TURBULENCE STRUCTURES OF WIND WATER WAVES

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  • 風波の乱流構造について
  • フウハ ノ ランリュウ コウゾウ ニ ツイテ

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When the wind blows over the water surface, there occur drift currents and wind waves due to the wind shear across an air-water interface. The turbulence measurements of wind layer and water layer were conducted accurately with a Laser Doppler Anemometer (LDA). The turbulent quantities in the air behave similarly to those in flows over flat plates in open-channels. As for the water layer, wave component and turbulence component were separated by a spectral separation method. Turbulence components show universal characteristics on a 2-D gravity wave. It was clarified that turbulent structures and energy budget on both layers are closely related with each other and also that energy transfer through the air-water interface increases as the wind speed becomes larger. In this study, it was concluded that there exists a close relationship between the wind waves and the turbulent structures across the air-water interface in the laboratory wind tunnel.

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