Transcription of 3.2 Topic 8: Open Channel Flow - University of Texas at Austin
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3.2 Topic 8: Open Channel Flow - University of Texas at Austin
1 Course Number: CE 365 KCourse Title: Hydraulic Engineering Design Course Instructor: Charbeneau Subject: open Channel Hydraulics topics Covered:8. open Channel Flow and Manning Equation9. Energy, Specific Energy, and Gradually Varied Flow10. Momentum (Hydraulic Jump)11. Computation: Direct Step Method and Channel Transitions12. Application of HEC-RAS13. Design of Stable 8: open Channel FlowGeomorphology of Natural Channels:Geomorphology of natural channels concerns their shape and structure. Natural channels are of irregular shape, varying from approximately parabolic to approximately trapezoidal (Chow, 1959).Trapezoidal Geometry Characteristics Depth, y Area, A Wetted perimeter, P Top width, THydraulic Radius, Rh= Area / Wetted perimeterHydraulic Depth, Dh= Area / Top ChannelIf 0 < (4 a y)1/2< 1 Example #12: Parabolic ChannelA grassy swale with parabolic cross-section shape has top width T = 6 m when depth y = m whi
14 Gradually Varied Flow Profiles Physical laws governing the head variation in open channel flow 1) Gravity (So) is the driving force for flow 2) If So = Sf then dE/dx = 0 and flow is uniform (normal depth) 3) Gravity (So) is balanced by friction resistance (Sf) and longitudinal adjustment in specific energy (dE/dx)
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