Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport

Lucky Osaro Imagbe

doi:doi:10.11648/j.earth.20211006.14

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Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport

Lucky Osaro Imagbe

Published in Earth Sciences (Volume 10, Issue 6)

Received: 4 October 2021 Accepted: 30 October 2021 Published: 17 November 2021

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Abstract

Understanding sediment transport process requires adequate knowledge of the mechanism of grains motion which is primarily controlled by flow characteristics including the distribution of time-averaged streamwise velocities, Reynold shear stress distributions as well as the turbulence of flow. Knowledge of the velocity profile in both clear and sediment-laden flows provide clues to understanding this sediment transport mechanism. This paper presents the characterisation of turbulent flow velocity profile based on the physical expression of the mixing length theory as originally proposed by Prandtl, O’Brien and Bagnold, for the prediction of flow interaction with suspended sediment grains. The study utilises the most current flow velocity sampling technology to directly sample flow velocity fluctuations in six cases of open channel flume experiments to characterise the turbulent velocity profile and ascertain the turbulence model’s relevance and continuous application in solving sediment grain transport problems. With over 30,000 flow velocity data generated, the analysis demonstrates that, in all six clear water turbulent flows cases investigated, time-averaged velocity versus height is defined in the vicinity of the flow bed by the logarithmic law and well approximated by the turbulence model. Also, modelled and measured vertical streamwise velocities show a significant positive relationship with an R-squared value of almost unity.

Published in	Earth Sciences (Volume 10, Issue 6)
DOI	10.11648/j.earth.20211006.14
Page(s)	281-291
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2021. Published by Science Publishing Group

Keywords

Sediment Grains, Sediment Transport, Velocity Profile, Mixing-length, Flow Turbulence

References

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Lucky Osaro Imagbe. (2021). Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport. Earth Sciences, 10(6), 281-291. https://doi.org/10.11648/j.earth.20211006.14

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ACS Style

Lucky Osaro Imagbe. Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport. Earth Sci. 2021, 10(6), 281-291. doi: 10.11648/j.earth.20211006.14

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AMA Style

Lucky Osaro Imagbe. Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport. Earth Sci. 2021;10(6):281-291. doi: 10.11648/j.earth.20211006.14

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@article{10.11648/j.earth.20211006.14,
  author = {Lucky Osaro Imagbe},
  title = {Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport},
  journal = {Earth Sciences},
  volume = {10},
  number = {6},
  pages = {281-291},
  doi = {10.11648/j.earth.20211006.14},
  url = {https://doi.org/10.11648/j.earth.20211006.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.earth.20211006.14},
  abstract = {Understanding sediment transport process requires adequate knowledge of the mechanism of grains motion which is primarily controlled by flow characteristics including the distribution of time-averaged streamwise velocities, Reynold shear stress distributions as well as the turbulence of flow. Knowledge of the velocity profile in both clear and sediment-laden flows provide clues to understanding this sediment transport mechanism. This paper presents the characterisation of turbulent flow velocity profile based on the physical expression of the mixing length theory as originally proposed by Prandtl, O’Brien and Bagnold, for the prediction of flow interaction with suspended sediment grains. The study utilises the most current flow velocity sampling technology to directly sample flow velocity fluctuations in six cases of open channel flume experiments to characterise the turbulent velocity profile and ascertain the turbulence model’s relevance and continuous application in solving sediment grain transport problems. With over 30,000 flow velocity data generated, the analysis demonstrates that, in all six clear water turbulent flows cases investigated, time-averaged velocity versus height is defined in the vicinity of the flow bed by the logarithmic law and well approximated by the turbulence model. Also, modelled and measured vertical streamwise velocities show a significant positive relationship with an R-squared value of almost unity.},
 year = {2021}
}

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TY  - JOUR
T1  - Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport
AU  - Lucky Osaro Imagbe
Y1  - 2021/11/17
PY  - 2021
N1  - https://doi.org/10.11648/j.earth.20211006.14
DO  - 10.11648/j.earth.20211006.14
T2  - Earth Sciences
JF  - Earth Sciences
JO  - Earth Sciences
SP  - 281
EP  - 291
PB  - Science Publishing Group
SN  - 2328-5982
UR  - https://doi.org/10.11648/j.earth.20211006.14
AB  - Understanding sediment transport process requires adequate knowledge of the mechanism of grains motion which is primarily controlled by flow characteristics including the distribution of time-averaged streamwise velocities, Reynold shear stress distributions as well as the turbulence of flow. Knowledge of the velocity profile in both clear and sediment-laden flows provide clues to understanding this sediment transport mechanism. This paper presents the characterisation of turbulent flow velocity profile based on the physical expression of the mixing length theory as originally proposed by Prandtl, O’Brien and Bagnold, for the prediction of flow interaction with suspended sediment grains. The study utilises the most current flow velocity sampling technology to directly sample flow velocity fluctuations in six cases of open channel flume experiments to characterise the turbulent velocity profile and ascertain the turbulence model’s relevance and continuous application in solving sediment grain transport problems. With over 30,000 flow velocity data generated, the analysis demonstrates that, in all six clear water turbulent flows cases investigated, time-averaged velocity versus height is defined in the vicinity of the flow bed by the logarithmic law and well approximated by the turbulence model. Also, modelled and measured vertical streamwise velocities show a significant positive relationship with an R-squared value of almost unity.
VL  - 10
IS  - 6
ER  -

