明渠湍流床面附近跃移层内颗粒浓度垂线分布  

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

作　　者：钟德钰[1] 王光谦[1] 王士强[1] 

机构地区：[1]清华大学水利系,北京100084

出　　处：《水动力学研究与进展（A辑）》2001年第4期487-492,共6页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金资助项目 (5 98790 0 6和 5 9890 2 0 0 )

摘　　要：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 。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.

关 键 词：浓度分布 湍流猝发 跃移层 明渠湍流床面 动理学理论 BOLTZMANN方程 挟沙水流 运动颗粒 

分 类 号：TV142[水利工程—水力学及河流动力学] O357.5[理学—流体力学]