An Experimental Study of Longitudinal Velocity Distribution at Cross-over and Bend Section of a Compound Meandering Channel

Md. S. M. Khan; Md. Abdullah Al Amin; Md. Mafizur Rahman; Sarder Rafee Musabbir; K. M. Julfikar Tareq

doi:doi:10.11648/j.ajce.20130103.16

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An Experimental Study of Longitudinal Velocity Distribution at Cross-over and Bend Section of a Compound Meandering Channel

Md. S. M. Khan, Md. Abdullah Al Amin, Md. Mafizur Rahman, Sarder Rafee Musabbir, K. M. Julfikar Tareq

Published in American Journal of Civil Engineering (Volume 1, Issue 3)

Received: 25 October 2013 Published: 20 November 2013

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Abstract

Generally, river flow can be schematized as compound meandering channel in which the longitudinal velocity distributions in the crossover and bend section are completely different and quite intricate. Engineers, Planners and Researchers are highly interested in predicting accurately as well as estimating quantitatively and reliably the longitudinal velocity distribution in a compound meandering channel. A laboratory experiment has been conducted in a compound meandering channel with symmetric cross-sections having floodplain width ratios (B/b) of 1.00, 1.67, 2.33, 3.00 and depth ratios (H-h)/h of 0.20, 0.30, 0.35, 0.40 using the large-scale open air facility in the Department of Water Resources Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka. Point velocity data have been collected using an ADV (Acoustic Doppler Velocity Meter) for different depth and width ratio at five different locations of a compound meandering channel. The traditional power law represents a vertical distribution of longitudinal velocity in open channel with maximum value at free surface and with zero at the channel bed. But the velocity distribution in the type of natural or laboratory compound meandering channel does not follow such velocity distribution. The longitudinal velocity distribution of a compound meandering channel shows two characteristics for all cases and depth ratios. In the bend section, velocity increases in the inner bend (convex) and decreases in the outer bend (concave). Similar nature is observed in the floodplain boundary for all cases and depth ratios. In the crossover of a compound meandering channel, velocity increases towards the mid-section and decreases in the boundary of the channel.

Published in	American Journal of Civil Engineering (Volume 1, Issue 3)
DOI	10.11648/j.ajce.20130103.16
Page(s)	124-128
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), 2013. Published by Science Publishing Group

Keywords

Acoustic Doppler Velocity Meter, Depth Ratio, Flood Plain, Meandering Channel, Velocity Distribution, Width Ratio

