Analytical solutions for transverse distributions of stream-wise velocity in turbulent flow in rectangular channel with partial vegetation |
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Authors: | Wen-xin Huai Chuan Geng Yu-hong Zeng Zhong-hua Yang |
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Institution: | State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University, Wuhan 430072, P. R. China |
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Abstract: | 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. |
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Keywords: | theory of poroelasticity open channel flow vegetation secondary current depth-averaged velocity distribution |
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