华中科技大学学报（自然科学版）Issue(10)：113-118,6.DOI:10.13245/j.hust.141023
明渠减速流下床面摩阻流速研究
Friction velocity in decelerating open channel flow
摘要
Abstract
Vertical two-dimension numerical simulations were carried out to investigate the shear ve-locity under decelerating non-uniform flow conditions .For estimation of the shear velocity under dif-ferent backwater conditions ,the Reynolds shear stress predicted by the numerical model was extended to the bed surface .Results show that in a backwater condition ,the friction velocity decreases with the increase of water depth when flow rate and bottom slope are fixed ;the friction velocity increases with the increase of flow rate when the water depth and bottom slope are kept constant ;the friction veloci-ty increases with the increase of bottom slope when the same flow rate and water depth are fixed .To meet the needs of practical engineering calculations ,based on the numerical results ,a convenient cal-culation formula for friction velocity was proposed .关键词
明渠流/摩阻流速/雷诺应力/床面切应力/减速流/流速分布Key words
open channel flow/friction velocity/Reynolds shear stress/bed shear stress/decelerating flow/velocity distribution分类
建筑与水利引用本文复制引用
张小峰,金栋,卢新华,金中武..明渠减速流下床面摩阻流速研究[J].华中科技大学学报（自然科学版）,2014,(10):113-118,6.基金项目
国家自然科学基金资助项目（51379155，51079104）；水资源与水利工程科学国家重点实验室开放研究基金资助项目（2013491111）；中国博士后科学基金资助项目（2014M550408）；中央高校基本科研业务费专项资金资助项目（2042014kf0068）． （）
