EXPERIMENTAL STUDY OF AIR BUBBLE DISTRIBUTIONS INDUCED BY WIND-WAVE BREAKING

摘要

An accurate estimation of gas transfer velocity at the air-sea interface is very important to understand environmental mechanisms of the ocean and coastal area. A wind dependent gas transfer model proposed by Liss and Merlivat model has widely used the last decade. The gas transfer velocity of the Liss and Merlivat model increases rapidly when the wind speed exceeds 13m/s. This rapid increase of gas transfer velocity is explained by several reasons such as enhancements of wave breaking induced turbulence, breaking wave induced air bubbles, and sea spray. However, quantitative roles and detail mechanisms of the enhancement are not well known due to the lack of detail measurements. To understand the gas transfer enhancement in high wind speed region, the bubble mediate gas transfer is one of important phenomenon. In order to measure bubble behavior induced by wind wave breaking, the phase-Doppler anemom-etry (PDA) measurement was conducted in wind-wave flume The diameter and velocity components of the air bubbles can were measured using PDA.