CVG 3116 Lecture Notes - Lecture 7: Froude Number, Hydraulic Jump, Sequent

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Tutorial 4 solutions: a trapezoidal channel has a bottom width of b=1. 83m and side slopes of m=2 (1v:2h) and it carries a discharge of q=8. 21cms. Suppose the channel is nearly horizontal except that there is a smooth, short upward step in the channel bottom of z=0. 69m. The energy loss due to this step is still negligible. The depth before the step (section a) is 1. 62m. Determine the flow depth over the step (section. Solutions: find specific energy at a (ea) Find minimum specific energy at b (eb(min)) to prevent choking. We cannot solve for ycb explicitly: by trial-error or using solver (excel). Since there is choking, we need to determine how the flow will react to it. The minimum specific energy at b is 1. 22m. Thus, the specific energy needed at a is: The adjusted water depth at a is then: Again, we cannot solve for ya_ajd explicitly: by trial-error or using solver (excel).

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