Strong correlation between the drag coefficient and the shape of the wind sea spectrum over a broad range of wind speeds
Strong correlation between the drag coefficient and the shape of the wind sea spectrum over a broad range of wind speeds
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DOI：
10.1029/2012gl053988
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发表时间：
2012-12
影响因子：
5.2
通讯作者：
N. Takagaki;S. Komori;N. Suzuki;K. Iwano;T. Kuramoto;S. Shimada;R. Kurose;Keiko Takahashi
中科院分区：
文献类型：
--
作者：
N. Takagaki;S. Komori;N. Suzuki;K. Iwano;T. Kuramoto;S. Shimada;R. Kurose;Keiko Takahashi
使用高速风波池和正常风速下的现场测量，对强风条件下风驱动破碎空气-水界面的动量传递进行了实验研究。利用涡流相关法来测量由激光多普勒和相位多普勒风速计测量的风速分量的粗糙度长度和阻力系数。因此，提出了一种新的粗糙度长度和阻力系数模型，用于利用粗糙度长度归一化的风浪能量和显着频率之间的普遍关系来预测正常和强风条件下海面的动量传递。模型表明，在所有风速下，粗糙度长度和阻力系数均由风波的能量和显着频率唯一确定，并且只能根据对数定律区域内的波浪参数和单点平均风速的测量来针对U10给出。
Momentum transfer across the wind‐driven breaking air‐water interface under strong wind conditions was experimentally investigated using a high‐speed wind‐wave tank together with field measurements at normal wind speeds. An eddy correlation method was utilized to measure roughness length and drag coefficient from wind velocity components measured by laser Doppler and phase Doppler anemometers. As a result, a new model for the roughness length and drag coefficient was proposed for predicting momentum transfer across the sea surface under both normal and strong wind conditions using the universal relationship between energy and significant frequency of wind waves normalized by the roughness length. The model shows that the roughness length and drag coefficient are uniquely determined at all wind speeds by energy and significant frequency of wind waves, and they can be given againstU10only from the measurements of the wave parameters and one‐point mean air velocity in the logarithmic law region.