Discharge Coefficient of Rectangular Side Weirs

Singh, R. P.; Manivannan, None D.; Satyanarayana, T. V.

doi:10.1061/(asce)0733-9437(1994)120:4(814)

Cited by 154 publications

(96 citation statements)

References 3 publications

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“…The present study dealt mainly with the application of the energy principle in the analysis of flow over side weirs. The concept of constant specific energy (De Marchi, 1934) is quite often adopted in studying the flow characteristics of side weirs (Emiroglu et al, 2010a, b;Singh et al, 1994;Hager, 1987;Subramanya and Awasthy, 1972). De Marchi (1934) was one of the first researchers to provide equations for flow over side weirs.…”

Section: Discharge Coefficient Functionmentioning

confidence: 99%

“…Borghei et al (1999) discussed the application of spatially varied flow in sharp-crested rectangular side weirs. The hydraulic behaviour and discharge coefficient of side weirs for the different types of weirs, main channels and flow conditions have been studied by many researchers, for example, Nandesamoorthy and Thomson (1972), Yu-Tech (1972), Cheong (1991), andSingh et al (1994). Ghodsian (2003) studied supercritical flow in rectangular side weirs.…”

Section: Introductionmentioning

confidence: 99%

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Discharge coefficient of semi-circular labyrinth side weir in subcritical flow

Khalili¹,

Honar²

2017

WSA

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Side weirs are flow diversion or intake devices that are widely used in irrigation and drainage networks and urban sewage systems. Labyrinth weirs have a proven hydraulic advantage due to their increased discharge rate at the same head for a given design condition. A labyrinth weir is defined as a weir crest that is not straight in plan-form. The increased sill length provided by labyrinth weirs effectively reduces upstream head to the particular discharge. In this study, a comprehensive laboratory study was conducted in a physical model of a semi-circular labyrinth side weir and the model is evaluated for three heights and three radii. In this particular study, the hydraulic effects of this shape of side weir in increasing discharge capacity was investigated. The discharge coefficient of semi-circular labyrinth side weirs was determined and the results were analysed to find the influence of the dimensionless parameters of weir height (w/b), weir length (r/b), nape height ((y 1 −w)/r), and upstream Froude number (Fr 1 ) on discharge coefficient (C d ), based on the experimental conditions and previous studies. It was found that the discharge coefficient of the semi-circular labyrinth side weir gives a relatively high discharge coefficient value compared to other types of classic side weir positioned on a straight channel. Additionally, reliable equations for calculating the discharge coefficient (C d ) of semi-circular labyrinth side weirs are proposed. According to the proposed equation, C d depends on dimensionless parameters, which are the ratios of r/b, r/w, (y 1 −w)/r, (y 2 −w)/r and Fr 1 .

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Section: Discharge Coefficient Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Discharge coefficient of semi-circular labyrinth side weir in subcritical flow

Khalili¹,

Honar²

2017

WSA

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“…For side weirs this overflow discharge is reduced by a correction factor due to weir obliqueness (Bos, 1989;Honar and Javan, 2007). In the second approach the discharge coefficient is derived from flow conditions in the channel for the specific type of lateral weir (Aghayari et al, 2009;Borghei et al, 1999;Frazer, 1957;Hager, 1987;Honar and Javan, 2007;Ranga Raju et al, 1979;Rosier, 2007;Singh et al, 1994;Subramanya and Awasthy, 1972;Swamee et al, 1994). This correction factor is usually introduced for a prismatic channel and a specific weir type and arrangement.…”

Section: Literature Reviewmentioning

confidence: 99%

Flow characteristics at trapezoidal broad-crested side weir

Říha

Zachoval

2015

Journal of Hydrology and Hydromechanics

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Broad-crested side weirs have been the subject of numerous hydraulic studies; however, the flow field at the weir crest and in front of the weir in the approach channel still has not been fully described. Also, the discharge coefficient of broad-crested side weirs, whether slightly inclined towards the stream or lateral, still has yet to be clearly determined. Experimental research was carried out to describe the flow characteristics at low Froude numbers in the approach flow channel for various combinations of in-and overflow discharges. Three side weir types with different oblique angles were studied. Their flow characteristics and discharge coefficients were analyzed and assessed based on the results obtained from extensive measurements performed on a hydraulic model. The empirical relation between the angle of side weir obliqueness, Froude numbers in the up-and downstream channels, and the coefficient of obliqueness was derived.

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“…Various studies have been done to find the discharge coefficient of rectangular side weirs (Ackers 1957;Ghodsian 2003;Muslu 2001;Muslu et al 2003;Nadesamoorthy and Thomson 1972;Ranga Raju et al 1979;Singh et al 1994;Swamee et al 1994;Yu-Tech 1972;Yuksel 2004). Increasing the discharge capacity of side weirs needs to increase the length of them.…”

Section: Introductionmentioning

confidence: 99%

Optimum Support Vector Regression for Discharge Coefficient of Modified Side Weirs Prediction

Zaji

Bonakdari

2017

INAE Lett

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Designing procedure of economical and safe side weirs that are used in various hydraulic structures such as intakes and deviation systems, essentially needs the ability to predict the side weirs' discharge capacity accurately. In this paper, the discharge coefficient of a modified labyrinth side weir was modeled by employing the support vector regression (SVR) method. To find the optimum SVR scenario, eight different kernel functions and six different input combinations were investigated. The accuracy of the SVR models were compared with two nonlinear regression equations from other published studies. The results showed that the SVR model with Polynomial Kernel Function and w=L; Fr 1 = sin h 0 ; w=Y 1 and w sin h 0 =Y 1 as input parameters performs better than other models in predicting the discharge coefficient. Where w, L, h 0 , and Y 1 are the height of crest, weir length, oblique side-weir included angle, and upstream flow depth, respectively. Also, the results showed that the SVR model with mean square error (RMSE) of 0.050 performs much better than the two other nonlinear regression published equations with RMSE of 0.121 and 0.4270, respectively.

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Discharge Coefficient of Rectangular Side Weirs

Cited by 154 publications

References 3 publications

Discharge coefficient of semi-circular labyrinth side weir in subcritical flow

Discharge coefficient of semi-circular labyrinth side weir in subcritical flow

Flow characteristics at trapezoidal broad-crested side weir

Optimum Support Vector Regression for Discharge Coefficient of Modified Side Weirs Prediction

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