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Evaluating the Effect of Downstream Channel Width Variation on Hydraulic Performance of Arched Plan Stepped Spillways

Author

Listed:
  • Ali Foroudi

    (Quchan University of Technology)

  • Kiyoumars Roushangar

    (University of Tabriz)

  • Mojtaba Saneie

    (Agricultural Research Education and Extension Organization (AREEO))

  • Fatemeh Vojoudi Mehrabani

    (Urmia University)

  • Farhad Alizadeh

    (University of Tabriz
    Research assistant of University of Tabriz)

Abstract

In the present study, a 3D physical model with a scale of 1:50 was developed based on the Germi-Chay dam. The model was used to assess the impact of downstream channel width variation on the efficiency of arched plan stepped spillways. Four ratios of downstream channel width to spillway crest width (Wch/W) were considered which range from 0.214 to 0.286. The hydraulic parameters such as water surface profile, static pressure, discharge coefficient, energy dissipation, and stage-discharge were assessed for each model. Results of the experiments indicated that the values of the discharge coefficient increased with increasing the upstream head values before the submergence state occurrence. However, in this state, the downstream channel width variations had no significant impact on the discharge coefficient. On the other hand, with spillway submergence, influence on discharge coefficient was observed when width variations occurred. Observations showed that an increase in the width ratio caused a decrease in static pressure. In addition, the results of the submerged state clearly showed the effect of the width ratio variations on energy dissipation. For a particular discharge, the highest width ratio led to minimal energy dissipation. Results revealed that the most efficient model was when Wch/W = 0.286. This model was the only one that successfully passed the probable maximum flood discharge in the maximum allowable height (5 m).

Suggested Citation

  • 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.
    • Handle: RePEc:spr:waterr:v:36:y:2022:i:11:d:10.1007_s11269-022-03250-w
    DOI: 10.1007/s11269-022-03250-w
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    References listed on IDEAS

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    1. Öznur Kocaer & Alpaslan Yarar, 2020. "Experimental and Numerical Investigation of Flow Over Ogee Spillway," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 34(13), pages 3949-3965, October.
    2. Elnaz Eghlidi & Gholam-Abbas Barani & Kourosh Qaderi, 2020. "Laboratory Investigation of Stilling Basin Slope Effect on Bed Scour at Downstream of Stepped Spillway: Physical Modeling of Javeh RCC Dam," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 34(1), pages 87-100, January.
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    Cited by:

    1. Parastoo Parsamehr & Alban Kuriqi & Davoud Farsadizadeh & Ali Hosseinzadeh Dalir & Rasoul Daneshfaraz & Rui M. L. Ferreira, 2022. "Hydraulic jump over an adverse slope controlled by different roughness elements," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(14), pages 5729-5749, November.

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