摩阻流速计算公式：U=u/k×ln(z)+B u为距水面z高度处的风速大小，k为卡曼系数。 U为摩阻流速
涨潮阶段床面粗糙长度大于落潮阶段， 涨潮阶段摩阻流速小于落潮阶段。
Roughness length during the flood phase is larger than that during the ebb phase, whilst shear velocity during the flood phase is smaller than that during the ebb phase.
随着风洞宽高比的减小，断面内中垂线上的气流摩阻速度与自由流速的比值以及受风洞边壁影响的气流厚度均增大。
Both the ratio of friction velocity to free stream wind velocity and the thickness of airflow are subject to the sidewall effect, showing the increase trend with the decreasing aspect ratios.
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