Comparative Study of the Discharge Coefficient of Streamlined Weirs

Document Type : Original Article

Authors

1 Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

2 Department of water Engineering, Faculty of Agriculture Engineering, Lorestan University, Khorramabad, Iran.

Abstract

Nowadays, streamlined weirs including circular crested weirs and hydrofoil weirs have been introduced as the weirs with high discharge coefficient (Cd). In this study, the Cd e of circular crested weirs including cylindrical, semicircular and quarter-circular weirs were compared with the hydrofoil weirs. This was done using data published in reputable journals. The trend of the published data showed that the o Cd f of the semicircular and cylindrical crested weirs are close to each other and vary between 1.00 and 1.40. The Cd e of the quarter-crested weirs varies between 1.00 and 1.25 and the Cd of the hydrofoil weirs varies between 0.95 and 1.05. It should be noted that for all models, the range of the ratio of crest height to weir height varied between 0.5 and 2.10. The results showed that the Cd of the semicircular weir was about 30% higher than that of the hydrofoil weir. The Cd of semicircular weirs is about 10 percent higher than that of quarter-circular crested weirs.

Keywords

References

Afaridegan, E., Amanian, N., Parsaie, A., Gharehbaghi, A., 2023. Hydraulic investigation of modified semi-cylindrical weirs. Flow Measurement and Instrumentation, 93: 102405. DOI:https://doi.org/10.1016/j.flowmeasinst.2023.102405
Azimi Amir, H., Rajaratnam, N., Zhu David, Z., 2014. Submerged Flows over Rectangular Weirs of Finite Crest Length. Journal of Irrigation and Drainage Engineering, 140(5): 06014001. DOI:10.1061/(ASCE)IR.1943-4774.0000728
Bagheri, S., Heidarpour, M., 2010. Overflow characteristics of circular-crested weirs. Journal of Hydraulic Research, 48(4): 515-520. DOI:10.1080/00221686.2010.491694
Bagheri, S., Kabiri-Samani, A., 2020. Overflow characteristics of streamlined weirs based on model experimentation. Flow Measurement and Instrumentation, 73: 101720. DOI:https://doi.org/10.1016/j.flowmeasinst.2020.101720
Bos, M.G., 1976. Discharge measurement structures, Ilri.
Carollo, F.G., Ferro, V., 2021. Comments on “Overflow characteristics of streamlined weirs based on model experimentation” by Bagheri S. and Kabiri-Samani A. Flow Measurement and Instrumentation, 78: 101908. DOI:https://doi.org/10.1016/j.flowmeasinst.2021.101908
Castro-Orgaz, O., 2010. Application of potential flow to circular-crested weir. Journal of Hydraulic Research, 48(4): 543-545. DOI:10.1080/00221686.2010.491696
Chanson, H., Montes, J.S., 1998. Overflow Characteristics of Circular Weirs: Effects of Inflow Conditions. Journal of Irrigation and Drainage Engineering, 124(3): 152-162. DOI:10.1061/(ASCE)0733-9437(1998)124:3(152)
Chen, W. et al., 2022. Accurate discharge coefficient prediction of streamlined weirs by coupling linear regression and deep convolutional gated recurrent unit. Engineering Applications of Computational Fluid Mechanics, 16(1): 965-976. DOI:10.1080/19942060.2022.2053786
Garg, S.K., 1987. Irrigation Engineering and Hydraulic Structures. Khanna Publishers.
Gharehbaghi, A. et al., 2023. A comparison of artificial intelligence approaches in predicting discharge coefficient of streamlined weirs. Journal of Hydroinformatics: jh2023063. DOI:10.2166/hydro.2023.063
Haghiabi, A.H., Mohammadzadeh-Habili, J., Parsaie, A., 2018. Development of an evaluation method for velocity distribution over cylindrical weirs using doublet concept. Flow Measurement and Instrumentation, 61: 79-83. DOI:https://doi.org/10.1016/j.flowmeasinst.2018.03.008
Heidarpour, M., Habili, J.M., Haghiabi, A.H., 2008. Application of potential flow to circular-crested weir. Journal of Hydraulic Research, 46(5): 699-702. DOI:10.3826/jhr.2008.3181
Mohammadzadeh-Habili, J., Heidarpour, M., Afzalimehr, H., 2013. Hydraulic characteristics of a new weir entitled of quarter-circular crested weir. Flow Measurement and Instrumentation, 33: 168-178. DOI:https://doi.org/10.1016/j.flowmeasinst.2013.07.002
Parsaie, A., Haghiabi, A.H., 2019. The hydraulic investigation of circular crested stepped spillway. Flow Measurement and Instrumentation, 70: 101624. DOI:https://doi.org/10.1016/j.flowmeasinst.2019.101624
Ramamurthy Amruthur, S., Vo, N.D., 1993. Characteristics of Circular‐Crested Weir. Journal of Hydraulic Engineering, 119(9): 1055-1062. DOI:10.1061/(ASCE)0733-9429(1993)119:9(1055)
Schmocker, L., Halldórsdóttir Berglind, R., Hager Willi, H., 2011. Effect of Weir Face Angles on Circular-Crested Weir Flow. Journal of Hydraulic Engineering, 137(6): 637-643. DOI:10.1061/(ASCE)HY.1943-7900.0000346
Shamsi, Z., Parsaie, A., Haghiabi, A.H., 2022. Optimum hydraulic design of cylindrical weirs. ISH Journal of Hydraulic Engineering, 28(sup1): 86-90. DOI:10.1080/09715010.2019.1683474
Soydan Oksal, N.G., Akoz, M.S., Simsek, O., 2021. Experimental analysis of flow characteristics over hydrofoil weirs. Flow Measurement and Instrumentation, 79: 101867. DOI:https://doi.org/10.1016/j.flowmeasinst.2020.101867
Journal of Hydraulic and Water Engineering
Volume 1, Issue 2
January 2024
Pages 137-142

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