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Velocity distribution of flow with submerged flexible vegetations based on mixing-length approach

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Abstract

By choosing a PVC slice to simulate flexible vegetation, we carried out experiments in an open channel with submerged flexible vegetation. A 3D acoustic Doppler velocimeter (micro ADV) was used to measure local flow velocities and Reynolds stress. The results show that hydraulic characteristics in non-vegetation and vegetation layers are totally different. In a region above the vegetation, Reynolds stress distribution is linear, and the measured velocity profile is a classical logarithmic one. Based on the concept of new-riverbed, the river compression parameter representing the impact of vegetation on river is given, and a new assumption of mixing length expression is made. The formula for time-averaged velocity derived from the expression requires less parameters and simple calculation, and is useful in applications.

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Authors and Affiliations

  1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, P. R. China

    Wen-xin Huai  (槐文信), Jie Han  (韩杰), Yu-hong Zeng  (曾玉红), Xiang An  (安翔) & Zhong-dong Qian  (钱忠东)

Authors
  1. Wen-xin Huai  (槐文信)
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  2. Jie Han  (韩杰)
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  3. Yu-hong Zeng  (曾玉红)
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  4. Xiang An  (安翔)
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  5. Zhong-dong Qian  (钱忠东)
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Corresponding author

Correspondence to Wen-xin Huai  (槐文信).

Additional information

(Communicated by Yu-lu LIU)

Project supported by the National Natural Science Foundation of China (Nos. 50679061, 50709025, 50749031)

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Huai, Wx., Han, J., Zeng, Yh. et al. Velocity distribution of flow with submerged flexible vegetations based on mixing-length approach. Appl. Math. Mech.-Engl. Ed. 30, 343–351 (2009). https://doi.org/10.1007/s10483-009-0308-1

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  • DOI: https://doi.org/10.1007/s10483-009-0308-1

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Chinese Library Classification

2000 Mathematics Subject Classification

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