坡面浅层明流流态界定方法之商榷

Discussion on flow pattern determination method of shallow flow on slope surface

为了探求坡面薄层水流流态界定方法,从流体力学与泥沙运动学观点出发,对4种不同粗糙尺度床面(光滑玻璃、人工加糙粒径分别为0.075、0.245和0.380mm)、5种不同坡度下坡面薄层水流放水进行试验研究,并对薄层水流阻力规律与明渠水流阻力规律进行了比较分析。在此基础上提出了粘性底层厚度与水深之比作为新的无量纲临界判数,结果表明该判数能更好地反映坡面薄层水流流动型态。

In order to research the flow pattern determination method of shallow flow on slope surface,from the viewpoint of fuild mechanics and sediment transportmechanics, a series of experiments of shallow flow on slope surface were performed on organic glasss lippery bed and artificial rough bed （grain size of sediment is from 0. 075mm to 0.38mm ） with five kinds of gradient. A new method for determinating the flow pattern of shallow flow, which is nondimensional parameter of ratio of viscosity bottom and depth, is derived from analysis of resistance of shallow flow on slope surface and flow resistance. The results show that the new method can reflect flow pattern of shallow flow on slope surface better.