LABORATORY STUDIES OF WIND-WAVE INTERACTIONS.
HYDRONAUTICS INC LAUREL MD
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It is confirmed that the velocity distribution essentially follows the logarithmic law near the water surface and the velocity-defect law toward the outer edge of the boundary layer. Calculated from these distributions, the wind stresses and surface roughnesses are divided into two groups separated by the occurrence of wave-breaking phenomenon. For sufficiently low wind velocity, U, the surface roughness is dictated by ripples and the wind-stress coefficient varies with U to the -12 power. The average height of the basic gravity wave is proportional to the surface roughness at higher wind velocities the stress coefficient is then proportional to U. In addition, it is found that the Charnocks expression holds only at high wind velocities, and that the constant of proportionality determined from the experiment correlates very well with the field observations. Finally, the wind-stress coefficient is shown to be larger than the friction coefficient for turbulent flow along a solid rough surface the difference is shown to be the wave drag of the wind over the water surface. Author
- Physical and Dynamic Oceanography