Analytical solutions for transverse distributions of stream-wise velocity in turbulent flow in rectangular channel with partial vegetation
Analytical solutions for transverse distributions of stream-wise velocity in turbulent flow in rectangular channel with partial vegetation
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部分植被矩形河道湍流流向速度横向分布解析解
DOI：
10.1007/s10483-011-1430-6
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发表时间：
2011-04-01
影响因子：
4.4
通讯作者：
Yang, Zhong-hua
中科院分区：
文献类型：
--
作者：
Huai, Wen-xin;Geng, Chuan;Yang, Zhong-hua
应用多孔弹性理论研究了部分植被覆盖矩形渠道中恒定均匀紊流的水力特性。植物被假定为不可移动的介质。植被引起的阻力用孔隙弹性理论表示。考虑二次流的影响，动量方程可以简化。对动量方程进行无量纲化，得到纵向速度横向分布的光滑解。为了验证模型，采用声学多普勒流速仪（ADV）对部分有人工刚性植被的矩形明渠流速场进行了测量。实测数据与计算结果的比较表明，该方法能够较好地预测有植被的矩形槽道湍流中流向速度的横向分布。
The theory of poroelasticity is introduced to study the hydraulic properties of the steady uniform turbulent flow in a partially vegetated rectangular channel. Plants are assumed as immovable media. The resistance caused by vegetation is expressed by the theory of poroelasticity. Considering the influence of a secondary flow, the momentum equation can be simplified. The momentum equation is nondimensionalized to obtain a smooth solution for the lateral distribution of the longitudinal velocity. To verify the model, an acoustic Doppler velocimeter (ADV) is used to measure the velocity field in a rectangular open channel partially with emergent artificial rigid vegetation. Comparisons between the measured data and the computed results show that the method can predict the transverse distributions of stream-wise velocities in turbulent flows in a rectangular channel with partial vegetation.