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cee4324-5984_lecture19

cee4324-5984_lecture19 - Glenn E Moglen Department of...

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Unformatted text preview: Glenn E. Moglen Department of Civil & Environmental Engineering Virginia Tech Drowned Jumps and Other Surface Water Profiles CEE 4324/5984 –Open Channel Flow – Lecture 19 Questions from Lecture 18? Surface Water Profiles Review: General “Recipe” Review sluice gate/jump configuration from Example 25. Turn to “trickier” sluice gate examples (Rajan’s question) Reminder: Exam 2 will be Tuesday, November 8 (two weeks from today). Exam will cover through early material on Surface Water Profiles. Today’s Agenda: Surface Water Profiles: General Recipe for Solution 1. Calculate normal depth ( y ) and critical depth ( y c ) to determine if reach is mild, critical, or steep 2. Other useful depths: • Conjugate depth to y ( y conj ) • Alternate depth to gate opening (if sluice gate is present) 1. Identify features in the reach that will affect depth (e.g. gate, step, constriction, change in channel characteristics, boundary conditions, hydraulic jump) 2. Apply energy, momentum, and continuity principles to determine depths at key locations within the reach. Surface Water Profiles: General Recipe for Solution (continued) 5. Where flow is subcritical , work upstream from known depths (the flow will tend towards normal depth). 6. Where flow is supercritical , work downstream from known depths. 7. Use “building block” profiles (see next slide) to connect between known depths: • M 1 , M 2 , M 3 : • S 1 , S 2 , S 3 : • C 1 , C 3 : • H 2 , H 3 : Surface Water Profiles: “Building Block” Profiles 8. For each profile, note that it has several key properties: a. Its letter designation ( M , S , C , H, A ) depends on y relative to y c . b. The profile resides entirely in a particular depth range relative to y and y c ....
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cee4324-5984_lecture19 - Glenn E Moglen Department of...

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