Wind-Generated Current and Phase Speed of Wind Waves

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Abstract
Measurements of drift were made in a wind and wave facility at different elevations below the mean water level. The drift profiles were obtained for reference wind speeds, Ur=3.1, 5.7 and 9.6 m sec−1. The measurement technique involved tracing the movement of small paper disks which were soaked in water to become neutrally buoyant at the elevation of release. A logarithmic drift profile is proposed. The water shear velocity U*w predicts a surface stress, τs=ρwU*w2, in agreement with that obtained from the wind shear velocity, τs=ρaU*a2, where ρa and ρw refer to air and water densities, respectively. The influence of wind on phase speeds of waves was investigated by solving the first-order perturbation problem of the coupled shear flows in air and water. The air velocity profile was described by a logarithmic distribution and the drift profile was described by the proposed drift profile. Adequate agreement is found between the calculated and measured phase speed using Doppler radar in the wavenumb... Abstract Measurements of drift were made in a wind and wave facility at different elevations below the mean water level. The drift profiles were obtained for reference wind speeds, Ur=3.1, 5.7 and 9.6 m sec−1. The measurement technique involved tracing the movement of small paper disks which were soaked in water to become neutrally buoyant at the elevation of release. A logarithmic drift profile is proposed. The water shear velocity U*w predicts a surface stress, τs=ρwU*w2, in agreement with that obtained from the wind shear velocity, τs=ρaU*a2, where ρa and ρw refer to air and water densities, respectively. The influence of wind on phase speeds of waves was investigated by solving the first-order perturbation problem of the coupled shear flows in air and water. The air velocity profile was described by a logarithmic distribution and the drift profile was described by the proposed drift profile. Adequate agreement is found between the calculated and measured phase speed using Doppler radar in the wavenumb...
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