而且波浪是海岸地区一个非常重要的海洋水动力因素，波浪作用下底部边界层的流态、底摩阻系数、床面剪应力和泥沙起动的理论还不成熟。
But the theory about the flow regime of the wave boundary layer, the wave friction factor, the bed shear stress and the initiation of sediment motion has not developed very well.
计算中的底部剪切应力由波流边界层模型给出波—流共同作用下的形式。
In calculation, the bottom shear stress under the effect of waves and currents is supplied by the wave-current bottom boundary layer model.
底部相对间隙在0 8～ 2 0之间时，扰流片高度小于边界层厚度时的壁面平均压力比扰流片高度大于边界层厚度时小30 %左右。
When the relative gap height (the ratio of flap height to gap width) is in the range of 0 8-2 0, the mean pressure will reduced 30% if the flap height is smaller than the thickness of boundary layer.
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