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Effect of vegetation on flow structure and dispersion in strongly curved channels

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Abstract

The effect of vegetation on the flow structure and the dispersion in a 180o curved open channel is studied. The Micro ADV is used to measure the flow velocities both in the vegetation cases and the non-vegetation case. It is shown that the velocities in the vegetation area are much smaller than those in the non-vegetation area and a large velocity gradient is generated between the vegetation area and the non-vegetation area. The transverse and longitudinal dispersion coefficients are analyzed based on the experimental data by using the modified N - zone models. It is shown that the effect of the vegetation on the transverse dispersion coefficient is small, involving only changes of a small magnitude, however, since the primary velocities become much more inhomogeneous with the presence of the vegetation, the longitudinal dispersion coefficients are much larger than those in the non-vegetation case.

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Authors and Affiliations

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

    Cheng-guang Li  (李成光), Wan-yun Xue  (薛万云) & Wen-xin Huai  (槐文信)

Authors
  1. Cheng-guang Li  (李成光)
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  2. Wan-yun Xue  (薛万云)
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  3. Wen-xin Huai  (槐文信)
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Corresponding author

Correspondence to Wen-xin Huai  (槐文信).

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 51479007, 11172218 and 11372232), the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20130141110016) and the Fundamental Research Fund for the Central Universities (Grant No. 2012206020204).

Biography: LI Cheng-guang (1988-), Male, Ph. D. Candidate

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Li, Cg., Xue, Wy. & Huai, Wx. Effect of vegetation on flow structure and dispersion in strongly curved channels. J Hydrodyn 27, 286–291 (2015). https://doi.org/10.1016/S1001-6058(15)60483-8

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  • DOI: https://doi.org/10.1016/S1001-6058(15)60483-8

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