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研究了部分植被化矩形河槽紊流的水深平均流速分布.植被被视为不可移动的刚性多孔介质,植被对水流的阻力以多孔介质理论加以考虑,并综合考虑部分植被存在时矩形河槽紊动水流二次流的作用,建立了紊流动量方程.针对恒定均匀流的特点,对动量方程进行了简化,沿水深方向积分并引入参考量,形成无量纲形式的基于多孔介质理论紊动水流控制方程,进而对其求解给出了水深平均纵向时均流速分布的分析解.研究表明,在不同水流条件下的二次流强度系数具有相同的数量级.为验证分析解的正确性,在实验室采用MicoADV测量了部分植被化矩形河槽水流的流速分布.数值解与实验资料和日本学者的相关实验资料的对比表明,该方法可以准确预测部分植被化矩形河槽紊流水流的水深平均流速分布. 相似文献
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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. 相似文献
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