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In order to investigate the transition process of the wind-driven water surface, laboratory experiments were made in a wind-water tunnel with a pipe for the circulation of water. In addition to visual... observation of the water surface, measurements of the wind speed, the wind wave and the drift current in water were carried out in the present experiments. We focused on the relationship between the transition process and some wind-wave parameters, and examined if what kind of parameter is effective for identifying the wave breaking. The behavior of the drift current velocity in water was found to be varied by the occurrence of the micro wave breaking on the surface. It was concluded that the drift current velocity gives an important aspect of the momentum transfer across the water surface, so that it becomes a significant index to describe the transition process of the wind-driven water surface.続きを見る
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