TJES: Hussein BS, Jalil SA, .Hydraulic Performance for Combined Weir-Gate Structure. Tikrit Journal of Engineering Sciences 2020; 27(1): 40- 50.

APA: Hussein BS, Jalil SA . (2020). Hydraulic Performance for Combined Weir-Gate Structure. Tikrit Journal of Engineering Sciences, 27 (1), 40- 50.


[1] Alhamid A. A, Husain D, Negm AAM. Discharge Equation for Simultaneous Flow over Rectangular Weirs and below Inverted Triangular Weirs. Arab Gulf J Sci Res 1996;14:595–607.

[2] Negm A . A. M, Al-Brahim AM, Al-hamid AA. Combined-Free Flow over Weirs and below Gates Ecoulements Libres Combinés Sur des Déversoirs et Sous des Vannes. J Hydraul Res 2002;40:359–65.

[3] Hayawi HAA-M, Yahia AAA-G, Hayawi GAA-M. Free Combined Flow over a Triangular Weir and Under Rectangular Gate. Damascus Univ J Vol 2008;24:9–22.

[4] Dehghani A. A., Bashiri H., Shahmirzadi M., Ebrahim M., Ahadpour A.. Experimental Investigation of Scouring in Downstream of Combined Flow over Weirs and below Gates. 33rd IAHR Congr Water Eng a Sustain Environ 2009:3604–9.

 [5] Al-saadi A. K. I. Study Coefficient of Discharge for a Combined Free Flow over Weir and under Gate for Multi Cases. Euphrates J Agric Sci 2013;5:26–35.

[6] Khassaf S. I, Habeeb M. Experimental Investigation for Flow Through Combined Trapezoidal Weir and Rectangular Gate. Int J Sci Eng Res 2014;5:809–14.

[7] Al-Suhili R. H. and Shwana A. J. Prediction of the Discharge Coefficient for a Cipolletti Weir with Rectangular Bottom Opening. Int J Eng Res Appl 2014;4:80–9.

[8] Arvanaghi H, Mahtabi G. Hydraulic Characteristics of Rectangular Combined Sharp-Crest Weir-Gate. Adv Environ Biol 2014;8:32–8.

[9] Al-suhaili R. H., Al-baidhani J. H. and Al-mansori N. J. Hydraulic Characteristics of Flow over Rectangular Weir With Three Rectangular bottom Openings using ANN. J Babylon Univ Sci 2014;22:959–70.

[10] Duru A. Numerical Modelling of Contracted Sharp Crested Weirs. 2014. https://doi.org/10.1201/b21902-103.

[11] Obead I. H., Hamad R. Experimental Study of Coupled Flow Through Combined Weir-Gate Structure. J Babylon Univ Sci 2014;22:151–61.

[12] Parsaie A., Haghiabi AH, Saneie M, Torabi H. Predication of Discharge Coefficient of Cylindrical Weir-Gate using Adaptive Neuro Fuzzy Inference Systems (ANFIS). Front Struct Civ Eng 2017;11:111–22. https://doi.org/10.1007/s11709-016-0354-x.

[13] Qasim R. M., Abdulhussein I. A., Hameed M. A., Matooq Q. A. Experimental Study of Hydraulic Response for Combined Weir-Gate Flow of Composite Shape. Civ Environ Res 2018;10:6–14.

[14] Bos M. G. Discharge measurement structures. 1989. https://doi.org/10.1201/9781315141343-2.

[15] ANSYS CFX-Solver Theory Guide 2011;15317:724–46.

[16] Piradeepan N. An Experimental and Numerical Investigation of a Turbulent Airfoil Wake in a 900 Curved Duct. Thesis, Brunel university, Department of Mechanical Engineering. 2002.

[17] Hirt CW, Nichols BD. Volume of Fluid (VOF) Method for the Dynamics of Free Boundaries. J Comput Phys 1981;39:201–25. https://doi.org/10.1007/s40998-018-0069-1.

[18] Nikseresht AH, Alishahi MM, Emdad H. Generalized Curvilinear Coordinate Interface Tracking in the Computational Domain. Sci Iran 2009;16:64–74.

[19] Orszag SA, Yakhot V. Renormalization Group Analysis of Turbulence. Proc Int Congr Math Berkeley, California, USA 1986:1395–9.

[20] Jamel AA. Numerical Simulation for Estimating Energy Dissipation over Different Types of Stepped Spillways and Evaluate the Performance by Artificial Neural Network. Tikrit J Eng Sci 2018;25:18–26. https://doi.org/10.25130/tjes.25.2.03.

[21] Sarhan SA, Jalil SA. Analysis of Simulation Outputs for the Mutual Effect of Flow in Weir and Gate System. J Univ Babylon Eng Sci 2018;26:48–59. https://doi.org/10.29196/jubes.v26i6.1050.


Tikrit Journal of Engineering Sciences (2020) 27(1) 40- 50.

Hydraulic Performance for Combined Weir-Gate Structure

Bshkoj S..Hussein * Shaker A..Jalil

Water Recourses Engineering Department, College of Engineering, University of Duhok, Kurdistan Region, Iraq

* Corresponding author: bshkoj.hussein@uod.ac

DOI: http://dx.doi.org/10.25130/tjes.27.1.06


Combined hydraulic structure play an important role in controlling flow in open channels. This study was based on experimental and numerical modeling investigations for combined hydraulic structure. For this purpose three physical models of combined sharp crested trapezoidal weir with bottom opening and one physical model of sharp crested trapezoidal weir separately were used and tested by running eight different flow rates over each model. In which three configurations of bottom opening were tested; the first configuration is a rectangular gate while other two configuration were trapezoidal with two different side slopes of (1V:4H) and (1V:2H). The water surface profiles passing through weir-gate system were measured for all thirty two runs of all models which show uniform flow at 2.11h from the upstream of weir. The commercial computational fluid dynamic software ANSYS CFX was used to simulate flow numerically. The verification of the numerical model was based on water surface profiles and discharge which showed acceptable agreement. Also, the results showed that discharge coefficient Cd varies from (0.52-0.58). Furthermore, it was shown that both models with trapezoidal gate pass a higher discharge of flow than the model with rectangular gate with average percentage increase of discharge (40.78% and 19.40%) for trapezoidal side slopes (1H:2V and 1H:4V) respectively. In addition, the combined system with milder trapezoidal side slopes of bottom opening had a better performance for discharging weir flow which is about 40% as compared with traditional one. Finally, the empirical equations for stage-discharge relationship were estimated for all models and discharge coefficients were estimated for all runs.


Keywords: Combined system, Trapezoidal weir, Computational, Fluid dynamic, Gate flow, Discharge coefficient

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