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

Author

Listed:
  • Alireza Khoshkonesh

    (University of Bu Ali Sina)

  • Seyed Hossein Sadeghi

    (Washington State University)

  • Saeed Gohari

    (University of Bu Ali Sina)

  • Somayyeh Karimpour

    (University of Bu Ali Sina)

  • Shahin Oodi

    (University of Bu Ali Sina)

  • Silvia Francesco

    (Niccolò Cusano University)

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.

Suggested Citation

  • Alireza Khoshkonesh & Seyed Hossein Sadeghi & Saeed Gohari & Somayyeh Karimpour & Shahin Oodi & Silvia Francesco, 2023. "Study of Dam-Break Flow Over a Vegetated Channel With and Without a Drop," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(5), pages 2107-2123, March.
    • Handle: RePEc:spr:waterr:v:37:y:2023:i:5:d:10.1007_s11269-023-03480-6
    DOI: 10.1007/s11269-023-03480-6
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    References listed on IDEAS

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    1. Guanjie He & Junrui Chai & Yuan Qin & Zengguang Xu & Shouyi Li, 2020. "Coupled Model of Variable Fuzzy Sets and the Analytic Hierarchy Process and its Application to the Social and Environmental Impact Evaluation of Dam Breaks," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 34(9), pages 2677-2697, July.
    2. George Tsakiris & Vasilis Bellos, 2014. "A Numerical Model for Two-Dimensional Flood Routing in Complex Terrains," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 28(5), pages 1277-1291, March.
    3. Alireza Khoshkonesh & Blaise Nsom & Farhad Bahmanpouri & Fariba Ahmadi Dehrashid & Atefeh Adeli, 2021. "Numerical Study of the Dynamics and Structure of a Partial Dam-Break Flow Using the VOF Method," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(5), pages 1513-1528, March.
    4. George Tsakiris & Mike Spiliotis, 2013. "Dam- Breach Hydrograph Modelling: An Innovative Semi- Analytical Approach," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 27(6), pages 1751-1762, April.
    5. Alibek Issakhov & Aliya Borsikbayeva & Assylbek Issakhov, 2022. "Dam-Break Flow on Mobile Bed Through an Idealized City: Numerical Study," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(11), pages 4425-4446, September.
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