The Wind Field over Wind-waves

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  • 風波の上の風の場
  • フウハ ノ ウエ ノ カゼ ノ バ

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The velocity fluctuations of wind over wind-waves in a wind tunnel are measuredwith a X-type hot-wire anemometer at some heights over the water surface.<BR>The observed vertical profiles of the wave-induced velocity fluctuations and the waveinduced Reynolds stress at the wave spectral peak frequency are different from those expectedfrom the inviscid quasi-laminar model; i. e., the observed vertical profiles of the power spectraldensity of the wave-induced horizontal or vertical velocity fluctuations of wind have theminimum value at the height much heigher than the critical layer, and the value of the waveinduced Reynolds stress is negative at several heights over the water surface. From thecomparison between the experimental results and the numerical solutions of a linear model ofthe turbulent shear flow over the wavy boundary, it is shown that the discrepancy describedabove can be attributed to the atmospheric turbulence.

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