References

[1]	Toebes, G. H., and Sooky, A. A. (1967). ‘‘Hydraulics of meandering rivers with flood plains.’’ J. Waterw. Harbors Div., Am. Soc. Civ. Eng., 93(2), 213–236.
[2]	Greenhill, R. K., and Sellin, R. H. J. (1993). ‘‘Development of a simple method to predict discharge in compound meandering channels.’’ Proc. Institute Civil Engineers, Water, Merit and Energy, 101, Water Board, (March), 37–44.
[3]	Sellin, R. H. J., Ervine, D. A., and Willetts, B. B. (1993). ‘‘Behavior of meandering two stage channels.’’ Proc. of Institute Civil Engineers Water Maritime and Energy, 101, (June), Paper No. 10106, 99–111.
[4]	Willetts, B. B., and Hardwick, R. I. (1993). ‘‘Stage dependency for over bank flow in meandering channels.’’ Proc., Institute of Civil Engineers Water Maritime and Energy, 101, 45–54.
[5]	Wark, J. B., and James, C. S. (1994). ‘‘An application of new procedure for estimating discharge in meandering overbank flows to field data.’’ 2nd Int. Conf. on River Flood Hydraulics, March 22–25, Wiley, NewYork, 405–414.
[6]	Shiono, K., Muto, Y., Knight, D. W., and Hyde, A. F. L. (1999a). ‘‘Energy losses due to secondary flow and turbulence in meandering channels with over bank flow.’’ J. Hydraul. Res., 37(5), 641–664.
[7]	Patra, K. C., and Kar, S. K. (2000). "Flow interaction of meandering river with floodplains." Journal of Hydraulic Engineering, ASCE, 126(8), 593-604.
[8]	Khatua, K. K., and Patra, K.C. (2007). " Boundary shear stress distribution in compound open channel flow." Journal of Hydraulic Engineering , ISH, 12(3), 39-55.
[9]	Khatua, K. K.(2008). "Interaction of flow and estimation of discharge in two stage meandering compound channels."Ph.D. thesis, NIT, Rourkela, India.
[10]	Mohanty, K. P., Das, S. S., and Khatua, K. K. (2012). "Flow investigations in a wide meandering compound channel." International Journal of Hydraulic Engineering, 1(6), 83-94.
[11]	Amin, M. A. A., Khan, M. S. M., and Islam, M. A. U. (2013). "An experimental study of shear stress distribution in a compound meandering channel."American Journal of Civil Engineering, 1(1), 1-5.
[12]	Shiono, K., and Muto, Y. (1993). ‘‘Secondary flow structure for inbank and overbank flows in trapezoidal meandering channels.’’ Proc., 5th Int. Symp. of Refined Flow Modl. and Turb. Measu., Paris (September), 645–652.
[13]	Muto, Y. (1995). ‘‘Turbulent flow in two stage meander chanenls.’’ PhD thesis, Univ. of Bradford, U.K.
[14]	Morvan, H., Pender, G., Wright, N. G., and Ervine, D. A. (2002). "Three-Dimensional Hydrodynamics of Meandering Compound Channels." Journal of Hydraulic Engineering, ASCE, 128(7), 674-682.
[15]	Patra, K.C., and Kar, S.K., Bhattacharya.A.K. (2004). "Flow and Velocity Distribution in Meandering Compound Channels." Journal of Hydraulic Engineering, ASCE, Vol. 130, No. 5. 398-411.
[16]	Khatua, K. K., Patra, K. C., Sahoo, N. and Nayak, P. P. (2010). "Evaluation of Boundary Shear in a Meandering Channel." Proceedings of Ninth ICHE, IIT Madras,Chennai,India.

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APA Style

Md. S. M. Khan, Md. Abdullah Al Amin, Md. Mafizur Rahman, Sarder Rafee Musabbir, K. M. Julfikar Tareq. (2013). An Experimental Study of Longitudinal Velocity Distribution at Cross-over and Bend Section of a Compound Meandering Channel. American Journal of Civil Engineering, 1(3), 124-128. https://doi.org/10.11648/j.ajce.20130103.16

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ACS Style

Md. S. M. Khan; Md. Abdullah Al Amin; Md. Mafizur Rahman; Sarder Rafee Musabbir; K. M. Julfikar Tareq. An Experimental Study of Longitudinal Velocity Distribution at Cross-over and Bend Section of a Compound Meandering Channel. Am. J. Civ. Eng. 2013, 1(3), 124-128. doi: 10.11648/j.ajce.20130103.16

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AMA Style

Md. S. M. Khan, Md. Abdullah Al Amin, Md. Mafizur Rahman, Sarder Rafee Musabbir, K. M. Julfikar Tareq. An Experimental Study of Longitudinal Velocity Distribution at Cross-over and Bend Section of a Compound Meandering Channel. Am J Civ Eng. 2013;1(3):124-128. doi: 10.11648/j.ajce.20130103.16

