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Wave-induced wind fluctuation over the sea

Published online by Cambridge University Press:  29 March 2006

Junsei Kondo ,
Yukio Fujinawa  and
Gen'ichi Naito
Junsei Kondo
Affiliation:
Institute of Coastal Oceanology, National Research Center for Disaster Prevention, Hiratsuka, Japan
Yukio Fujinawa
Affiliation:
Institute of Coastal Oceanology, National Research Center for Disaster Prevention, Hiratsuka, Japan
Gen'ichi Naito
Affiliation:
Institute of Coastal Oceanology, National Research Center for Disaster Prevention, Hiratsuka, Japan
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Abstract

Simultaneous measurements of the sea surface displacement and the longitudinal component of the wind velocity at several levels are reported. They were obtained at the Marine Tower under various conditions, with the air and the waves moving either in the same or in opposite directions. The spectral analysis was made. The cross-correlation coefficient between the sea surface displacement and the wind velocity is large at the layer adjacent to the surface and decreases with increasing mean wind velocity and height. Below a certain level which is several times or several tens of times higher than the height of the critical level where the wind velocity component in the direction of wave propagation equals the wave velocity, the phase lag of the Fourier component of the wind velocity compared with the surface elevation component is about 160 to 190°. Above this layer the wave-induced wind component is very weak and the phase reversal takes place at the height where the mean wind velocity equals 1·2 to 1·5C, C being the phase velocity of wave. When the wind blows in the opposite direction from that of the wave propagation, the wind fluctuation is in phase with respect to the wave motion and the amplitude of wave-induced wind component is relatively large. Some discrepancies are shown between the observations and the predictions from the theory of inviscid fluids.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 51 , Issue 4 , 22 February 1972 , pp. 751 - 771
Copyright
© 1972 Cambridge University Press

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