Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow

Mohamed Ahmed Abdel Hady Eid; Mohammed Ibrahiem Ibrahiem Mohammed

doi:doi:10.11648/j.ajwse.20160202.11

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Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow

Mohamed Ahmed Abdel Hady Eid, Mohammed Ibrahiem Ibrahiem Mohammed

Published in American Journal of Water Science and Engineering (Volume 2, Issue 2)

Received: 9 March 2016 Accepted: 16 March 2016 Published: 1 June 2016

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Abstract

This experimental research aims to study the effect of movable bed scour on the backwater rise upstream bridge piers. The physical models were adjusted for all runs to generate subcritical flow between bridge piers using four different values of downstream Froude number equal 0.0958, 0.107, 0.277 and 0.3527. Different three nose shapes of bridge piers were used, (rectangular, triangular and circular nose), under four different values of contraction ratio (C_r) of; 0.625, 0.70, 0.75 and 0.875 using four discharge values (10 l/s., 11 l/s., 13 l/s. and 15 l/s.). The experimental work was carried out using fine sand sample with geometric mean size (d₅₀) equals 0.167 (classified according to American code). Generally, this research illustrated that the backwater rise upstream bridge piers affected directly with scour propagation around piers. It was appeared that the values of backwater rise using triangular and rectangular noses were greater than the corresponding ones using circular nose by an average percentage of 15.50% and 31.50% respectively. This means that the circular nose gave the least values of backwater rise than other nose shapes, so it is recommend to use it as the best nose shape. It was noticed that the backwater rise decreased gradually with the increasing of run time and the scour hole around piers. It was also showed that the change of Froude number, shape of pier nose and contraction ratio had a noticeable effect on the backwater rise upstream bridge.

Published in	American Journal of Water Science and Engineering (Volume 2, Issue 2)
DOI	10.11648/j.ajwse.20160202.11
Page(s)	6-13
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), 2016. Published by Science Publishing Group

Keywords

Backwater Rise, Movable Bed, Scour, Bridge Piers, and Subcritical Flow

References

[1]	Charbeneau, R. J. and Holley, E. R. "Evaluation of the extent of backwater effects of bridge piers", project of summary report 1805-S, Center for transportation Research, The University of Texus at Austin, pp. 1-4, 2001.
[2]	Goswami, P. and Barua, M. "Slotted pier as a sour control measure", International Journal of Progress in Civil Engineering, Vol. 2, pp. 38-42, 2015.
[3]	Henderson, F. M. “Open channel flow”, Macmillan Publishing Co., Inc., New York, 1966.
[4]	Joseph, N. B. "Hydraulics of Bridge waterways", Text Book, HDS 1, 1978.
[5]	Mohamed, A. "Experimental investigation of local scour around multi-vents bridge piers", Alexandria Engineering Journal, Egypt, Vol. 54, pp. 197-203, 2015.
[6]	Nohani, E. and Ghannad, S. T. "Experimental investigation the impact of collar installation on the cylindrical bridge piers in the rivers bend", Journal of Scientific Research and Development, Nepal, Vol. 2, No. 7, pp. 322-325 pp, 2015.
[7]	Soliman, M. A. “Design of irrigation structures and works”, Al-Azhar University, Cairo, Egypt, 1989.
[8]	Suribabu, C. R., Sabarish, R. M., Narasimhan, R. E. and Chandhru, A. R. "Backwater rise and drag characteristics of bridge piers under subcritical flow conditions", European Water, Vol. 36, pp. 27-35, 2011.
[9]	Sturm, T. W. “Open channel hydraulics”, McGraw Hill Inc., New York, 2001.
[10]	Yarnell, D. L. “Bridge piers as channel obstructions”, U. S. Department of Agriculture, Tech. Bull. No. 442, November 1934.

