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cee4324-5984_lecture22

# cee4324-5984_lecture22 - CEE 4324/5984 Open Channel Flow...

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Glenn E. Moglen Department of Civil & Environmental Engineering Virginia Tech Surface Water Profiles from Steps, Constrictions, and Shifts in Normal Depth CEE 4324/5984 –Open Channel Flow – Lecture 22

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Questions from Lecture 21? Exam 2 comments Surface Water Profiles Review: General “Recipe” Closure: composite profiles on a steep reach Quick Review: Step on a Mild Reach Example: Profiles from Constriction Profiles from a Change in Normal Depth I am in Blacksburg next Tuesday-Thursday (November 15-17). If you would like to meet with me, please let me know. Today’s Agenda:
Average (mean): 81.7 Range: 66-100 Comments: Problems 2 and 3 were re-visits of Homework 7 (problems 3 and 2, respectively). 60% of exam value in these two problems. Problems 1 and 4 emphasized concepts. Exam 2 Comments

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Conjugate Curve Concept Figure from Henderson (1966).
Composite Profiles on a Steep Reach Q = 100 ft 3 /s b = 10 ft n = 0.011 S 0 = 0.01 y c = 1.46 ft y 0 = 0.839 ft Distance (ft) Elevation (ft) gate x (ft) jump x (ft) S 1 (ft) S 2 (ft) y 1 (ft) y 2 (ft) 550 492.8 57.2 492.8 0.839 2.333 500 442.3 57.7 442.3 0.842 2.328 300 238.7 61.3 238.7 0.865 2.281 200 131.8 68.2 131.8 0.914 2.190 150 73.3 76.7 73.3 0.982 2.071

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Surface Water Profiles – Composite Profile on a Steep Reach It is difficult to see from the figure, but the S 1 curve increases in length and the S 2 curve decreases in length as the overall distance from the head of the steep overfall decreases.
Example 30: Step on a Mild Reach Use conditions for Example 22d: q = 10 ft 2 /s, y 0 = 2.16 ft Step height is 1.04 ft

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cee4324-5984_lecture22 - CEE 4324/5984 Open Channel Flow...

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