对等截面直杆扭转问题，横截面边界上的剪应力计算是件困难的事，也是很重要的研究课题。
The most important issue for the problem of uniform cross-section bar torsion is the calculation of shear stress on the boundary of cross-section, which is very difficult.
结果表明，在剪应力作用下，在界面附近和固定边界附近存在一组边界效应解。
The results show that under shear stresses there are a group of boundary layer solutions near the interface or the fixed boundary.
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.
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