Numerical Simulation of the over and through flow Discharge in Broad-Crested Gabion Weirs with side Slopes

Document Type : Research Article

Authors

1 School of Water Sciences Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Department of Civil Engineering, Islamic Azad University-Estahban Branch, Fars, Iran

Abstract

During the recent years, Gabion weirs have been taken into consideration due to their compatibility with the environment, positive effect on river’s water quality and their simple design and implementation. In this research, the hydraulic parameters of flow around broad crested gabion weirs (BCGW) with various side slopes are investigated. Overall, a number of 21 models comprising 7 various geometries each with 3 different porosities including (43%, 44%, 46%) and in different discharges were simulated and studied. Results indicated that the discharge coefficient (Cd), through flow discharge and energy dissipation increased by increasing the average diameter of particles. In addition, Increasing the area of the porous media by changing side angles from 0ᵒ to 60ᵒ reduces the discharge coefficient and through flow discharge. At final stage, experimental equations are presented using Nonlinear Multivariable regression analysis in order to calculate the discharge coefficient and through flow discharge of these structures.

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References

[1] M. Ghomeshi, S. Emamgholizadeh, Fluid Mechanics and Hydraulics, 1 ed., Shahid Chamran University of Ahvaz Press, Ahvaz,, 2010. (in persian)
[2].I. Mohamed, Flow over gabion weirs, Journal of Irrigation and Drainage Engineering, 136(8) (2010) 573-577.
[3] A. Azizi, Meftah-Helghi, M., Ziatabar Ahmadi, M., Golmaei, H., Investigation of the effect of porosity of materials on Energy dissipation in Gabion stepped weirs, Agricultural Sciences and Natural Resources, 15(1) (2008). (in persian)
[4] M. Göğüş, Z. Defne, V. Özkandemir, Broad-Crested Weirs with Rectangular Compound Cross Sections, Journal of Irrigation and Drainage Engineering, 132(3) (2006) 272-280.
[5] W.H. Hager, M. Schwalt, Broad‐Crested Weir, Journal of Irrigation and Drainage Engineering, 120(1) (1994).
[6] M. Ansar, J. Gonzalez-Castro, Submerged Weir Flow at Prototype Gated Spillways, in: World Water & Environmental Resources Congress 2003, 2003, pp. 1-6.
[7] B. Li, V.K. Garga, Theoretical Solution for Seepage Flow in Overtopped Rockfill, Journal of Hydraulic Engineering, 124(2) (1998).
[8] R. Mohammadpour, A.A. Ghani, H.M. Azamathulla, Numerical modeling of 3-D flow on porous broad crested weirs, Applied Mathematical Modelling, 37(22) (2013) 9324-9337.
[9] J. Sargison, A. Percy, Hydraulics of Broad-Crested Weirs with Varying Side Slopes, Journal of Irrigation and Drainage Engineering, 135(1) (2009) 115-118.
[10] J.A. Kells, Spatially varied flow over rockfill embankments, Canadian Journal of Civil Engineering, 20(5) (1993) 820-827.
[11] J.A. Kells, Reply on Discussion of Spatially varied flow over rockfill embankments, Canadian Journal of Civil Engineering, 21(1) (1994) 163-166.
[12] J.M. Leu, H.C. Chan, M.S. Chu, Comparison of turbulent flow over solid and porous structures mounted on the bottom of a rectangular channel, Flow Measurement and Instrumentation, 19(6) (2008) 331-337.
[13] J.-M. Leu, W.-C. Huang, H.-C. Chan, Hydraulic Characteristics of Flow over a Highly Permeable Porous Structure, (2008).
[14] K. Michioku, Maeno, S., Furusawa, T., and Haneda, M., Discharge through a Permeable Rubble Mound Weir, Journal of Hydraulic Engineering, 131(1) (2005) 1-10.
[15] A. Abbaspour, Abdolahpour, M., Salmasi, F., Numerical Simulation of Flow over Rectangular Broad-crestedWeir with Upstream and Downstream Side Slopes Using Fluent Model, Soil and Water Sciences, 23(4) (2013) 265-276.(in persian)
[16] M.A. Sarker, D.G. Rhodes, Calculation of free-surface profile over a rectangular broad-crested weir, Flow Measurement and Instrumentation, 15(4) (2004) 215-219.
[17] P. Varjavand, Farsadizadeh, D., Khosravinia, P., Rafieey. Z., Simulation of Flow Over CylindricalWeirs Using Fluent Model and Comparison with Experimental Data, Soil and Water Sciences, 20/1(2) (2009).(in persian)
[18] M. KHEYRAEI, M. FATHI MOGHADAM, HYDRAULIC CHARACTERISTICS OF THE CRUMP GABION WEIRS FOR FREE FLOW CONDITIONS, Water resources Engineering, 9(29) (2016) 75-86. (in persian)
[19] M. Moradi, Experimental investigation of Flow over Broad-Crested Gabion weirs, Shahid Chamran University of Ahvaz, School of Water Sciences engineering, 2015.(in persian)
[20] Flow Science Inc, Flow-3D User Manual, V11, 2015.
Amirkabir Journal of Civil Engineering
Volume 50, Issue 4
November and December 2018
Pages 619-630

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