High-velocity free-surface flows may be characterised by strong free-surface aeration. In turn the entrained air bubbles are expected to interact with the flow turbulence. An experimental study was conducted in supercritical open channel flows down a cascade. Measurements included time-averaged air-water flow properties, air and water chord sizes, and interfacial areas. High levels of turbulence were associated consistently with large air-water interfacial areas. Altogether the study contributes to a better understanding of the basic interfacial processes in re-aeration cascades.
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