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Hydraulic Jump Control Using Stilling Basin with Abruptly Expanding and Negative Step

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Abstract

The present research describes a laboratory study of a hydraulic jump in an abruptly expanding channel and a negative step. The Froude numbers were chosen between 4.5 and 9. This steady hydraulic jump is insensitive to downstream conditions (i.e., tailwater depth). It has an energy dissipation of 45–70%, and therefore it is a good economical design. Four physical models with the expansion ratios of B = 1, 1.33, 1.6, and 2, and two different heights of negative steps (s = 3 and 6 cm) were considered. The results showed that the S-jumps were asymmetric, and the abrupt expansion caused an increase of the jump length and energy loss, while the sequent depth was decreased. By using the negative step, the hydraulic jump was changed to a symmetric shape; also, the hydraulic jump length was significantly reduced when compared to the sudden expansion channel without it; the sequent depth was increased, while the energy loss was decreased. In order to estimate the hydraulic jump characteristics, empirical relations associated with the expansion ratio of basin walls, the relative height of negative steps, and inflow Froude number were proposed based on the experimental data.

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Data Availability Statement

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

The authors received no financial support for the research, authorship, and publication of this article.

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Authors and Affiliations

  1. Department of Civil Engineering, Islamic Azad University, Estahban Branch, Estahban, Iran

    Amir Esmaeil Hamidinejad & Zahra Ghadampour

  2. Department of Water Science and Engineering, College of Agriculture, Isfahan University of Technology, Isfahan, 8415683111, Iran

    Manouchehr Heidarpour

Authors
  1. Amir Esmaeil Hamidinejad
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  2. Manouchehr Heidarpour
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  3. Zahra Ghadampour
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Contributions

The authors confirm contribution to the paper as follows: AEH, MH, and ZG wrote the main manuscript text and AEH prepared Figs. 1, 2, 3, 4, 5, 6, 7, and 8. All authors reviewed the manuscript.

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Correspondence to Manouchehr Heidarpour.

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Hamidinejad, A.E., Heidarpour, M. & Ghadampour, Z. Hydraulic Jump Control Using Stilling Basin with Abruptly Expanding and Negative Step. Iran J Sci Technol Trans Civ Eng 47, 3885–3894 (2023). https://doi.org/10.1007/s40996-023-01143-5

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