Closure to “End Depth–Discharge Relation at Free Overfall of Trapezoidal Channels” by A. S. Ramamurthy, Chao Zhai, and Junying Qu

2006 ◽  
Vol 132 (3) ◽  
pp. 307-307
Author(s):  
A. S. Ramamurthy ◽  
Chao Zhai ◽  
Junying Qu
Keyword(s):  
End Depth ◽  
Free Overfall

End Depth–Discharge Relation at Free Overfall of Trapezoidal Channels

2004 ◽  
Vol 130 (5) ◽  
pp. 432-436 ◽  
Author(s):  
A. S. Ramamurthy ◽  
Chao Zhai ◽  
Junying Qu
Keyword(s):  
End Depth ◽  
Free Overfall

Characteristics of free overfall for supercritical flows

2007 ◽  
Vol 34 (2) ◽  
pp. 162-169 ◽  
Author(s):  
Nuray Denli Tokyay ◽  
Dilek Yildiz
Keyword(s):  
Rectangular Channel ◽  
Free Fall ◽  
Horizontal Distance ◽  
Supercritical Flow ◽  
Downstream Flow ◽  
Supercritical Flows ◽  
The Relationship ◽  
End Depth ◽  
Brink Depth ◽  
Free Overfall

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. Downstream from the vertical drop, the physical characteristics of the falling jet are examined, such as the height of the standing water behind the jet, the maximum horizontal distance of the jet hitting the floor downstream, the height and length of the splashing water, and the horizontal distance where the downstream flow gains uniformity. The energy loss between the drop and stable downstream flow is also studied.Key words: supercritical flow, brink depth, free fall.

scholarly journals End-depth in inverted semicircular channels: experimental and theoretical studies

2004 ◽  
Vol 35 (1) ◽  
pp. 73-79 ◽  
Author(s):  
Subhasish Dey ◽  
D. Nagesh Kumar ◽  
D. Ram Singh
Keyword(s):  
Experimental Data ◽  
Energy Equation ◽  
Pressure Coefficient ◽  
Diameter Ratio ◽  
Theoretical Studies ◽  
Critical Depth ◽  
Simple Method ◽  
Experimental And Theoretical Studies ◽  
End Depth ◽  
Free Overfall

The flow upstream of a free overfall from smooth inverted semicircular channels is theoretically analysed to compute the end-depth ratio (EDR), applying an energy equation based on the Boussinesq assumption. This approach eliminates the need for an experimentally determined pressure coefficient. Experiments were conducted with horizontal channel conditions. The EDR related to the critical depth, which occurs upstream from the end section, is found to be around 0.695 for a critical depth-diameter ratio up to 0.40. A simple method is presented to estimate the discharge from a known end-depth. The theoretical model corresponds closely with the experimental data.

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