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Breaking Waves and Turbulence
Oral
Junichi Otsuka, PhD
chief scientist
Civil Engineering Research Institute for Cold Region
Yasunori Watanabe, PhD
Associate Professor
Hokkaido University
The transport process of dissolved carbon dioxide (DCO2) under air-water turbulent flows in a surf zone was experimentally observed using PIV, LIF, and LED backlight systems. DCO2 concentration in the fully saturated turbulence region (bore region) increased with time and reached a high level earlier than the unsaturated turbulence region (transition region). The undertow transported the concentrated DCO2 in the bore region toward the wave breaking point. In a surf zone, entrained air bubbles and strong turbulence locally enhance the gas dissolution into water, and the undertow contributes to transportation of the dissolved gas in the whole surf zone.