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:
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
Exam 2 Comments – Problem 2

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Exam 2 Comments – Problem 3
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
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?
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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