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A new formula for the elementary discharge coefficient in supercritical flow over side weirs.

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Title: A new formula for the elementary discharge coefficient in supercritical flow over side weirs.
Authors: Jalili Ghazizadeh, Mohammadreza1 (AUTHOR), Mohajeri, Seyed Hossein2 (AUTHOR) hossein.mohajeri@khu.ac.ir, Ezati, Soran3 (AUTHOR)
Source: ISH Journal of Hydraulic Engineering. May2026, Vol. 32 Issue 2, p364-378. 15p.
Subjects: Discharge coefficient, Weirs, Genetic algorithms, Open-channel flow, Froude number, Flow separation, Energy dissipation, Hydraulic engineering
Abstract: Supercritical flow over side weirs is a challenging and complex area of research in hydraulic engineering. Despite the importance of understanding the behavior of supercritical flow over side weirs, few investigations have been conducted on this topic, and many aspects of this phenomenon remain poorly understood. In this study, 86 laboratory tests were conducted to investigate the mechanism of supercritical flow over rectangular sharp-crested side weirs. The results indicate that the average energy loss over the side weir is 11.2%, which emphasizes the significance of accurately predicting the diverted discharge and water level at the end of the weir. A new formula for the elementary discharge coefficient is proposed based on the governing equation of spatially varied supercritical flow. This formulation incorporates key physical phenomena, including energy dissipation and flow separation, and is optimized using a genetic algorithm. The resulting model accurately predicts both the diverted discharge and the water surface profile along the side weir. The model is applicable to sharp-crested rectangular side weirs in rectangular channels operating under supercritical flow conditions within the investigated Froude number range. [ABSTRACT FROM AUTHOR]
Copyright of ISH Journal of Hydraulic Engineering is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 193227033
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: A new formula for the elementary discharge coefficient in supercritical flow over side weirs.
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  Data: <searchLink fieldCode="AR" term="%22Jalili+Ghazizadeh%2C+Mohammadreza%22">Jalili Ghazizadeh, Mohammadreza</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mohajeri%2C+Seyed+Hossein%22">Mohajeri, Seyed Hossein</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> hossein.mohajeri@khu.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Ezati%2C+Soran%22">Ezati, Soran</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22ISH+Journal+of+Hydraulic+Engineering%22">ISH Journal of Hydraulic Engineering</searchLink>. May2026, Vol. 32 Issue 2, p364-378. 15p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Discharge+coefficient%22">Discharge coefficient</searchLink><br /><searchLink fieldCode="DE" term="%22Weirs%22">Weirs</searchLink><br /><searchLink fieldCode="DE" term="%22Genetic+algorithms%22">Genetic algorithms</searchLink><br /><searchLink fieldCode="DE" term="%22Open-channel+flow%22">Open-channel flow</searchLink><br /><searchLink fieldCode="DE" term="%22Froude+number%22">Froude number</searchLink><br /><searchLink fieldCode="DE" term="%22Flow+separation%22">Flow separation</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+dissipation%22">Energy dissipation</searchLink><br /><searchLink fieldCode="DE" term="%22Hydraulic+engineering%22">Hydraulic engineering</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Supercritical flow over side weirs is a challenging and complex area of research in hydraulic engineering. Despite the importance of understanding the behavior of supercritical flow over side weirs, few investigations have been conducted on this topic, and many aspects of this phenomenon remain poorly understood. In this study, 86 laboratory tests were conducted to investigate the mechanism of supercritical flow over rectangular sharp-crested side weirs. The results indicate that the average energy loss over the side weir is 11.2%, which emphasizes the significance of accurately predicting the diverted discharge and water level at the end of the weir. A new formula for the elementary discharge coefficient is proposed based on the governing equation of spatially varied supercritical flow. This formulation incorporates key physical phenomena, including energy dissipation and flow separation, and is optimized using a genetic algorithm. The resulting model accurately predicts both the diverted discharge and the water surface profile along the side weir. The model is applicable to sharp-crested rectangular side weirs in rectangular channels operating under supercritical flow conditions within the investigated Froude number range. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of ISH Journal of Hydraulic Engineering is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1080/09715010.2026.2639977
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 364
    Subjects:
      – SubjectFull: Discharge coefficient
        Type: general
      – SubjectFull: Weirs
        Type: general
      – SubjectFull: Genetic algorithms
        Type: general
      – SubjectFull: Open-channel flow
        Type: general
      – SubjectFull: Froude number
        Type: general
      – SubjectFull: Flow separation
        Type: general
      – SubjectFull: Energy dissipation
        Type: general
      – SubjectFull: Hydraulic engineering
        Type: general
    Titles:
      – TitleFull: A new formula for the elementary discharge coefficient in supercritical flow over side weirs.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Jalili Ghazizadeh, Mohammadreza
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          Name:
            NameFull: Mohajeri, Seyed Hossein
      – PersonEntity:
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            NameFull: Ezati, Soran
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          Dates:
            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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              Value: 32
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            – TitleFull: ISH Journal of Hydraulic Engineering
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