泥沙对水的相对速度和含沙浓度对脉动速度的影响

本文从流体动力学的基本理论出发,讨论了泥沙运动理论中的三个基本问题.(1)泥沙在湍性水流中对水的相对速度.(2)水流挟带泥沙以后脉动速度的改变.(3)泥沙在二维渠道均匀定常流动中含沙量的垂直分布和通常的扩散理论的修正.按照我们理论分析的结果,发现和通常水力学及河道动力学中常用的表达式有一些出入.

The Velocity of Sand Particles Relative to Water and the Variation of Fluctuation Velocity due to the Concentration of Suspended Sand Particles

In this paper, we discuss three fundamental problems of the theory of suspended sand particles based on the theory of fluid dynamics. They are:(l) the relative velocity of sand particles to the surrounding fluid in the turbulent flow,(2) the variation of the velocity fluctuation of the fluid when the suspended sand particles exist,(3) the profile of the vertical distribution of the concentration of the suspended sand particles in two-dimensional uniform steady channel flow and the modification of usual diffusion theory. The results of our theoretical analysis are somewhat different from the corresponding expressions-in the textbooks of hydraulics and river mechanics.