Results 111 to 120 of about 1,336 (145)

DISCHARGE PREDICTION AT FREE OVERFALLS

ISH Journal of Hydraulic Engineering, 2002
(2002). DISCHARGE PREDICTION AT FREE OVERFALLS. ISH Journal of Hydraulic Engineering: Vol. 8, No. 1, pp. 69-71.
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Roughness Effects on Rectangular Free Overfall

Journal of the Hydraulics Division, 1976
For a rectangular free overfall, the end depth ratio (EDR) has been well connected with the main parameters using dimensional analysis. Using experimental results on three different roughnesses, it has been found that the EDR can be predicted from the curve Delleur, et al., for smooth channels, if the relative roughness k s /ydac (in which k s is the ...
Nallamuthu Rajaratnam, Durfakula Muralidhar, Spyridon Beltaos   +2 more
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Hydraulics of Plane Free Overfall

Journal of Hydraulic Engineering, 1983
The plane, free overfall is treated by using extended energy and momentum equations taking account of the streamline inclination and curvature. The end‐depth‐ratio is estimated by momentum considerations in the brink and the upstream sections. Distinction is made between pressure head and flow depth which coincide only for parallel, horizontal ...
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Estimating Trajectory of Free Overfall Nappe

Journal of Hydraulic Engineering, 1999
The upper surface profile of a rectangular free overfall is modeled using the free-fall parabolic equation. Empirical and semiempirical relationships for the unknown quantities in this equation are presented. It was found that the resulting simple and straightforward method adequately predicts the position of the upper nappe surface. A relationship for
Alastair C. Davis, Richard P. Jacob, Brian G. S. Ellett   +2 more
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Numerical Modeling of Free Overfall

Journal of Hydraulic Engineering, 2005
Free overfall is treated by using two-dimensional steady potential flow theory. Based on the theory of the boundary value problem of analytical function and the substitution of variables we derive the boundary integral equations in the physical plane for solving the free overfall in a rectangular channel. A numerical iterative method has been developed
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Flow Measurement with Rectangular Free Overfall

Journal of Irrigation and Drainage Engineering, 1992
Previous experimental works provide different values of the ratio between the end depth and the critical depth. Differences depend on the crosssection shape of the channel, the roughness of the channel, and the characteristics of the nappe (confined or free on the sides).
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Characteristics of free overfall for supercritical flows

Canadian Journal of Civil Engineering, 2007
The characteristics of supercritical flow at a vertical drop in a rectangular channel are studied experimentally to obtain information that would be valuable to designers of hydraulic structures. The relationship between the ratio of brink depth to the depth of upstream supercritical flow (i.e., end-depth ratio) and the Froude number is determined ...
Nuray Denli Tokyay, Dilek Yildiz
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Local scour due to free overfall jet

Proceedings of the Institution of Civil Engineers - Water Management, 2006
A study was conducted to determine how the tailwater depth beneath a free-falling water jet affects the dimensions of local scour. Available data on scouring in uniform bed material due to circular and rectangular outflow jets were compiled and analysed. It was found that the scour hole geometry (i.e.
M. Ghodsian, B. Melville, D. Tajkarimi
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Direct solution for discharge in circular free overfall

Journal of Hydrology, 2012
Summary Free overfall at the end of a circular channel is simulated as sharp-crested weir with zero height to get end-depth-discharge relationship. A closed-form equation for discharge in terms of end depth for subcritical flows is proposed and verified with the experimental data.
Z. Ahmad, H.Md. Azamathulla
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Numerical Simulation of 3D Free Overfall Flows

2012
3D Free overfall flows by the two-phase least-squares finite element method (LSFEM) have been presented. The dynamic and kinematic boundary conditions of free surface are described in an Eulerian coordinate system. The governing 3D Navier-Stokes equations in association with the color function are solved by element-by-element scheme. In this simulation,
Jyh-Haw Tang, Ming-Kuan Sun
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