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The whitecap coverage, which is defined as the area of whitecaps per a unit sea surface, was obtained from field imaging measurements. The measurements were made at the storm surge observation tower o...f Shirahama oceanographic observatory, Wakayama, Japan. High-resolution images of whitecaps were taken using a 3CCD digital camera system mounted at 14 m above the mean sea level, and they were stored automatically at a time interval of 1 s. The present results indicate that the 1/3 power of the whitecap coverage increases linearly with the wind speed, and that the coverage is influenced significantly by the near-water air stability and the state of the development of surface waves. In addition, it is observed from our data set that whitecaps are produced most actively under the condition of pure wind sea.続きを見る
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