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APA Style

Mohamed Ahmed Abdel Hady Eid, Mohammed Ibrahiem Ibrahiem Mohammed. (2016). Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow. American Journal of Water Science and Engineering, 2(2), 6-13. https://doi.org/10.11648/j.ajwse.20160202.11

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ACS Style

Mohamed Ahmed Abdel Hady Eid; Mohammed Ibrahiem Ibrahiem Mohammed. Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow. Am. J. Water Sci. Eng. 2016, 2(2), 6-13. doi: 10.11648/j.ajwse.20160202.11

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AMA Style

Mohamed Ahmed Abdel Hady Eid, Mohammed Ibrahiem Ibrahiem Mohammed. Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow. Am J Water Sci Eng. 2016;2(2):6-13. doi: 10.11648/j.ajwse.20160202.11

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@article{10.11648/j.ajwse.20160202.11,
  author = {Mohamed Ahmed Abdel Hady Eid and Mohammed Ibrahiem Ibrahiem Mohammed},
  title = {Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow},
  journal = {American Journal of Water Science and Engineering},
  volume = {2},
  number = {2},
  pages = {6-13},
  doi = {10.11648/j.ajwse.20160202.11},
  url = {https://doi.org/10.11648/j.ajwse.20160202.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajwse.20160202.11},
  abstract = {This experimental research aims to study the effect of movable bed scour on the backwater rise upstream bridge piers. The physical models were adjusted for all runs to generate subcritical flow between bridge piers using four different values of downstream Froude number equal 0.0958, 0.107, 0.277 and 0.3527. Different three nose shapes of bridge piers were used, (rectangular, triangular and circular nose), under four different values of contraction ratio (Cr) of; 0.625, 0.70, 0.75 and 0.875 using four discharge values (10 l/s., 11 l/s., 13 l/s. and 15 l/s.). The experimental work was carried out using fine sand sample with geometric mean size (d50) equals 0.167 (classified according to American code). Generally, this research illustrated that the backwater rise upstream bridge piers affected directly with scour propagation around piers. It was appeared that the values of backwater rise using triangular and rectangular noses were greater than the corresponding ones using circular nose by an average percentage of 15.50% and 31.50% respectively. This means that the circular nose gave the least values of backwater rise than other nose shapes, so it is recommend to use it as the best nose shape. It was noticed that the backwater rise decreased gradually with the increasing of run time and the scour hole around piers. It was also showed that the change of Froude number, shape of pier nose and contraction ratio had a noticeable effect on the backwater rise upstream bridge.},
 year = {2016}
}

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TY  - JOUR
T1  - Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow
AU  - Mohamed Ahmed Abdel Hady Eid
AU  - Mohammed Ibrahiem Ibrahiem Mohammed
Y1  - 2016/06/01
PY  - 2016
N1  - https://doi.org/10.11648/j.ajwse.20160202.11
DO  - 10.11648/j.ajwse.20160202.11
T2  - American Journal of Water Science and Engineering
JF  - American Journal of Water Science and Engineering
JO  - American Journal of Water Science and Engineering
SP  - 6
EP  - 13
PB  - Science Publishing Group
SN  - 2575-1875
UR  - https://doi.org/10.11648/j.ajwse.20160202.11
AB  - This experimental research aims to study the effect of movable bed scour on the backwater rise upstream bridge piers. The physical models were adjusted for all runs to generate subcritical flow between bridge piers using four different values of downstream Froude number equal 0.0958, 0.107, 0.277 and 0.3527. Different three nose shapes of bridge piers were used, (rectangular, triangular and circular nose), under four different values of contraction ratio (Cr) of; 0.625, 0.70, 0.75 and 0.875 using four discharge values (10 l/s., 11 l/s., 13 l/s. and 15 l/s.). The experimental work was carried out using fine sand sample with geometric mean size (d50) equals 0.167 (classified according to American code). Generally, this research illustrated that the backwater rise upstream bridge piers affected directly with scour propagation around piers. It was appeared that the values of backwater rise using triangular and rectangular noses were greater than the corresponding ones using circular nose by an average percentage of 15.50% and 31.50% respectively. This means that the circular nose gave the least values of backwater rise than other nose shapes, so it is recommend to use it as the best nose shape. It was noticed that the backwater rise decreased gradually with the increasing of run time and the scour hole around piers. It was also showed that the change of Froude number, shape of pier nose and contraction ratio had a noticeable effect on the backwater rise upstream bridge.
VL  - 2
IS  - 2
ER  -

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Author Information

Mohamed Ahmed Abdel Hady Eid

Irrigation and Hydraulics Dept., Mansoura University, Mansoura, Egypt
Mohammed Ibrahiem Ibrahiem Mohammed

Irrigation and Hydraulics Dept., Mansoura University, Mansoura, Egypt

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APA Style

Mohamed Ahmed Abdel Hady Eid, Mohammed Ibrahiem Ibrahiem Mohammed. (2016). Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow. American Journal of Water Science and Engineering, 2(2), 6-13. https://doi.org/10.11648/j.ajwse.20160202.11

