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Experimental Study on the Hydraulic Performance of Porous Broad-Crested Weirs with Sloping Crests

Author

Listed:
  • Mehrdad Doustkam

    (Shahid Chamran University of Ahvaz)

  • Mostafa Rahmanshahi

    (The Hong Kong Polytechnic University)

  • Manoochehr Fathi-Moghadam

    (Shahid Chamran University of Ahvaz)

  • Alireza Keramat

    (The Hong Kong Polytechnic University)

  • Huan-Feng Duan

    (The Hong Kong Polytechnic University)

Abstract

Due to their superior technical and hydraulic performance and minimal environmental impact, porous weirs have emerged as a feasible alternative to traditional impermeable solid weirs in water transmission and distribution systems. This research study assesses the hydraulic performance of porous broad-crested weirs (PBCWs) with sloping crests. To accomplish this, 30 PBCW models were designed and tested under various operating conditions, including free and submerged flow scenarios. A comparative analysis was conducted to evaluate the performance of PBCWs with and without sloping crests, with the results being compared against a solid broad-crested weir (SBCW) model. The findings revealed that PBCWs with an upstream crest slope exhibited an average increase of 38% in the discharge coefficient compared to similar SBCWs. Similarly, PBCWs with a downstream crest slope demonstrated an average increase of 28% in the discharge coefficient. Additionally, PBCWs with sloping crests showcased heightened sensitivity to changes in tailwater levels compared to PBCWs with horizontal crests, with PBCWs featuring an upstream crest slope being more responsive than those with a downstream crest slope. Finally, leveraging extensive experimental data, empirical equations were derived using nonlinear multi-variable regression and gene-expression programming techniques to accurately represent the free flow discharge coefficient and submerged flow discharge reduction factor.

Suggested Citation

  • Mehrdad Doustkam & Mostafa Rahmanshahi & Manoochehr Fathi-Moghadam & Alireza Keramat & Huan-Feng Duan, 2024. "Experimental Study on the Hydraulic Performance of Porous Broad-Crested Weirs with Sloping Crests," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 38(12), pages 4783-4802, September.
    • Handle: RePEc:spr:waterr:v:38:y:2024:i:12:d:10.1007_s11269-024-03887-9
    DOI: 10.1007/s11269-024-03887-9
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    References listed on IDEAS

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    1. Ali Foroudi & Kiyoumars Roushangar & Mojtaba Saneie & Fatemeh Vojoudi Mehrabani & Farhad Alizadeh, 2022. "Evaluating the Effect of Downstream Channel Width Variation on Hydraulic Performance of Arched Plan Stepped Spillways," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(11), pages 4237-4253, September.
    2. Abdol Mahdi Behroozi & Mohammad Vaghefi, 2022. "Experimental and Numerical Study of the Effect of Zigzag Crests with Various Geometries on the Performance of A-type Piano Key Weirs," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(12), pages 4517-4533, September.
    3. Mostafa Rahmanshahi & Jafar Jafari-Asl & Mahmood Shafai Bejestan & Seyedali Mirjalili, 2023. "A Hybrid Model for Predicting the Energy Dissipation on the Block Ramp Hydraulic Structures," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(8), pages 3187-3209, June.
    4. Rahman Khatibi & Farzin Salmasi & Mohammad Ghorbani & Hakimeh Asadi, 2014. "Modelling Energy Dissipation Over Stepped-gabion Weirs by Artificial Intelligence," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 28(7), pages 1807-1821, May.
    5. Kiyoumars Roushangar & Mahdi Majedi Asl & Saman Shahnazi, 2021. "Hydraulic Performance of PK Weirs Based on Experimental Study and Kernel-based Modeling," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(11), pages 3571-3592, September.
    6. Amiya Abhash & K. K. Pandey, 2021. "Experimental and Numerical Study of Discharge Capacity and Sediment Profile Upstream of Piano Key Weirs with Different Plan Geometries," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(5), pages 1529-1546, March.
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