Hydraulic Engineering
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1 PDHonline Course H146 (4 PDH) Hydraulic Engineering Instructor: Mohamed Elsanabary, Ph.D., Prov. Lic. Engineering PDH Online PDH Center 5272 Meadow Estates Drive Fairfax, VA Phone & Fax: An Approved Continuing Education Provider
2 Hydraulic Engineering Session 3 By Dr. Mohamed Helmy Elsanabary Mohamed Elsanabary, Ph.D. Page 2 of 21
3 Session Goals Understand thegradually varied flow (GVF); Understand the surface slope; Understand dthe bdl bed slope; Understand the water surface profiles; Calculate the water surface curve length. Mohamed Elsanabary, Ph.D. Page 3 of 21
4 Gradually Varied Flow (GVF) Mohamed Elsanabary, Ph.D. Page 4 of 21
5 Gradually Varied Flow (GVF) Energy equation for nonuniform, steady flow with basic assumption that the change in energy with distance is equal to the friction loses T=dA/dy Mohamed Elsanabary, Ph.D. Page 5 of 21
6 Gradually Varied Flow (GVF) By dividing the equation by dx: Mohamed Elsanabary, Ph.D. Page 6 of 21
7 Gradually Varied Flow (GVF) Therefore, the governing equation for gradually varied flow: Where the variation of depth y with the channel distance x is shown to be a function of bed slope S 0, Friction Slope, S f and the flow Froude number F r. Mohamed Elsanabary, Ph.D. Page 7 of 21
8 Gradually Varied Flow (GVF) Gives change of water depth with ihdistance along channel For GVF calculation please note: S o and S f are positive when sloping down in direction of flow y is measured from channel bottom dy/dx =0 means water depth is constant y = y n is when S o =S f Mohamed Elsanabary, Ph.D. Page 8 of 21
9 Water Surface Profiles Mohamed Elsanabary, Ph.D. Page 9 of 21
10 Water Surface Profiles When there is a change in cross section or slope or an obstruction to the flow, the qualitative analysis of the flow profile depends on locating the control points, determining the type of water surface profile upstream and downstream of the control points, and then sketching these profiles. It must be remembered that when flow is supercritical (F r >1), the control depth is upstream and the water surface profile analysis proceeds in the downstream direction. When flow is subcritical (F r < 1), the control depth is downstream and the computations must proceed upstream. Water surface profiles that result from a change in slope of the bed are shown in the next slide: Mohamed Elsanabary, Ph.D. Page 10 of 21
11 Water Surface Profiles Mohamed Elsanabary, Ph.D. Page 11 of 21
12 Water Surface Profiles Example: A 16 ft wide, rectangular channel goes from a very steep grade to a mild slope. The design discharge is 875 ft3/s and the normal depth and velocity on the steep slope were calculated to be 1.0 ft and 49 ft/s, respectively. On the mild slope, the normal depth and velocity were calculated to be 9.71 ft and ft/s, respectively. Determine the type of flow occurring in both channels. If a hydraulic jump occurs, evaluate the depth downstream of the hydraulic jump, the location of the jump, andthe watersurface profile classification. Mohamed Elsanabary, Ph.D. Page 12 of 21
13 Water Surface Profiles Mohamed Elsanabary, Ph.D. Page 13 of 21
14 Water Surface Profiles Mohamed Elsanabary, Ph.D. Page 14 of 21
15 Water Surface Profiles Mohamed Elsanabary, Ph.D. Page 15 of 21
16 Computation of GVF Mohamed Elsanabary, Ph.D. Page 16 of 21
17 Computation of GVF Mohamed Elsanabary, Ph.D. Page 17 of 21
18 Computation of GVF Mohamed Elsanabary, Ph.D. Page 18 of 21
19 Computation of GVF Mohamed Elsanabary, Ph.D. Page 19 of 21
20 Assignment Mohamed Elsanabary, Ph.D. Page 20 of 21
21 Assignment Mohamed Elsanabary, Ph.D. Page 21 of 21
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