EVOLUTION OF BUBBLY FLOW IN THE SURF ZONE

摘要

In situ visual observations concerning the entrainment of air bubbles after wave breaking were carried out (Kojohama, Ohkishi and Furubira coasts in Japan). This paper presents a discussion of the behavior of air bubbles under breaking waves as well as the effects of these bubbles on the fluid and sediment based on the results of the observations. Typical bubble cloud structures are identified and classified according to the breaker type. Furthermore, the major differences between the three-dimensional eddy structures containing an obliquely descending eddy (ODE) found in the surf zone relative to those in experiments were investigated by tracking the bubbles involved in the vortices.