Investigation of the effect of semicircular corrugated side weir height on discharge coefficient and water surface profile in the main channel

Subject Areas : Article frome a thesis

Fateme Safiloo ¹ , Davod Farsadizade ² , Hadi Arvanaghi ³

1 - Former M.Sc. Student of Water Engineering, College of Agricultural, University of Tabriz, Tabriz, Iran.
2 - Professor of Water Engineering, College of Agricultural, University of Tabriz, Tabriz, Iran.
3 - Associate Prof. of Water Engineering, College of Agricultural, University of Tabriz, Tabriz, Iran.

Received: 2019-10-20 Accepted : 2021-10-26 Published : 2021-10-23

Keywords: Water surface profile, discharge coefficient, Fluent software, Semi-Circular labyrinth side weir, under subcritical flow,

Abstract :

Side weirs are important and practical hydraulic structures in water conveyance systems that are installed on the side wall of the channel to divert excess water from main channels. In this research, the effect of the height of two-side semicircular labyrinth side weir on the discharge coefficient and water surface profile in 3D by using the FLUENT software. side weirs were used in three, four and five cycles with a height of 10,15 and 20 cm and an opening length of 40 cm. The discharge coefficient and water surface profile obtained from this simulation were compared with experimental results for validation. The computed values have a good agreement with the experimental data and the error percentage for the discharge coefficient is between zero and 7% and the relative error was decreased by decreasing of Froude number. Based on the results, as the height of the side weir increases, the rate of water surface fluctuations in the main channel and along the side weir decreases. On average, with every 5 cm reduction in the height of the side weir, the rate of water surface decreases by 3%. Also, the discharge coefficient of the side weir decreases with decreasing congress radius and with increasing the side weir height and upstream Froude number. Therefore, the semicircular labyrinth side weir of three-cycle with height P = 10cm has a higher discharge coefficient than the other side weirs under study.

References:

1. Crookston BM, Tullis BP. Hydraulic Design and Analysis of Labyrinth Weirs. I: Discharge Relationships. J Irrig Drain Eng. 2013;139(5).


2. Lux F. Design Methodology for Labyrinth Weirs. In: Proceedings of the international conference on hydropower [Internet]. 1993 [cited 2021 Sep 2]. p. 1397–407. Available from: https://apps.dtic.mil/sti/pdfs/ADA307714.pdf#page=654


3. Borghei SM, Jalili MR, Ghodsian M. Discharge Coefficient for Sharp-Crested Side Weir in Subcritical Flow. J Hydraul Eng [Internet]. 1999 Oct 1 [cited 2021 Sep 2];125(10):1051–6. Available from: https://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9429%281999%29125%3A10%281051%29


4. LUX, F. Design and Construction of Labyrinth Spillways. 15th Comm Int des Gd Barrages, 1985 [Internet]. 1985 [cited 2021 Sep 2];249–74. Available from: https://ci.nii.ac.jp/naid/10012330557


5. Hay N, Taylor G. Performance and Design of Labyrinth Weirs. J Hydraul Div [Internet]. 1970 Nov 1 [cited 2021 Sep 2];96(11):2337–57. Available from: https://ascelibrary.org/doi/abs/10.1061/JYCEAJ.0002766


6. Qu JQ, Ramamurthy ASRS, Tadayon RT, Chen ZC. Numerical simulation of sharp-crested weir flows. https://doi.org/101139/L09-067 [Internet]. 2009 [cited 2021 Sep 2];36(9):1530–4. Available from: https://cdnsciencepub.com/doi/abs/10.1139/L09-067


7. Ghobadian R, Meratifashi E. Modified theoretical stage-discharge relation for circular sharp-crested weirs. Water Sci Eng. 2012 Mar 1;5(1):26–33.


8. Esmaeilpour L, Farsadizadeh D, Dalir AH. Investigation of Hydraulic Characteristics of One-Side Semi-Circular Labyrinth Side Weir.


9. MARCHI de, G. Saggio Diteoria de Funzionamente Degli Stramazzi Laterali. L’ Energ Elettr [Internet]. 1934 [cited 2021 Sep 2]; Available from: https://ci.nii.ac.jp/naid/10004809588


10. Zahedi Khameneh H, Khodashenas SR, Esmaili K. The Effect of Semi-circular Side Weirs on Hydraulic Properties and Discharge Coefficient of Side Weirs. J River Eng [Internet]. 2014 [cited 2021 Sep 2];5. Available from: http://profdoc.um.ac.ir/paper-abstract-1043278.html


11. Gharehveran, S. S. ; Farsadizadeh, D. ; Dalir AH. Experimental investigation of effects of piles on water surface profile in semi circular labyrinth side weir with one cycle. [Internet]. [cited 2021 Sep 2]. Available from: https://www.cabdirect.org/cabdirect/abstract/20163070227


12. Khalili M, Honar T. Discharge coefficient of semi-circular labyrinth side weir in subcritical flow. Water SA [Internet]. 2017 Aug 2 [cited 2021 Sep 2];43(3):433–41. Available from: https://www.ajol.info/index.php/wsa/article/view/159659


13. Niazkar M, Afzali SH. Application of new hybrid method in developing a new semicircular-weir discharge model. Alexandria Eng J. 2018 Sep 1;57(3):1741–7.


14. Daily JW. Fluid Dynamics by James W. Daily (1966-06-03): Amazon.com: Books [Internet]. [cited 2021 Sep 2]. Available from: https://www.amazon.com/Fluid-Dynamics-James-Daily-1966-06-03/dp/B01FKUSO0C


15. El-Khashab A, Smith KVH. Experimental Investigation of Flow Over Side Weirs. J Hydraul Div [Internet]. 1976 Sep 1 [cited 2021 Sep 2];102(9):1255–68. Available from: https://ascelibrary.org/doi/abs/10.1061/JYCEAJ.0004610


16. Emiroglu ME, Kaya N, Agaccioglu H. Discharge Capacity of Labyrinth Side Weir Located on a Straight Channel. J Irrig Drain Eng [Internet]. 2009 Apr 29 [cited 2021 Sep 2];136(1):37–46. Available from: https://ascelibrary.org/doi/abs/10.1061/%28ASCE%29IR.1943-0000112


17. Mohammadi K, Dalir AH. Experimental Investigation of Hydraulic Jump in Side Weirs. Water Soil Sci [Internet]. 2014 Feb 20 [cited 2021 Sep 3];23(4):117–28. Available from: https://water-soil.tabrizu.ac.ir/article_886.html


18. Emiroglu ME, Agaccioglu H, Kaya N. Discharging capacity of rectangular side weirs in straight open channels. Flow Meas Instrum. 2011 Aug 1;22(4):319–30.


19. N, D. F, A. HD, F. S. EXPERIMENTAL STUDY OF DISCHARGE COEFFICIENT OF TRAPEZOIDAL LABYRINTH SIDE-WEIRS [Internet]. Vol. 23. WATER AND SOIL SCIENCE (AGRICULTURAL SCIENCE); 2013 [cited 2021 Sep 3]. p. 247–57. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=339051