Analysis of Air Bubbles in the Surf Zone Breaking Waves by Imaging Technique

Abstract

The characteristics of bubble entrainment process in the surf zone are discussed. The two-phase flow measurements using two-dimensional imaging technique for bubble measurements, so called Bubble Tracking Velocimetry (BTV) were conducted in the laboratory wave tank. The horizontal and vertical distributions of void fraction and characteristic bubble size were measured and analyzed in detail. The relationship between the void fraction and wave energy dissipation are proposed for the surf zone breaking waves.