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Hydraulic Performance of PK Weirs Based on Experimental Study and Kernel-based Modeling

Author

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  • Kiyoumars Roushangar

    (University of Tabriz
    University of Tabriz)

  • Mahdi Majedi Asl

    (University of Maragheh)

  • Saman Shahnazi

    (University of Tabriz)

Abstract

A piano key weir (PK weir) is a non-linear, labyrinth-type weir that benefits of a high discharge capacity, and is well suited for low head dams. Determination of the discharge coefficient (Cd) is considered as one of the most important issues, which plays a substantial role in reducing structural and financial damages caused by floods. The main aim of the present study is to experimentally investigate the variations of PK weirs discharge coefficient (Cd) through altering the geometric parameters. The obtained results revealed that in modified PK weirs (by an 11.5% increase in weir height, changing the crest shape, and fillet installation), the Cd values were about 5–15% more than those of the standard PK weirs. The Cd values of the non-contracted weirs were increased by increasing the inlet/outlet width ratio by 1.4, while this relation was adverse for contracted weirs. In the modified PK weirs, the submergence would occur faster than the standard weirs, while the complete submergence would occur later. Moreover, robust kernel-based approaches (kernel extreme learning machine and support vector machine) were successfully employed to the extensive experimental dataset by taking into consideration the Cd as a function of dimensionless geometric variables of PK weirs. The obtained results showed that the ratio of the upstream hydraulic head (H0) to total weir height (P) plays a significant role in the modeling process.

Suggested Citation

  • 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.
    • Handle: RePEc:spr:waterr:v:35:y:2021:i:11:d:10.1007_s11269-021-02905-4
    DOI: 10.1007/s11269-021-02905-4
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    References listed on IDEAS

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    1. Muhammet Emiroglu & Ozgur Kisi, 2013. "Prediction of Discharge Coefficient for Trapezoidal Labyrinth Side Weir Using a Neuro-Fuzzy Approach," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 27(5), pages 1473-1488, March.
    2. 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.
    3. Mahesh Pal & Arun Goel, 2007. "Estimation of Discharge and End Depth in Trapezoidal Channel by Support Vector Machines," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 21(10), pages 1763-1780, October.
    4. 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.
    5. Masood Akbari & Farzin Salmasi & Hadi Arvanaghi & Masoud Karbasi & Davood Farsadizadeh, 2019. "Application of Gaussian Process Regression Model to Predict Discharge Coefficient of Gated Piano Key Weir," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 33(11), pages 3929-3947, September.
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    Cited by:

    1. Wenlong Zhao & Jian Zhang & Wei He & Lin shi & Xuyun Chen, 2022. "Effects of Diversion Wall on the Hydrodynamics and Withdrawal Sediment of A Lateral Intake," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(3), pages 1057-1073, February.
    2. 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.
    3. Veysi Kartal & M. Emin Emiroglu, 2023. "Hydraulic Performance of Sharp-Crested Side Slit Weirs," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(3), pages 1297-1319, February.
    4. 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.

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