摘要
本文首先对河流中的浅滩进行概化,通过水槽试验测出了浅滩上水流的动水压力分布、流速分布和床面剪应力沿程变化.在此基础上根据水动力学基本原理进行了理论分析,应用恒定二元流的基本微分方程式,导出了浅滩上剪应力沿水深分布,水面比降沿程变化和混合长度及紊动交换系数的沿水深分布.最后,对收缩水流与均匀流结构的差异,收缩角及水深的影响等进行了讨论,并对浅滩洪淤枯冲规律进行了解释.
In this paper, the crossing bars are generalized as a model at first, the dynamic pressure distribution, the velocity distribution and the bed shear stress are measured through flume experiments. With theoretical analyses, by using the basic equations of flow momentum, the shear stress distribution along the depth, the water surface slope, the mixing length and the turbulent exchange coefficient distribution along the depth are all calculated. Finally, the effect of convergent angle and water depth on the flow structure is discussed and the law of erosion and deposition of crossing bars is explained.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
1991年第5期94-101,共8页
Journal of Hohai University(Natural Sciences)
关键词
浅滩
河流
非均匀流
流速
分布
crossing bars
non-uniform flow
velocity distribution
shear stress
