Dispersal of droplets over breaking wind waves under the direct action of wind |
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| Authors: | Momoki Koga |
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| Institution: | (1) Geophysical Institute, Faculty of Science, Tohoku University, 980 Sendai, Japan;(2) Present address: Department of Geophysics, Faculty of Science, Hokkaido University, 060 Sapporo, Japan |
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| Abstract: | This paper describes the dispersal of droplets over breaking wind waves under the direct action of wind, based on a comparison between the actual distribution of droplet velocity and the wind field measured in a wind-wave tank (reference wind speed 16 m sec–1). The velocity distribution of droplets with a diameterd>0.81 mm over breaking wind waves was measured by Koga (1981). In this paper the wind field over breaking wind waves is measured by a flow visualization technique using styrofoam flakes as a tracer. The comparison allows a clear interpretation of droplet movement over the wave profile, and shows that the horizontal movement of the droplets ofd>0.81 mm is approximately determined by acceleration by the wind while their vertical movement is determined by acceleration due to gravity. These observations offer some support for the dispersion model proposed by Koga and Toba (1981). |
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