Examination of drag coefficient with special reference to the windsea Reynolds number: Conditions with counter and mixed swell |
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| Authors: | Naoya Suzuki Yoshiaki Toba Satoru Komori |
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| Institution: | (1) Earth Observation Research Center, National Space Development Agency of Japan, Tokyo, 104-6023, Japan;(2) Institute of Physical Oceanography, Ocean University of Qingdao, Qingdao, 266003, China;(3) Research Institute for Environmental Sciences and Public Health of Iwate Prefecture, Morioka, 020-0852, Japan |
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| Abstract: | The effect of swell on the drag coefficient, C
D, observed at the Hiratsuka Tower Station, presented by Suzuki et al. (1998, 2002), has been investigated. C
D increases sharply with the windsea Reynolds number, R
B, when there is a counter swell against the windsea direction, and only gradually when the swell comes from a mixture of directions.
In cases where 2-D wave spectra were unavailable (1998, and others), swells showed a scattering effect compared with the pure
windsea case on the C
D-R
B Diagram. R
B is a useful parameter for investigating the effect of swells and further systematic accumulation of appropriate data is needed. |
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