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Characteristics of turbulent flow in 3-D pools in the presence of submerged rigid vegetation in channel bed

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Abstract

In this study, the interaction between 3-D bedforms and submerged rigid vegetation has been investigated. Various laboratory experiments were conducted to study the distribution of flow velocity, Reynolds shear stress, turbulent kinetic energy, and skewness coefficients for a constant density of vegetation. Results showed that the velocity profile in the pool section deviates from those in the upstream section of the pool. It has been found that the dip parameter varied between 0.6H and 0.9H depending on various factors including bed roughness, vegetation distribution, and pool entrance/exit slopes. However, scattered vegetation in the pool and differences in slopes created non-uniform flow conditions. Also, in the wake region behind each vegetated element, flow velocity reduced significantly, and small-scale eddies are formed, causing increased perturbations. By decreasing the entrance slope and bed roughness, relatively uniform flow and weaker turbulence was resulted, but the random distribution of vegetated elements counteracted this balance and intensified turbulence. With the decrease in the pool entrance slope, the contribution of sweep event decreased and the contribution of ejection event increased.

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Acknowledgments

The authors express their sincere gratitude to Iran University of Science and Technology for allowing us to use the laboratory facilities such as the flume and ADV. This in-kind support is essential for this study.

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Authors and Affiliations

  1. Natural Disasters Prevention Research Center, Faculty of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

    Kourosh Nosrati, Hossein Afzalimehr & Hamid Reza Reisifar

  2. School of Engineering, University of Northern British Columbia, Prince George, Canada

    Jueyi Sui

Authors
  1. Kourosh Nosrati
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  2. Hossein Afzalimehr
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  3. Jueyi Sui
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  4. Hamid Reza Reisifar
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Corresponding author

Correspondence to Hossein Afzalimehr.

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Conflict of interest: The authors declare that they have no conflict of interest. Jueyi Sui 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

Biography: Kourosh Nosrati (1989-), Male, Ph. D., Research Manager

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Nosrati, K., Afzalimehr, H., Sui, J. et al. Characteristics of turbulent flow in 3-D pools in the presence of submerged rigid vegetation in channel bed. J Hydrodyn 36, 158–169 (2024). https://doi.org/10.1007/s42241-024-0009-7

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  • DOI: https://doi.org/10.1007/s42241-024-0009-7

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