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ACS Style

Mohamed Ahmed Abdel Hady Eid; Mohammed Ibrahiem Ibrahiem Mohammed. Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow. Am. J. Water Sci. Eng. 2016, 2(2), 6-13. doi: 10.11648/j.ajwse.20160202.11

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AMA Style

Mohamed Ahmed Abdel Hady Eid, Mohammed Ibrahiem Ibrahiem Mohammed. Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow. Am J Water Sci Eng. 2016;2(2):6-13. doi: 10.11648/j.ajwse.20160202.11

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@article{10.11648/j.ajwse.20160202.11,
  author = {Mohamed Ahmed Abdel Hady Eid and Mohammed Ibrahiem Ibrahiem Mohammed},
  title = {Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow},
  journal = {American Journal of Water Science and Engineering},
  volume = {2},
  number = {2},
  pages = {6-13},
  doi = {10.11648/j.ajwse.20160202.11},
  url = {https://doi.org/10.11648/j.ajwse.20160202.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajwse.20160202.11},
  abstract = {This experimental research aims to study the effect of movable bed scour on the backwater rise upstream bridge piers. The physical models were adjusted for all runs to generate subcritical flow between bridge piers using four different values of downstream Froude number equal 0.0958, 0.107, 0.277 and 0.3527. Different three nose shapes of bridge piers were used, (rectangular, triangular and circular nose), under four different values of contraction ratio (Cr) of; 0.625, 0.70, 0.75 and 0.875 using four discharge values (10 l/s., 11 l/s., 13 l/s. and 15 l/s.). The experimental work was carried out using fine sand sample with geometric mean size (d50) equals 0.167 (classified according to American code). Generally, this research illustrated that the backwater rise upstream bridge piers affected directly with scour propagation around piers. It was appeared that the values of backwater rise using triangular and rectangular noses were greater than the corresponding ones using circular nose by an average percentage of 15.50% and 31.50% respectively. This means that the circular nose gave the least values of backwater rise than other nose shapes, so it is recommend to use it as the best nose shape. It was noticed that the backwater rise decreased gradually with the increasing of run time and the scour hole around piers. It was also showed that the change of Froude number, shape of pier nose and contraction ratio had a noticeable effect on the backwater rise upstream bridge.},
 year = {2016}
}

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TY  - JOUR
T1  - Effect of Erodible Bed on Backwater Rise Due to Bridge Piers Only in Case of Subcritical Flow
AU  - Mohamed Ahmed Abdel Hady Eid
AU  - Mohammed Ibrahiem Ibrahiem Mohammed
Y1  - 2016/06/01
PY  - 2016
N1  - https://doi.org/10.11648/j.ajwse.20160202.11
DO  - 10.11648/j.ajwse.20160202.11
T2  - American Journal of Water Science and Engineering
JF  - American Journal of Water Science and Engineering
JO  - American Journal of Water Science and Engineering
SP  - 6
EP  - 13
PB  - Science Publishing Group
SN  - 2575-1875
UR  - https://doi.org/10.11648/j.ajwse.20160202.11
AB  - This experimental research aims to study the effect of movable bed scour on the backwater rise upstream bridge piers. The physical models were adjusted for all runs to generate subcritical flow between bridge piers using four different values of downstream Froude number equal 0.0958, 0.107, 0.277 and 0.3527. Different three nose shapes of bridge piers were used, (rectangular, triangular and circular nose), under four different values of contraction ratio (Cr) of; 0.625, 0.70, 0.75 and 0.875 using four discharge values (10 l/s., 11 l/s., 13 l/s. and 15 l/s.). The experimental work was carried out using fine sand sample with geometric mean size (d50) equals 0.167 (classified according to American code). Generally, this research illustrated that the backwater rise upstream bridge piers affected directly with scour propagation around piers. It was appeared that the values of backwater rise using triangular and rectangular noses were greater than the corresponding ones using circular nose by an average percentage of 15.50% and 31.50% respectively. This means that the circular nose gave the least values of backwater rise than other nose shapes, so it is recommend to use it as the best nose shape. It was noticed that the backwater rise decreased gradually with the increasing of run time and the scour hole around piers. It was also showed that the change of Froude number, shape of pier nose and contraction ratio had a noticeable effect on the backwater rise upstream bridge.
VL  - 2
IS  - 2
ER  -

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