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Features and formulae of sediment incipient motion in vegetated flow environment

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Abstract

Aquatic vegetation is a vital component of natural river ecosystems, playing a crucial role in maintaining ecological balance, providing habitat and improving water quality. However, the presence of vegetation results in increased resistance in vegetated channels compared with non-vegetated channels, rendering traditional sediment movement predictions inadequate for the latter. Consequently, the concept of a vegetation influence factor, denoted by CDah, has been proposed by previous researchers to represent the effect of vegetation on sediment movement in watercourses. In this study, we focus on exploring the vegetation resistance coefficient (CD) among the vegetation influence factors, evaluating two different calculation methods for vegetation resistance coefficient, and presenting two expressions through genetic algorithm analysis to predict the incipient flow velocity of sediment in vegetated watercourses. The predicted values from the new formulae show excellent agreement with measured data, highlighting the high accuracy of the proposed methods in predicting the incipient flow velocity of sediment. Our results provide a solid theoretical basis for understanding the influence of aquatic vegetation on sediment particle movement.

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Acknowledgements

This work was supported by the Talent Program of China Institute of Water Resources and Hydropower Research (Grant No. WE0199A052021).

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Authors and Affiliations

  1. School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China

    Yu-xuan Xu & Shi-bao Zhang

  2. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, 100038, China

    Yu-xuan Xu, Wei-jie Wang, Xue-kai Chen & Hai-ping Zhang

  3. China Three Gorges Corporation, Wuhan, 430010, China

    Han-qing Zhao

Authors
  1. Yu-xuan Xu
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  2. Wei-jie Wang
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  3. Shi-bao Zhang
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  4. Han-qing Zhao
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  5. Xue-kai Chen
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  6. Hai-ping Zhang
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Corresponding author

Correspondence to Wei-jie Wang.

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Conflict of interest: The authors declare that they have no conflict of interest. Wei-jie Wang is editorial board member for the Journal of Hydrodynamics and was not involved in the editorial review, or the decision to publish this article. All authors declare that there are no other competing interests.

Ethical approval: This article does not contain any studies with human participants or animals performed by any of the authors.

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Additional information

Project supported by the Natural Science Foundation of Beijing (Grant No. 8232052), the National Natural Science Foundation of China (Grant No. 51809286).

Biography: Yu-xuan Xu (2000-), Male, Master Candidate

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Xu, Yx., Wang, Wj., Zhang, Sb. et al. Features and formulae of sediment incipient motion in vegetated flow environment. J Hydrodyn (2024). https://doi.org/10.1007/s42241-024-0016-8

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  • DOI: https://doi.org/10.1007/s42241-024-0016-8

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