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@article{10.11648/j.ajce.20130103.16,
  author = {Md. S. M. Khan and Md. Abdullah Al Amin and Md. Mafizur Rahman and Sarder Rafee Musabbir and K. M. Julfikar Tareq},
  title = {An Experimental Study of Longitudinal Velocity Distribution at Cross-over and Bend Section of a Compound Meandering Channel},
  journal = {American Journal of Civil Engineering},
  volume = {1},
  number = {3},
  pages = {124-128},
  doi = {10.11648/j.ajce.20130103.16},
  url = {https://doi.org/10.11648/j.ajce.20130103.16},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajce.20130103.16},
  abstract = {Generally, river flow can be schematized as compound meandering channel in which the longitudinal velocity distributions in the crossover and bend section are completely different and quite intricate. Engineers, Planners and Researchers are highly interested in predicting accurately as well as estimating quantitatively and reliably the longitudinal velocity distribution in a compound meandering channel. A laboratory experiment has been conducted in a compound meandering channel with symmetric cross-sections having floodplain width ratios (B/b) of 1.00, 1.67, 2.33, 3.00 and depth ratios (H-h)/h of 0.20, 0.30, 0.35, 0.40 using the large-scale open air facility in the Department of Water Resources Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka. Point velocity data have been collected using an ADV (Acoustic Doppler Velocity Meter) for different depth and width ratio at five different locations of a compound meandering channel. The traditional power law represents a vertical distribution of longitudinal velocity in open channel with maximum value at free surface and with zero at the channel bed. But the velocity distribution in the type of natural or laboratory compound meandering channel does not follow such velocity distribution. The longitudinal velocity distribution of a compound meandering channel shows two characteristics for all cases and depth ratios. In the bend section, velocity increases in the inner bend (convex) and decreases in the outer bend (concave). Similar nature is observed in the floodplain boundary for all cases and depth ratios. In the crossover of a compound meandering channel, velocity increases towards the mid-section and decreases in the boundary of the channel.},
 year = {2013}
}

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TY - JOUR
T1 - An Experimental Study of Longitudinal Velocity Distribution at Cross-over and Bend Section of a Compound Meandering Channel
AU - Md. S. M. Khan
AU - Md. Abdullah Al Amin
AU - Md. Mafizur Rahman
AU - Sarder Rafee Musabbir
AU - K. M. Julfikar Tareq
Y1 - 2013/11/20
PY - 2013
N1 - https://doi.org/10.11648/j.ajce.20130103.16
DO - 10.11648/j.ajce.20130103.16
T2 - American Journal of Civil Engineering
JF - American Journal of Civil Engineering
JO - American Journal of Civil Engineering
SP - 124
EP - 128
PB - Science Publishing Group
SN - 2330-8737
UR - https://doi.org/10.11648/j.ajce.20130103.16
AB - Generally, river flow can be schematized as compound meandering channel in which the longitudinal velocity distributions in the crossover and bend section are completely different and quite intricate. Engineers, Planners and Researchers are highly interested in predicting accurately as well as estimating quantitatively and reliably the longitudinal velocity distribution in a compound meandering channel. A laboratory experiment has been conducted in a compound meandering channel with symmetric cross-sections having floodplain width ratios (B/b) of 1.00, 1.67, 2.33, 3.00 and depth ratios (H-h)/h of 0.20, 0.30, 0.35, 0.40 using the large-scale open air facility in the Department of Water Resources Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka. Point velocity data have been collected using an ADV (Acoustic Doppler Velocity Meter) for different depth and width ratio at five different locations of a compound meandering channel. The traditional power law represents a vertical distribution of longitudinal velocity in open channel with maximum value at free surface and with zero at the channel bed. But the velocity distribution in the type of natural or laboratory compound meandering channel does not follow such velocity distribution. The longitudinal velocity distribution of a compound meandering channel shows two characteristics for all cases and depth ratios. In the bend section, velocity increases in the inner bend (convex) and decreases in the outer bend (concave). Similar nature is observed in the floodplain boundary for all cases and depth ratios. In the crossover of a compound meandering channel, velocity increases towards the mid-section and decreases in the boundary of the channel.
VL - 1
IS - 3
ER -

