Breaking Waves and Turbulence
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.