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Study of Dam-Break Flow Over a Vegetated Channel With and Without a Drop

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Abstract

The effects of a drop in a vegetated channel on the flow characteristics during a dam failure were investigated using a numerical approach. A CFD package was used for all dam failure simulations. After performing validation tests, the model was used to predict the flow characteristics during a dam failure over a vegetated channel with positive, negative, or no drop. A positive drop resulted in a backflow into the reservoir with a negative discharge of Qbackflow = − 0.01 m3/s. Even in the channel with no drop, backflow into the reservoir occurred in the last stage due to the drag effect of the vegetation. The maximum discharge occurred at the peak time tpeak = 2.5 s above the drop for all models. The peak discharge decreased from Qpeak = 0.037 m3/s to Qpeak = 0.032 m3/s with increasing positive drop height. However, a negative drop had no significant effect on peak discharge values. In most cases, the maximum flow velocity was around um = 2 m/s. The maximum eddy values decreased by Δωmax = 500 1/s for the positive drops and increased by Δωmax = 700 1/s for negative drops at the middle stage.

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Acknowledgements

The authors acknowledge that this study received no specific grants from public, commercial, or nonprofit entities.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Authors and Affiliations

  1. Department of Water Science and Engineering, University of Bu Ali Sina, Hamedan, 65178, Iran

    Alireza Khoshkonesh, Saeed Gohari, Somayyeh Karimpour & Shahin Oodi

  2. Department of Biological Systems Engineering, Washington State University, Pullman, WA, USA

    Seyed Hossein Sadeghi

  3. Niccolò Cusano University, via Don C. Gnocchi 3, Rome, 00166, Italy

    Silvia Di Francesco

Authors
  1. Alireza Khoshkonesh
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  2. Seyed Hossein Sadeghi
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  3. Saeed Gohari
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Contributions

All authors read and approved the final manuscript. Conceptualization, investigation, methodology, visualization, formal analysis, and writing of the original draft were performed by Alireza Khoshkonesh. The investigation, methodology, formal analysis, improvement, and writing of the manuscript were performed by Prof. Silvia Di Francesco. Investigation and formal analysis were also performed by Prof. Saeed Gohari, Dr Sayed Hossein Sadeghi, Dr Somayyeh Karimpour, and Shahin Oodi.

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Correspondence to Silvia Di Francesco.

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Khoshkonesh, A., Sadeghi, S.H., Gohari, S. et al. Study of Dam-Break Flow Over a Vegetated Channel With and Without a Drop. Water Resour Manage 37, 2107–2123 (2023). https://doi.org/10.1007/s11269-023-03480-6

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