory
  • TASHIRO Koki
    Hokkaido University, School of Engineering, Environmental Hydraulics Laboratory
  • OHYAMA Takahiro
    Hokkaido University, School of Engineering, Environmental Hydraulics Laboratory
  • SARUWATARI Ayumi
    Hokkaido University, School of Engineering, Environmental Hydraulics Laboratory
  • YAMADA Tomohito
    Hokkaido University, School of Engineering, Environmental Hydraulics Laboratory

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Other Title
  • 風波砕波下の飛沫と気泡の同時画像計測
  • フウハサイハ カ ノ ヒマツ ト キホウ ノ ドウジ ガゾウ ケイソク

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Abstract

Sprays and air bubbles formed during wind wave breaking events under various wind conditions were simultaneously visualized using two high-speed video cameras and a back-light imaging technique. The shapes of the sprays and entrained bubbles were quantitatively measured on the basis of novel level-set image detecting algorithm. Spectrum slope of spray and bubble size were found to decrease from approximately 2.2 mm and 1.5 mm respectively. It was also found that the volume rate and wind-wave Reynolds number (RB), the number density and RB are both related to positive correlation.

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