明渠湍流床面附近跃移层面颗粒浓度垂线分布

本文以动理学理论的Boltzmann方程为基础，考虑明渠湍流床面附近猝发喷射和清扫运动对跃移层内运动颗粒的不同作用，分析了明渠中泥沙颗粒浓度垂线分布问题，得到了适用于包括跃移层、悬移层在内的统一浓度垂线分布公式。文中着重研究了跃移层内运动颗粒的浓度垂线分布，并将本文结果与实测跃移层内浓度垂线分布及实测跃移层顶部浓度进行了对比，结果表明理论与实验两者符合较好。

Sediment concentration distribution in saltating layer near the bed of open channel flow

With the consideration of the different effects on particles during the ejection and sweeping of turbulence burst occurring in the near bed region of open channel flow, a general formula for the concentration distribution of solid particles was obtained based on the kinetic theory. The formula is applicable to both suspending particles and saltating particles as proper mixing coefficients are chosen. In this paper the mixing length of particles moving in saltating layer was assumed to be proportional to their average jump height and characteristics of the concentration distribution in this layer was further examined. Comparison between the results given by the present formula and measured concentration distribution in saltating layer shows that they agree well with each other.