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KSCE Journal of Civil Engineering

, Volume 23, Issue 5, pp 2117–2125 | Cite as

Laboratory Study of the Effect of Sills on Radial Gate Discharge Coefficient

  • Farzin SalmasiEmail author
  • Mysam Nouri
  • John Abraham
Hydraulic Engineering
  • 66 Downloads

Abstract

In the present study, the effect of a sill on the discharge coefficient (CD) of radial gates in a free flow condition has been investigated. Different sill shapes were used including a circle, a semicircle, a triangle, a rectangle and a trapezoid. Variable geometric parameters of these sills that were investigated were length, upstream slope, downstream slope and sill height. In addition, the effect of sill location on CD was investigated so that in case 1, with an open gate, the sill was located upstream of the gate. In case 2, the sill is located under the gate. In total, 43 physical models of different shapes sizes of sills were used. The results showed that when the radial gate is open and sills are in upstream of the gates (case 1), the sill operates as a barrier and reduces CD. But in case 2, the sill location has a positive effect on CD. In case 2, the semicircle shape has better performance and increases CD by about 30% compared to the gate without a sill. Also, the rectangular and trapezoidal sills always increase CD. In these sills, increases in CD depend on the sill length to its height (L/Z). Small values of L/Z increase the discharge coefficient up to 13%. Finally, for circular and semicircular sill shapes, two regression equations were presented which can be used by designers.

Keywords

radial gate discharge coefficient sill free condition flow measurement 

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References

  1. Abdelhaleem F. S. F. (2017). “Hydraulics of submerged radial gates with a sill.” ISH Journal of Hydraulic Engineering, pp. 177–186, DOI: 10.1080/09715010.2016.1273798.Google Scholar
  2. Alhamid, A. A. (1999). “Coefficient of discharge for free flow sluice gates.” Journal of King Saud University-Engineering Sciences, vol. 11, no. 1, pp. 33–47, DOI: 10.1016/S1018-3639(18)30989-9.CrossRefGoogle Scholar
  3. Aydin, M. and Emre, A. (2017). “Numerical modelling of sluice gates with different sill types under submerged flow conditions.” Journal of Science and Technology, vol. 7, no. 1, pp. 1–6, DOI: 10.17678/beuscitech.310157.Google Scholar
  4. Beyrami, M. K. (2006). Water conveyance structure, Isfahan University Press, Iran (in Persian).Google Scholar
  5. Bijankhan, M., Ferro, V., and Kouchakzadeh, S. (2013). “New stage-discharge relationships for radial gates.” Journal of Irrigation and Drainage Engineering, vol. 139, no. 5, pp. 378–387, DOI: 10.1061/(ASCE)IR.1943-4774.0000556.CrossRefGoogle Scholar
  6. Buyalski, C. P. (1983). Discharge algorithms for canal radial gates, REC-ERC-83-9, Engineering and Research Center, US Bureau of Reclamation, Denver, CO, USA.Google Scholar
  7. EL-Ganainy, M., Abourehim, M. A., and El-Fitiany, F. (1996). “Radial gates with gate sill for irrigation structure.” Alexandria Engineering Journal, vol. 35, no. 6, pp. 303–309.Google Scholar
  8. El-Saiad, A., Abdel-Hafiz, E., and Hammad, M. (1991). “Effect of sill under gate on the discharge coefficient.” Journal of Egyptian Society of Engineers, Cairo, Egypt, vol. 30, no. 2, pp. 13–16.Google Scholar
  9. Khalili Shayan, H. and Farhoudi, J. (2013). “Effective parameters for calculating discharge coefficient of sluice gates.” Flow Measurement and Instrumentation, vol. 33, pp. 96–105, DOI: 10.1016/j.flowmeasinst. 2013.06.001.CrossRefGoogle Scholar
  10. Negm, A. M., Abdel-Aal, G. M., and Salem, M. N. (2001). “Characteristics of submerged flow below gate with sill in non-prismatic channel.” 6th International Water Technology Conference, Alexandria, Egypt.Google Scholar
  11. Negm, A. M., Alhamid, A., and Elsaid, A. (1998). “Submerged flow below sluice gate with sill.” Egyptian Society of Engineers, vol. 26, no. 4, pp. 31–36.Google Scholar
  12. Saad, Y. (2007). “Effect of circular-crested sill shapes under sluice gate on supercritical free flow characteristics.” Ain Shams University, Engineering Bulletin, vol. 42, no. 4, pp. 161–173.Google Scholar
  13. Saad N. Y. (2011). “Flow under a submerged gate with a circularcrested sill.” Nile Basin Water Science & Engineering Journal, vol. 4, no. 2, pp. 1–9.Google Scholar
  14. Salama, M. (1987). “Flow below sluice gate with sill.” Journal of Egyptian Society of Engineers, vol. 26, no. 4, pp. 31–36.MathSciNetGoogle Scholar
  15. Sarhan, S. A. (2013). “Analysis of submerged flow under a gate with prismatic sill.” ARPN Journal of Engineering and Applied Sciences, vol. 8, no. 10, pp. 849–856.Google Scholar
  16. Shahrokhnia, E. M. and Javan, M. (2005). “Discharge coefficient estimation for arched gates.” Journal of Hydraulic, vol. 1, no. 1, pp. 1–11 (in Persian).Google Scholar
  17. Shaker, A. J. (2014). “Submerged flow analysis below a vertical gate with stepped sill.” Caspian Journal of Applied Sciences Research, vol. 3, no. 5, pp. 41–52.Google Scholar

Copyright information

© Korean Society of Civil Engineers 2019

Authors and Affiliations

  1. 1.Dept. of Water EngineeringUniversity of TabrizTabrizIran
  2. 2.School of EngineeringUniversity of St. ThomasSt. PaulUSA

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