Discharge Coefficient of Symmetrical Stepped and Triangular Labyrinth Side Weirs in a Subcritical Flow Regime
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 149, Issue 4
Abstract
The labyrinth side weir structure is an optimal solution to regulate and divert excess flows across rivers, and irrigation and drainage channels when the opening length of the side weir is limited. Changing the geometry of the side weir is considered one way to improve its efficiency. The present study investigates the hydraulic effects of stepped labyrinth side weirs to increase their discharge capacity. To estimate the outflow over symmetrical stepped labyrinth side weir, the discharge coefficient needs to be determined. Normal triangular labyrinth side weir in one cycle mode has been modified by increasing the crest path using different steps. A total of 417 experiments were conducted on normal and stepped side weirs for various weir opening lengths, weir heights, internal head angles, and hydraulic conditions. The results were analyzed and compared. It was found that efficiency improved, and the discharge coefficient increased as the number of the steps decreased. Furthermore, the water surface profile becomes more uniform with decreasing number of steps. A lower number of steps, smaller head angle, and high weir length produce a higher discharge coefficient by approximately 15%–35% compared to a normal triangular labyrinth side weir; in addition, the Knope length decreases by approximately 40%–70% for the same effective length. Additionally, a reliable equation to estimate the discharge coefficient of the stepped labyrinth side weir was presented. The results of this study can be used to design side weirs with high hydraulic performance when the weir-included angle selected is small or there is a lack of space.
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Data Availability Statement
All data and models that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors would like to acknowledge the University of Babylon for providing all the facilities needed to produce this paper.
References
Abbasi, S., S. Fatemi, A. Ghaderi, and S. Di Francesco. 2021. “The effect of geometric parameters of the antivortex on a triangular labyrinth side weir.” Water 13 (1): 14. https://doi.org/10.3390/w13010014.
Aydin, M. C. 2012. “CFD simulation of free-surface flow over triangular labyrinth side weir.” Adv. Eng. Software 45 (1): 159–166. https://doi.org/10.1016/j.advengsoft.2011.09.006.
Aydin, M. C. 2016. “New approach for estimation of rectangular side weirs discharge in subcritical flow.” J. Irrig. Drain. Eng. 142 (5): 04016012. https://doi.org/10.1061/(ASCE)IR.1943-4774.0001014.
Aydin, M. C., and M. E. Emiroglu. 2013. “Determination of capacity of labyrinth side weir by CFD.” Flow Meas. Instrum. 29 (Mar): 1–8. https://doi.org/10.1016/j.flowmeasinst.2012.09.008.
Aydin, M. C., and M. E. Emiroglu. 2016. “Numerical analysis of subcritical flow over two-cycle trapezoidal labyrinth side weir.” Flow Meas. Instrum. 48 (Apr): 20–28. https://doi.org/10.1016/j.flowmeasinst.2016.01.007.
Aydin, M. C., and K. Kayisli. 2016. “Prediction of discharge capacity over two-cycle labyrinth side weir using ANFIS.” J. Irrig. Drain. Eng. 142 (5): 06016001. https://doi.org/10.1061/(ASCE)IR.1943-4774.0001006.
Aydin, M. C., and A. E. Ulu. 2017. “Antivortex effects on two-cycle trapezoidal labyrinth side weirs.” J. Irrig. Drain. Eng. 143 (7): 06017004. https://doi.org/10.1061/(ASCE)IR.1943-4774.0001182.
Bagheri, S., A. R. Kabiri-Samani, and M. Heidarpour. 2014. “Discharge coefficient of rectangular sharp-crested side weirs, Part I: Traditional weir equation.” Flow Meas. Instrum. 35 (Mar): 109–115. https://doi.org/10.1016/j.flowmeasinst.2013.11.005.
Borghei, S. M., M. R. Jalili, and M. Ghodsian. 1999. “Discharge coefficient for sharp-crested side weir in subcritical flow.” J. Hydraul. Eng. 125 (10): 1051–1056. https://doi.org/10.1061/(ASCE)0733-9429(1999)125:10(1051).
Borghei, S. M., M. A. Nekooie, H. Sadeghian, and M. R. J. Ghazizadeh. 2013. “Triangular labyrinth side weirs with one and two cycles.” Proc. Inst. Civ. Eng. Water Manage. 166 (1): 27–42. https://doi.org/10.1680/wama.11.00032.
Borghei, S. M., and A. Parvaneh. 2011. “Discharge characteristics of a modified oblique side weir in subcritical flow.” Flow Meas. Instrum. 22 (5): 370–376. https://doi.org/10.1016/j.flowmeasinst.2011.04.009.
El-Khashab, A., and K. V. H. Smith. 1976. “Experimental investigation of flow over side weirs.” J. Hydraul. Div. 102 (9): 1255–1268. https://doi.org/10.1061/JYCEAJ.0004610.
Emiroglu, M. E., M. C. Aydin, and N. Kaya. 2014. “Discharge characteristics of a trapezoidal labyrinth side weir with one and two cycles in subcritical flow.” J. Irrig. Drain. Eng. 140 (5): 04014007. https://doi.org/10.1061/(ASCE)IR.1943-4774.0000709.
Emiroglu, M. E., M. Gogus, M. Tunc, and K. Islamoglu. 2017. “Effects of antivortex structures installed on trapezoidal labyrinth side weirs on discharge capacity and scouring.” J. Irrig. Drain. Eng. 143 (6): 04017006. https://doi.org/10.1061/(ASCE)IR.1943-4774.0001158.