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Lucky Osaro Imagbe

Department of Geology, University of Jos, Jos, Nigeria

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APA Style

Lucky Osaro Imagbe. (2021). Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport. Earth Sciences, 10(6), 281-291. https://doi.org/10.11648/j.earth.20211006.14

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ACS Style

Lucky Osaro Imagbe. Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport. Earth Sci. 2021, 10(6), 281-291. doi: 10.11648/j.earth.20211006.14

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AMA Style

Lucky Osaro Imagbe. Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport. Earth Sci. 2021;10(6):281-291. doi: 10.11648/j.earth.20211006.14

Copy | Download

@article{10.11648/j.earth.20211006.14,
  author = {Lucky Osaro Imagbe},
  title = {Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport},
  journal = {Earth Sciences},
  volume = {10},
  number = {6},
  pages = {281-291},
  doi = {10.11648/j.earth.20211006.14},
  url = {https://doi.org/10.11648/j.earth.20211006.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.earth.20211006.14},
  abstract = {Understanding sediment transport process requires adequate knowledge of the mechanism of grains motion which is primarily controlled by flow characteristics including the distribution of time-averaged streamwise velocities, Reynold shear stress distributions as well as the turbulence of flow. Knowledge of the velocity profile in both clear and sediment-laden flows provide clues to understanding this sediment transport mechanism. This paper presents the characterisation of turbulent flow velocity profile based on the physical expression of the mixing length theory as originally proposed by Prandtl, O’Brien and Bagnold, for the prediction of flow interaction with suspended sediment grains. The study utilises the most current flow velocity sampling technology to directly sample flow velocity fluctuations in six cases of open channel flume experiments to characterise the turbulent velocity profile and ascertain the turbulence model’s relevance and continuous application in solving sediment grain transport problems. With over 30,000 flow velocity data generated, the analysis demonstrates that, in all six clear water turbulent flows cases investigated, time-averaged velocity versus height is defined in the vicinity of the flow bed by the logarithmic law and well approximated by the turbulence model. Also, modelled and measured vertical streamwise velocities show a significant positive relationship with an R-squared value of almost unity.},
 year = {2021}
}

Copy | Download

TY  - JOUR
T1  - Velocity Profile of Turbulent Clear Water Open-Channel Flows: Implication for Suspended Sediment Grains Transport
AU  - Lucky Osaro Imagbe
Y1  - 2021/11/17
PY  - 2021
N1  - https://doi.org/10.11648/j.earth.20211006.14
DO  - 10.11648/j.earth.20211006.14
T2  - Earth Sciences
JF  - Earth Sciences
JO  - Earth Sciences
SP  - 281
EP  - 291
PB  - Science Publishing Group
SN  - 2328-5982
UR  - https://doi.org/10.11648/j.earth.20211006.14
AB  - Understanding sediment transport process requires adequate knowledge of the mechanism of grains motion which is primarily controlled by flow characteristics including the distribution of time-averaged streamwise velocities, Reynold shear stress distributions as well as the turbulence of flow. Knowledge of the velocity profile in both clear and sediment-laden flows provide clues to understanding this sediment transport mechanism. This paper presents the characterisation of turbulent flow velocity profile based on the physical expression of the mixing length theory as originally proposed by Prandtl, O’Brien and Bagnold, for the prediction of flow interaction with suspended sediment grains. The study utilises the most current flow velocity sampling technology to directly sample flow velocity fluctuations in six cases of open channel flume experiments to characterise the turbulent velocity profile and ascertain the turbulence model’s relevance and continuous application in solving sediment grain transport problems. With over 30,000 flow velocity data generated, the analysis demonstrates that, in all six clear water turbulent flows cases investigated, time-averaged velocity versus height is defined in the vicinity of the flow bed by the logarithmic law and well approximated by the turbulence model. Also, modelled and measured vertical streamwise velocities show a significant positive relationship with an R-squared value of almost unity.
VL  - 10
IS  - 6
ER  -

Copy | Download