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[1] A set of laboratory experiments of free-surface elevation, water velocity, void fraction, and bubble distribution was conducted simultaneously for regular wave breaking on a plane slope. The data were collected by using a measurement array of wave gages, a dual-tip resistivity void fraction probe, and an acoustic Doppler velocimeter. The measurements were conducted in two different wave flumes to check the scale effects of air entrainment into the water on the wave breaking. The power law scaling of bubble size distribution was measured, and it was found that the bubble size has a power law of d À1.5$À1.7 independent of the location and water depth. The relationship between void fraction and turbulent intensity shows a linear relationship between the void fraction and turbulent intensity.Citation: Mori, N., T. Suzuki, and S. Kakuno (2007), Experimental study of air bubbles and turbulence characteristics in the surf zone,

The air entrainment process of surf zone waves is studied experimentally to understand as a first step of twophase characteristics of surf zone breaking waves. A set of laboratory experiments of free surface elevation, water velocity, void fraction and bubble distribution is conducted simultaneously for regular gravity wave breaking on a plane slope. The in situ data are collected by using a measurement array of wave gages, a dual-tip resistivity void fraction probe and an acoustic Doppler velocimeter. Two-dimensional projected bubble size measurements are conduced by the high speed camera with imaging technique. The experimental data show a linear relationship between the void fraction and turbulent intensity. In addition, the bubble size distributions are proportional to the bubble size to the power of −1 and −3.4 independent of the distance from breaking point and water depth. The length scale separating two power laws is the Hinze scale which corresponds to the wave energy dissipation scale. This result will be important for modeling and implication for the study of surf zone dynamics.