WIND-GENERATED CURRENT AND PHASE SPEED OF WIND WAVES
WIND-GENERATED CURRENT AND PHASE SPEED OF WIND WAVES
复制标题
风力发电电流和风波相速度
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
O. Shemdin
中科院分区：
文献类型：
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作者：
O. Shemdin
漂移的测量是在低于平均水位的不同海拔高度的风浪设备中进行的。得到了参考风速下的漂移廓线，Ur分别为3.1、5.7和9.6m/s。测量技术包括跟踪小纸盘的运动，这些小纸盘在水中浸泡后，在释放时变得中性浮力。提出了一种对数漂移剖面。水的切变速度U*w预测了一个表面应力TS=Pw U*S，与由风切变速度得到的一致，其中pa和Pw分别表示空气和水的密度。通过求解水-气耦合剪切流的一阶摄动问题，研究了风对波浪相速度的影响。气流速度分布用对数分布描述，漂移分布用所提出的漂移分布描述。在1.9-10 cm-1的波数范围内，用多普勒雷达计算的相速度与测量的相速度有很好的一致性。在0.05-0.5 cm-1的波数范围内，用两个波片测量相速度。波浪是在没有风的情况下机械产生的，波浪仪被隔开以获得相干信号。然后，风被允许吹过海浪，波浪仪之间的距离被增加以保持一致性。波长和频率分别由量规之间的距离和发电机频率获得。测得的相速度随风速的增大而增大，与理论计算一致。
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. The measurement technique involved tracing the movement of small paper discs 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, TS = pw U*S, in agreement with that obtained from the wind shear velocity, Ts = Pa U*li where pa and pw 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 wave number range 1.9 - 10 cm-1. In the wave number range 0.05 - 0.5 cm-1, measurements of phase speeds were obtained by using two wave gages. The waves were mechanically generated without wind and the wave gages were spaced to obtain coherent signals. The wind was then allowed to blow over the waves and the distance between wave gages was increased to maintain coherence. The wave length and frequency were obtained from the distance between the gages and from the generator frequency, respectively. The measured phase speeds were found to increase with wind speed consistent with theoretical computations.