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IJESD 2021 Vol.12(2): 35-41 ISSN: 2010-0264
doi: 10.18178/ijesd.2021.12.2.1315

Experimental Study on Flow and Sediment Distribution at Off-Take Channel

Lamisa Malik and M. Abdul Matin

Abstract—River off-take is one of the complex features in fluvial systems and the distribution of flow, and sediments along the branches are still a matter of research. This paper deals with a physical simulation on an off-take channel for understanding the flow and sediment distribution in the vicinity. Laboratory-based test runs have been carried out by changing the discharges and the angles off-take. A total of eighteen test runs have been conducted for three discharge conditions with three off-take angles. Two equations for predicting water and sediment discharge ratios have been proposed as a function of Froude number, channel geometry and off-take angel. Flow visualizations have also been carried out in the vicinity of the off-take for understanding erosion and sedimentation pattern. Flow and sediment movement patterns were carefully observed during the simulation and four distinguished zone formations have been noted in the vicinity. Finally, validations of the developed equations have been done with the field data from selected river off-take systems of Bangladesh. Validation results of field data show mean discrepancy ratios of 0.83 for the discharge equation and 0.89 for sediment equation during low flow.

Index Terms—Flow distribution, offtake angles, physical modeling, rivers of Bangladesh, sediment distribution.

Lamisa Malik is with University of Waterloo, ON, CA. she is also with Bangladesh University of Engineering and Technology (BUET), Bangladesh (e-mail: lamisa.m.aurchi005@gmail.com).
M. Abdul Matin is with the Department of Water Resources Engineering at BUET, Bangladesh (e-mail: matinma81@gmail.com).

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Cite: Lamisa Malik and M. Abdul Matin, "Experimental Study on Flow and Sediment Distribution at Off-Take Channel," International Journal of Environmental Science and Development vol. 12, no. 2, pp. 35-41, 2021.

Copyright © 2021 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

General Information

  • ISSN: 2010-0264 (Print)
  • Abbreviated Title: Int. J. Environ. Sci. Dev.
  • Frequency: Monthly
  • DOI: 10.18178/IJESD
  • Editor-in-Chief: Prof. Richard Haynes
  • Executive Editor: Ms. Nancy Y. Liu
  • Indexing: Scopus (since 2019), Google ScholarCrossref, ProQuest, EBSCO, etc. 
  • E-mail: ijesd@ejournal.net

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