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Author Information

Md. S. M. Khan

Professor, Dept. of Water Resources Engineering, BUET, Dhaka, Bangladesh
Md. Abdullah Al Amin

Assistant Engineer, Bangladesh Water Development Board, Dhaka, Bangladesh
Md. Mafizur Rahman

Professor, Dept. of Civil Engineering, BUET, Dhaka, Bangladesh
Sarder Rafee Musabbir

Undergraduate Student, Dept. of Civil Engineering, BUET, Dhaka, Bangladesh
K. M. Julfikar Tareq

Sub Divisional Engineer, Bangladesh Water Development Board, Dhaka, Bangladesh

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APA Style

Md. S. M. Khan, Md. Abdullah Al Amin, Md. Mafizur Rahman, Sarder Rafee Musabbir, K. M. Julfikar Tareq. (2013). An Experimental Study of Longitudinal Velocity Distribution at Cross-over and Bend Section of a Compound Meandering Channel. American Journal of Civil Engineering, 1(3), 124-128. https://doi.org/10.11648/j.ajce.20130103.16

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ACS Style

Md. S. M. Khan; Md. Abdullah Al Amin; Md. Mafizur Rahman; Sarder Rafee Musabbir; K. M. Julfikar Tareq. An Experimental Study of Longitudinal Velocity Distribution at Cross-over and Bend Section of a Compound Meandering Channel. Am. J. Civ. Eng. 2013, 1(3), 124-128. doi: 10.11648/j.ajce.20130103.16

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AMA Style

Md. S. M. Khan, Md. Abdullah Al Amin, Md. Mafizur Rahman, Sarder Rafee Musabbir, K. M. Julfikar Tareq. An Experimental Study of Longitudinal Velocity Distribution at Cross-over and Bend Section of a Compound Meandering Channel. Am J Civ Eng. 2013;1(3):124-128. doi: 10.11648/j.ajce.20130103.16

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@article{10.11648/j.ajce.20130103.16,
  author = {Md. S. M. Khan and Md. Abdullah Al Amin and Md. Mafizur Rahman and Sarder Rafee Musabbir and K. M. Julfikar Tareq},
  title = {An Experimental Study of Longitudinal Velocity Distribution at Cross-over and Bend Section of a Compound Meandering Channel},
  journal = {American Journal of Civil Engineering},
  volume = {1},
  number = {3},
  pages = {124-128},
  doi = {10.11648/j.ajce.20130103.16},
  url = {https://doi.org/10.11648/j.ajce.20130103.16},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajce.20130103.16},
  abstract = {Generally, river flow can be schematized as compound meandering channel in which the longitudinal velocity distributions in the crossover and bend section are completely different and quite intricate. Engineers, Planners and Researchers are highly interested in predicting accurately as well as estimating quantitatively and reliably the longitudinal velocity distribution in a compound meandering channel. A laboratory experiment has been conducted in a compound meandering channel with symmetric cross-sections having floodplain width ratios (B/b) of 1.00, 1.67, 2.33, 3.00 and depth ratios (H-h)/h of 0.20, 0.30, 0.35, 0.40 using the large-scale open air facility in the Department of Water Resources Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka. Point velocity data have been collected using an ADV (Acoustic Doppler Velocity Meter) for different depth and width ratio at five different locations of a compound meandering channel. The traditional power law represents a vertical distribution of longitudinal velocity in open channel with maximum value at free surface and with zero at the channel bed. But the velocity distribution in the type of natural or laboratory compound meandering channel does not follow such velocity distribution. The longitudinal velocity distribution of a compound meandering channel shows two characteristics for all cases and depth ratios. In the bend section, velocity increases in the inner bend (convex) and decreases in the outer bend (concave). Similar nature is observed in the floodplain boundary for all cases and depth ratios. In the crossover of a compound meandering channel, velocity increases towards the mid-section and decreases in the boundary of the channel.},
 year = {2013}
}

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