摘要
通过概化水槽实验模拟野外漂石群梯形分布床面,讨论了低淹没度下的梯形分布的漂石床面上的理论零点取值的变化和摩阻流速取值方法,分析了沿水槽中心到边壁附近的漂石床面上各垂线流速和水流紊动强度的变化,并进一步观察不同流量下,光滑壁面对其紊动强度影响效应的大小。研究表明,y/h在0.3―0.4时,流速分布大致符合对数分布,而在紊流主流区和近床面区,流速偏离对数分布,越靠近边壁,流速越小,且边壁对流速影响强度随着y/h的增加而减小。y/h大于0.4时,边壁效应强度随流量的增加而增加,边壁效应使得床面合紊动强度沿中心到边壁逐渐增加。
Based on flume experiments ,in this paper ,boulder cluster in ladder shaped bed distribution was simulated after field study and methods to determine friction velocity and value of theoretical zero were then discussed under lower submergence degree H/D.Besides,varieties of vertical velocities and Turbulent Intensity from central area to sidewall were also analyzed, and further research was conducted to study smooth sidewall effect on Turbulent Intensity under different discharge.Results show that when y/h is between 0.3--0.4, vertical velocity distribution roughly consistent with the logarithmic distribution but in main turbulent flow and near bed region, they deviate from this law and reduce with the closer distance to sidewall, in addition, influence of sidewall to velocity diminishes as y/h increasing ;when y/h is greater than 0.4, sidewall effect increases with the discharge and has also created a raise of Turbulent Intensity from central region to sidewall area.
出处
《吉林水利》
2018年第1期1-6,共6页
Jilin Water Resources
基金
国家重点研发计划资助项目(2016YFC0402302)
国家自然科学基金重点基金(51639007)
关键词
梯形分布
漂石床面
边壁影响
流速
紊动强度
：ladder shaped distribution
boulder bed
sidewall effect
velocity
Turbulent Intensity
