International Journal of Environmental Science and Development
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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).
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).