The wind field over wind-waves |
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| Authors: | Hiroshi Ichikawa Norihisa Imasato |
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| Institution: | (1) Geophysical Institute, Faculty of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, 606 Kyoto, Japan |
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| Abstract: | The velocity fluctuations of wind over wind-waves in a wind tunnel are measured with a X-type hot-wire anemometer at some heights over the water surface.The observed vertical profiles of the wave-induced velocity fluctuations and the wave-induced Reynolds stress at the wave spectral peak frequency are different from those expected from the inviscid quasi-laminar model;i.e., the observed vertical profiles of the power spectral density of the wave-induced horizontal or vertical velocity fluctuations of wind have the minimum value at the height much heigher than the critical layer, and the value of the wave-induced Reynolds stress is negative at several heights over the water surface. From the comparison between the experimental results and the numerical solutions of a linear model of the turbulent shear flow over the wavy boundary, it is shown that the discrepancy described above can be attributed to the atmospheric turbulence. |
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