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Dynamical adjustment of two streams past their confluence.

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Title: Dynamical adjustment of two streams past their confluence.
Authors: Cushman-Roisin, Benoit1 (AUTHOR) Benoit.Cushman.Roisin@dartmouth.edu, Constantinescu, George S.2 (AUTHOR) george-constantinescu@uiowa.edu
Source: Journal of Hydraulic Research / Journal de Recherches Hydraulique. Apr2020, Vol. 58 Issue 2, p305-313. 9p.
Subjects: Rivers, Stream function
Abstract: We consider the dynamic adjustment between two streams past their confluence. Lateral mixing is ignored because it is significant only on longer distances. The theory predicts an exponential decay of the difference between the two stream velocities, starting from the point of confluence. Velocity equalization proceeds with the Bernoulli function of each stream decreasing under the action of bottom friction, more so for the faster flow than for the slower flow. The faster stream slows down and, to conserve flowrate, expands laterally, thus squeezing the slower stream, which accelerates, to conserve its flowrate. Thus, the faster stream decelerates while the slower stream accelerates, and the line demarcating the two streams migrates laterally toward the side of the lower velocity. This proceeds until both stream achieve equal velocities. Agreement between theory and data from both laboratory experiments and numerical simulations confirms that lateral mixing is not the mechanism controlling velocity equalization. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Hydraulic Research / Journal de Recherches Hydraulique 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
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Header DbId: egs
DbLabel: Engineering Source
An: 143114323
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Dynamical adjustment of two streams past their confluence.
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  Data: <searchLink fieldCode="AR" term="%22Cushman-Roisin%2C+Benoit%22">Cushman-Roisin, Benoit</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Benoit.Cushman.Roisin@dartmouth.edu</i><br /><searchLink fieldCode="AR" term="%22Constantinescu%2C+George+S%2E%22">Constantinescu, George S.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> george-constantinescu@uiowa.edu</i>
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  Data: We consider the dynamic adjustment between two streams past their confluence. Lateral mixing is ignored because it is significant only on longer distances. The theory predicts an exponential decay of the difference between the two stream velocities, starting from the point of confluence. Velocity equalization proceeds with the Bernoulli function of each stream decreasing under the action of bottom friction, more so for the faster flow than for the slower flow. The faster stream slows down and, to conserve flowrate, expands laterally, thus squeezing the slower stream, which accelerates, to conserve its flowrate. Thus, the faster stream decelerates while the slower stream accelerates, and the line demarcating the two streams migrates laterally toward the side of the lower velocity. This proceeds until both stream achieve equal velocities. Agreement between theory and data from both laboratory experiments and numerical simulations confirms that lateral mixing is not the mechanism controlling velocity equalization. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Hydraulic Research / Journal de Recherches Hydraulique 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: 10.1080/00221686.2019.1573765
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 305
    Subjects:
      – SubjectFull: Rivers
        Type: general
      – SubjectFull: Stream function
        Type: general
    Titles:
      – TitleFull: Dynamical adjustment of two streams past their confluence.
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            NameFull: Cushman-Roisin, Benoit
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            NameFull: Constantinescu, George S.
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            – D: 01
              M: 04
              Text: Apr2020
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              Y: 2020
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              Value: 58
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              Value: 2
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            – TitleFull: Journal of Hydraulic Research / Journal de Recherches Hydraulique
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