The Method of Decision on the Hydraulic Dimensions of Intake Channel for the Bar Screen Compound Type Torrent Intake

Abstract

The method of decision on the hydraulic dimensions of intake channel for the bar screen type torrent intake has been based on the side channel spillway of the fill dam. And the depth in the side channel spillway has been calculated by application of the momentum equation.
However, speaking of the bar screen compound type torrent intake which has large installation angle of the bar screen such as 45°-50°, the inflow discharge through the bar screen forms secondary flow in the intake channel, then its velocity decreases and the cross-section becomes large. It goes without saying that secondary flow is formed in the side channel spillway, but in case of intake channel, as height of drop is high and width of intake channel is small, the effect of secondary flow is large.
In this paper, the authors make a proposal on the method of decision on the hydraulic dimensions of intake channel adding velocity head to uniform flow depth, and we clarified above method through both of the hydraulic model test and existing works.