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Flow Structures in the Vicinity of a Submerged Boulder within a Boulder Array.

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Title: Flow Structures in the Vicinity of a Submerged Boulder within a Boulder Array.
Authors: Baki, Abul Basar M.1 baki@ualberta.ca, Wenming Zhang2 wenming@ualberta.ca, Zhu, David Z.3 david.zhu@ualberta.ca, Rajaratnam, Nallamuthu4 nrajaratnam@ualberta.ca
Source: Journal of Hydraulic Engineering. May2017, Vol. 143 Issue 5, p1-13. 13p.
Subjects: Boulders, Turbulent flow, Fishways, Fish habitat improvement, Statistical correlation
Abstract: Boulders are widely used in fish habitat enhancement structures or fish passes. This study provides a detailed measurement of mean and turbulent flow around a boulder in a boulder array under a wake-interference flow condition. It was found that the vertical profiles of normalized streamwise mean velocity and streamwise turbulent intensity were approximately similar around the boulder, but both had different shapes in the upstream, downstream, and left and right sides of the boulder. The profiles of streamwise mean velocity deviated substantially from the classic logarithmic law but agreed with the Coles' wake law fairly well. The profiles of turbulence intensity appeared to have minor deviations from the reported exponential decay profiles in the entire depth downstream of the boulder but only within a certain depth in the upstream and both sides of it. The correlation coefficient of velocity fluctuations was found to differ slightly from the reported exponential relation in the downstream and both sides of the boulder, whereas the difference was substantial in the upstream of it. Empirical relations were proposed for the profiles of streamwise mean velocity, turbulence intensity, and the correlation coefficient of velocity fluctuations. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Hydraulic Engineering is the property of American Society of Civil Engineers 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
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Header DbId: egs
DbLabel: Engineering Source
An: 122261941
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Flow Structures in the Vicinity of a Submerged Boulder within a Boulder Array.
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  Data: <searchLink fieldCode="AR" term="%22Baki%2C+Abul+Basar+M%2E%22">Baki, Abul Basar M.</searchLink><relatesTo>1</relatesTo><i> baki@ualberta.ca</i><br /><searchLink fieldCode="AR" term="%22Wenming+Zhang%22">Wenming Zhang</searchLink><relatesTo>2</relatesTo><i> wenming@ualberta.ca</i><br /><searchLink fieldCode="AR" term="%22Zhu%2C+David+Z%2E%22">Zhu, David Z.</searchLink><relatesTo>3</relatesTo><i> david.zhu@ualberta.ca</i><br /><searchLink fieldCode="AR" term="%22Rajaratnam%2C+Nallamuthu%22">Rajaratnam, Nallamuthu</searchLink><relatesTo>4</relatesTo><i> nrajaratnam@ualberta.ca</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Hydraulic+Engineering%22">Journal of Hydraulic Engineering</searchLink>. May2017, Vol. 143 Issue 5, p1-13. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Boulders%22">Boulders</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulent+flow%22">Turbulent flow</searchLink><br /><searchLink fieldCode="DE" term="%22Fishways%22">Fishways</searchLink><br /><searchLink fieldCode="DE" term="%22Fish+habitat+improvement%22">Fish habitat improvement</searchLink><br /><searchLink fieldCode="DE" term="%22Statistical+correlation%22">Statistical correlation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Boulders are widely used in fish habitat enhancement structures or fish passes. This study provides a detailed measurement of mean and turbulent flow around a boulder in a boulder array under a wake-interference flow condition. It was found that the vertical profiles of normalized streamwise mean velocity and streamwise turbulent intensity were approximately similar around the boulder, but both had different shapes in the upstream, downstream, and left and right sides of the boulder. The profiles of streamwise mean velocity deviated substantially from the classic logarithmic law but agreed with the Coles' wake law fairly well. The profiles of turbulence intensity appeared to have minor deviations from the reported exponential decay profiles in the entire depth downstream of the boulder but only within a certain depth in the upstream and both sides of it. The correlation coefficient of velocity fluctuations was found to differ slightly from the reported exponential relation in the downstream and both sides of the boulder, whereas the difference was substantial in the upstream of it. Empirical relations were proposed for the profiles of streamwise mean velocity, turbulence intensity, and the correlation coefficient of velocity fluctuations. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Hydraulic Engineering is the property of American Society of Civil Engineers 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=122261941
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1061/(ASCE)HY.1943-7900.0001273
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 1
    Subjects:
      – SubjectFull: Boulders
        Type: general
      – SubjectFull: Turbulent flow
        Type: general
      – SubjectFull: Fishways
        Type: general
      – SubjectFull: Fish habitat improvement
        Type: general
      – SubjectFull: Statistical correlation
        Type: general
    Titles:
      – TitleFull: Flow Structures in the Vicinity of a Submerged Boulder within a Boulder Array.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Baki, Abul Basar M.
      – PersonEntity:
          Name:
            NameFull: Wenming Zhang
      – PersonEntity:
          Name:
            NameFull: Zhu, David Z.
      – PersonEntity:
          Name:
            NameFull: Rajaratnam, Nallamuthu
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 05
              Text: May2017
              Type: published
              Y: 2017
          Identifiers:
            – Type: issn-print
              Value: 07339429
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              Value: 143
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              Value: 5
          Titles:
            – TitleFull: Journal of Hydraulic Engineering
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