应用数学和力学2011，Vol.32Issue(4)：437-444,8.DOI:10.3879/j.issn.1000-0887.2011.04.007
部分植被化矩形河槽紊流时均流速分布分析解
Analytical Solutions for the Transverse Distributions of Stream-Wise Velocity in Turbulent Flow in Rectangular Channel With Partially Vegetations
摘要
Abstract
The lateral distribution of longitudinal velocity in steady uniform turbulent flow in partially vegetated rectangular channel was studied. Plants were assumed as immovable medium. The resistance caused by vegetation was expressed by the theory of poroelasticity. With the consideration of the influence of secondary flow, the momentum equation could be settled. The momentum equation was simplified due to the characters of steady uniform flow. The momentum equation was nondimensionalized to obtain a smooth solution for the lateral distribution of longitudinal velocity. The research shows the secondary current intensity coefficient is in the same order of magnitude under different flow conditions. To verify the model, the acoustic Doppler velocimeter (Micro ADV) is used to measure the velocity field in a rectangular open channel partially with emergent artificial rigid vegetation. Comparisons between the measured data, from both the experiment and the Japanese researchers' paper, and the computed results show that the method did well in predicting the transverse distributions of stream-wise velocity in turbulent flow in rectangular channel with partially vegetations.关键词
多孔介质理论；植被河槽；二次流；横向时均流速分布；矩形河槽Key words
theory of poroelasticity/open channel flow/ vegetation/secondary currents/ depth-averaged velocity distribution分类
建筑与水利引用本文复制引用
槐文信,耿川,曾玉红,杨中华..部分植被化矩形河槽紊流时均流速分布分析解[J].应用数学和力学,2011,32(4):437-444,8.基金项目
国家自然科学基金资助项目(10972163；51079102)；中央高校基本科研业务费专项基金资助项目(2104001) （10972163；51079102）
