EXPERIMENTAL INVESTIGATION OF THE APPROACH ANGLE EFFECTS ON THE DISCHARGE EFFICIENCY FOR BROAD CRESTED WEIRS

Year 2016, Volume: 17 Issue: 2, 279 - 286, 14.07.2016

Aysegul Ozgenc Aksoy , Mustafa Doğan

https://doi.org/10.18038/btda.48930

Cited By: 2

Abstract

In open channels broad crested weirs are widely used to measure the discharge values. In this study the effect of the approach angle on the discharge efficiency of the broad crested weir was investigated experimentally. Four different approach angles were tested under steady state conditions by using three different discharge values. Experimental results indicate that the discharge coefficient is not only a function of crest length but also a function of approach angle. A modified new non dimensional empirical relation involved approach angle has been proposed. 

Keywords

Broad crested weirs, Discharge coefficient, Approach angle

References

• Hager WH, Schwalt M. Broad-Crested Weir. Journal of Irrigation and Drainage Engineering 1994; 120(1): 13-26.
• Fritz HM, Hager WH. Hydraulics of Embankment Weirs. Journal of Hydraulic Engineering 1998; 124(9): 963-971.
• Farhoudi J, Alami S. Slope Effect on Discharge Efficiency in Rectangular Broad-crested Weir with Sloped Upstream Face. International Journal of Civil Engineering 2005; 3(1): 58-65.
• Gogus M, Defne Z., Ozkandemir V. Broad-Crested Weirs with Rectangular Compound Cross Sections” Journal of Irrigation and Drainage Engineering 2006; 132(3): 272-280.
• Sargison JE, Percy A. Hydraulics of Broad-Crested Weirs with Varying Side Slopes. Journal of Irrigation and Drainage Engineering 2009; 135(1): 115-118.
• Goodarzi E, Farhoudi J, Shokri N. Flow Characteristics of Rectangular Broad-Crested Weirs with Sloped Upstream Face. Journal of Hydrology and Hydromechanics 2012; 60(2): 87-100.
• Parilkova J, Riha J, Zachoval Z. The Influence of Roughness on the Discharge Coefficient of a Broad-Crested Weir. Journal of Hydrology and Hydromechanics 2012; 60(2): 101-104.
• Jalil SA, Ibrahim SS, Jafer RA. Surface Roughness Effects on Discharge Coeffficint of Broad- crested Weir. Research Journal of Applied Sciences, Engineering and Technology 2014; 7(24): 5227- 5233.
• Zachoval Z., Kneblova M, Rousar L, Rumann J, Sulc J. Discharge Coefficient of a Rectangular Sharp-Edged Broad-Crested Weir. Journal of Hydrology and Hydromechanics 2014; 62(2): 87-100.
• Madadi MR., Dalir AH, Farsadizadeh D. Investigation of Flow Characteristics above Trapezoidal Broad-Crested Weirs. Flow Measurement and Instrumentation 2014; 38: 139-148.
• Badr K, Mowla D. Development of Rectangular Broad-Crested Weirs for Flow Characteristics and Discharge Measurement. KSCE Journal of Civil Engineering 2015; 19(1): 136-141.