cee4324-5984_lecture23

cee4324-5984_lecture23 - CEE 4324/5984 Open Channel Flow...

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Glenn E. Moglen Department of Civil & Environmental Engineering Virginia Tech Exam 2 Review, Profiles from Reach Transitions, and Begin Quantitative Surface Water Profiles CEE 4324/5984 –Open Channel Flow – Lecture 23
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Questions from Lecture 22? Review Exam 2 Finish Qualitative Surface Water Profiles Reach transition: Review Milder to Steeper profiles Reach transition: Steep to Mild – where is the hydraulic jump? Begin Quantitative Surface Water Profiles Standard Step Method Today’s Agenda:
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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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Exam 2 Comments – Problem 1
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Exam 2 Comments – Problem 2
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Exam 2 Comments – Problem 3
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Exam 2 Comments – Problem 4
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Example 32: Transition from a Mild to Steep Reach Quantitative values not provided – just focus on the concept. Flow enters and exits at normal depth. What happens in between? Mild reach Steep reach
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Example 32: Take-away facts Unlike previous examples, because normal depth changes from upstream to downstream, energy is not conserved through system.
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Example 33: Transition from a Steep to Steeper Reach Steep reach Steeper reach Flow enters and exits at normal depth. What happens in between?
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Because flow is everywhere supercritical, “information” about the steeper reach isn’t “felt” by the flow until it reaches that steeper reach. Upstream “steep” reach is everywhere
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cee4324-5984_lecture23 - CEE 4324/5984 Open Channel Flow...

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