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.
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Change history
07 February 2019
This erratum is published to notify a correction in the author’s name. Please take note that changes have been made to the second author, Meysam Nouri. See the corrected version below
<Emphasis Type="Bold">Errata:</Emphasis>
<Emphasis Type="Bold">The original version of this article:</Emphasis>
Farzin Salmasi*, Mysam Nouri**, and John Abraham***
<Emphasis Type="Bold">Was altered as:</Emphasis>
Farzin Salmasi*, Meysam Nouri**, and John Abraham***
The original article has been corrected.
References
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.
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.
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.
Beyrami, M. K. (2006). Water conveyance structure, Isfahan University Press, Iran (in Persian).
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.
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.
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.
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.
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.
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.
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.
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.
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.
Salama, M. (1987). “Flow below sluice gate with sill.” Journal of Egyptian Society of Engineers, vol. 26, no. 4, pp. 31–36.
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.
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).
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.
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Salmasi, F., Nouri, M. & Abraham, J. Laboratory Study of the Effect of Sills on Radial Gate Discharge Coefficient. KSCE J Civ Eng 23, 2117–2125 (2019). https://doi.org/10.1007/s12205-019-1114-y
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DOI: https://doi.org/10.1007/s12205-019-1114-y