水科学进展2016，Vol.27Issue(6)：841-848,8.DOI:10.14042/j.cnki.32.1309.2016.06.006
非均匀沙运动特性试验
Experimental study on non-uniform sediment motion characteristics
摘要
Abstract
The sand in a natural riverbed is usually non-uniform and is considered as the basis for simulating and forecasting the evolution of the natural riverbed, to accurately understand the movement of non-uniform sediment parti-cles. In this study, a flume experiment with non-uniform bed load movement was conducted under uniform flow condi-tion. The particle size range of the bed material was 0. 10—20 mm. The motion process of sediment particles over the rough bed was filmed using a high-speed camera mounted on the top of the flume, and basic motion parameters such as motion trajectories, velocity, and motion/rest time of the non-uniform bed load were obtained. The particle size range of the bed load was 0. 74—8. 19 mm. The results showed the following: the motion direction of bed load is changed by aggregates or large particles on the non-uniform bed surface when compared to results of uniform sediment;the longitudinal velocity decreases and the transverse velocity increases on non-uniform bed load;the longitudinal ve-locity of bed load follows an exponential distribution, the single velocity meets Γ distribution, the transverse velocity and bed load velocity vector angle meets the normal distribution.关键词
非均匀推移质/运动速度/运动轨迹/运动/静止时间/概率分布/水槽试验Key words
non-uniform bed load/motion velocity/motion trajectories/motion/rest time/probability distribution/flume experiment分类
建筑与水利引用本文复制引用
许琳娟,曹文洪,刘春晶..非均匀沙运动特性试验[J].水科学进展,2016,27(6):841-848,8.基金项目
国家自然科学基金资助项目（11472310）；“十二五”国家科技支撑计划资助项目 （）