Emiroglu, M. E., and N. Kaya. 2011. “Discharge coefficient for trapezoidal labyrinth side weir in subcritical flow.” Water Resour. Manage. 25 (3): 1037–1058. https://doi.org/10.1007/s11269-010-9740-7.
Emiroglu, M. E., N. Kaya, and H. Agaccioglu. 2010. “Discharge capacity of labyrinth side weir located on a straight channel.” J. Irrig. Drain. Eng. 136 (1): 37–46. https://doi.org/10.1061/(ASCE)IR.1943-4774.0000112.
Emiroglu, M. E., N. Kaya, and H. Agaccioglu. 2011. “Closure to ‘Discharge capacity of labyrinth side weir located on a straight channel’ by M. Emin Emiroglu, Nihat Kaya, and Hayrullah Agaccioglu.” J. Irrig. Drain. Eng. 137 (11): 745–746. https://doi.org/10.1061/(ASCE)IR.1943-4774.0000350.
Ghaderi, A., R. Daneshfaraz, M. Dasineh, and S. Di Francesco. 2020a. “Energy dissipation and hydraulics of flow over trapezoidal-triangular labyrinth weirs.” Water 12 (7): 1992. https://doi.org/10.3390/w12071992.
Ghaderi, A., M. Dasineh, S. Abbasi, and J. Abraham. 2020b. “Investigation of trapezoidal sharp-crested side weir discharge coefficients under subcritical flow regimes using CFD.” Appl. Water Sci. 10 (1): 1–12. https://doi.org/10.1007/s13201-019-1112-8.
Hager, W. H. 1987. “Lateral outflow over side weirs.” J. Hydraul. Eng. 113 (4): 491–504. https://doi.org/10.1061/(ASCE)0733-9429(1987)113:4(491).
Karimi, M., M. J. Ghazizadeh, M. Saneie, and J. Attari. 2019. “Flow characteristics over asymmetric triangular labyrinth side weirs.” Flow Meas. Instrum. 68 (Aug): 101574. https://doi.org/10.1016/j.flowmeasinst.2019.101574.
Kaya, N., M. E. Emiroglu, and H. Agaccioglu. 2011. “Discharge coefficient of a semi-elliptical side weir in subcritical flow.” Flow Meas. Instrum. 22 (1): 25–32. https://doi.org/10.1016/j.flowmeasinst.2010.11.002.
Khorchani, M., and O. Blanpain. 2004. “Free surface measurement of flow over side weirs using the video monitoring concept.” Flow Meas. Instrum. 15 (2): 111–117. https://doi.org/10.1016/j.flowmeasinst.2003.09.003.
Mohammed, A. Y. 2015. “Numerical analysis of flow over side weir.” J. King Saud Univ. Eng. Sci. 27 (1): 37–42. https://doi.org/10.1016/j.jksues.2013.03.004.
Nezami, F., D. Farsadizadeh, and M. A. Nekooie. 2015. “Discharge coefficient for trapezoidal side weir.” Alexandria Eng. J. 54 (3): 595–605. https://doi.org/10.1016/j.aej.2015.05.017.
Parvaneh, A., S. M. Borghei, and M. M. J. Ghazizadeh. 2011. “Discussion of ‘Discharge capacity of labyrinth side weir located on a straight channel’ by M. Emin Emiroglu, Nihat Kaya, and Hayrullah Agaccioglu.” J. Irrig. Drain. Eng. 137 (11): 743–745. https://doi.org/10.1061/(ASCE)IR.1943-4774.0000272.
Parvaneh, A., A. Kabiri-Samani, and M. A. Nekooie. 2016. “Discharge coefficient of triangular and asymmetric labyrinth side weirs using the nonlinear PLS method.” J. Irrig. Drain. Eng. 142 (11): 06016010. https://doi.org/10.1061/(ASCE)IR.1943-4774.0001081.
Rahimpour, M., Z. Keshavarz, and M. M. Ahmadi. 2011. “Flow over trapezoidal side weir.” Flow Meas. Instrum. 22 (6): 507–510. https://doi.org/10.1016/j.flowmeasinst.2011.08.004.
Subramanya, K., and S. C. Awasthy. 1972. “Spatially varied flow over side-weirs.” J. Hydraul. Div. 98 (1): 1–10. https://doi.org/10.1061/JYCEAJ.0003188.
Ura, M., Y. Kita, J. Akyama, H. Moriyama, and A. Jha. 2001. “Discharge coefficient of oblique side weirs.” Hydrosci. Hydraul. Eng. 19 (1): 85–96. https://doi.org/https://doi.org/10.2208/prohe.44.545.
Zahedi Khameneh, H., S. R. Khodashenas, and K. Esmaili. 2014. “The effect of increasing the number of cycles on the performance of labyrinth side weir.” Flow Meas. Instrum. 39 (Oct): 35–45. https://doi.org/10.1016/j.flowmeasinst.2014.05.002.
Ziaei, A. N., N. S. Nikou, A. Beyhaghi, F. Attarzadeh, and S. R. Khodashenas. 2019. “Flow simulation over a triangular labyrinth side weir in a rectangular channel.” Prog. Comput. Fluid Dyn. 19 (1): 22–34. https://doi.org/10.1504/PCFD.2019.097599.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 149 • Issue 4 • April 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Apr 29, 2021
Accepted: Jan 20, 2023
Published online: Feb 14, 2023
Published in print: Apr 1, 2023
Discussion open until: Jul 14, 2023
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