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Experimental and Numerical Investigation on Hydraulic Performance of Slit-check Dams in Subcritical Flow Condition

Author

Listed:
  • Mehmet Cihan Aydin

    (Bitlis Eren University)

  • Havva Seda Aytemur

    (State Hydraulic Works 17Th Regional Directorate)

  • Ali Emre Ulu

    (Bitlis Eren University, Department of Civil engineering)

Abstract

Slit-check dams have a flow regulation function under normal flow conditions as well as holding large solid (debris flow control). However, the effects of such structures on flow hydraulics have not been considered much until now. In this study, the effects of slit-check dams on the flow hydraulics were investigated experimentally and numerically. First, the check-dam blocks of different sizes were placed in an open channel and their hydraulic behavior under subcritical flow conditions was experimentally investigated. Then, the blocks used in the experiments were simulated in a three-dimensional numerical environment using Computational Fluid Dynamics (CFD) under the same flow conditions. Water surface profiles, energy dissipation ratios and velocity profiles obtained from numerical and experimental models were presented and discussed. In the verification of the numerical model, it was observed that the relative error percentage found between the models for different discharges in range of 4% and 8%. The results show that a slit-check dam composed of blocks placed in a subcritical flow causes a significant hydraulic jump in the flow. For the 0.8 of the relative block thickness (t/s), the hydraulic jump was found to be the most effective. Total energy loss reached 30%, and the maximum energy loss was obtained for t/s = 1.0 of the relative block thickness. As conclusion that slit-check dams with blocks are effective in flow regulation under flood and normal flow conditions besides holding large solid materials.

Suggested Citation

  • Mehmet Cihan Aydin & Havva Seda Aytemur & Ali Emre Ulu, 2022. "Experimental and Numerical Investigation on Hydraulic Performance of Slit-check Dams in Subcritical Flow Condition," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(5), pages 1693-1710, March.
    • Handle: RePEc:spr:waterr:v:36:y:2022:i:5:d:10.1007_s11269-022-03103-6
    DOI: 10.1007/s11269-022-03103-6
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    References listed on IDEAS

    as
    1. J. Yazdi & M. Sabbaghian Moghaddam & B. Saghafian, 2018. "Optimal Design of Check Dams in Mountainous Watersheds for Flood Mitigation," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 32(14), pages 4793-4811, November.
    2. Badri Shrestha & Hajime Nakagawa & Kenji Kawaike & Yasuyuki Baba & Hao Zhang, 2012. "Driftwood deposition from debris flows at slit-check dams and fans," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 61(2), pages 577-602, March.
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    Cited by:

    1. Ali Emre Ulu & M. Cihan Aydin & Fevzi Önen, 2023. "Energy Dissipation Potentials of Grouped Spur Dikes in an Open Channel," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(11), pages 4491-4506, September.

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