cee4324-5984_lecture15

cee4324-5984_lecture15 - Glenn E. Moglen Department of...

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Unformatted text preview: Glenn E. Moglen Department of Civil & Environmental Engineering Virginia Tech Flow Resistance (continued) CEE 4324/5984 Open Channel Flow Lecture 15 Questions from Lecture 14? Reminder: Please read Chaudhry: 4-1 4-3 Flow Resistance Shear Stress in an open channel Flow resistance equations Chzy Equation Manning Equation Normal Depth Definition Examples Calculator Tools Todays Agenda: Flow Resistance Definition Sketch Datum y z v 2 /2g T.E.L H.G.L 1 S f 1 S Non-Uniform Flow: S f relative to S S > S f S < S f T.E.L. T.E.L. 1 S 1 S Gaining energy downstream Losing energy downstream Uniform Flow: Non-Uniform Flow: <<derivation to be done on whiteboard>> Shear Stress in an Open Channel RS = f RS = Chzy Equation Chzy (1768) based on water supply canals in Paris Equation: <<derivation to be done on whiteboard>> RS C v = Manning Equation Manning (1891) various stories as to its origin Take Chzy C : Then, substituting in Chzys equation: n R C 6 1 = 2 1 3 2 S R n C v M = C M = 1 : metric units C M = 1.486 : English units Representative Mannings n values: For more see link at class web page Normal Depth...
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This note was uploaded on 12/24/2011 for the course CEE 4324 taught by Professor Moglen during the Fall '11 term at Virginia Tech.

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cee4324-5984_lecture15 - Glenn E. Moglen Department of...

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