Transcription of 3.2 Topic 8: Open Channel Flow - University of Texas at Austin
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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 while carrying stormwater runoff.
13. Design of Stable Channels 3.1 Topic 8: Open Channel Flow Geomorphology of Natural Channels: Geomorphology of natural c hannels concerns their shape and structure. Natural channels are of irregular shape, varying from approximately parabolic to approx imately trapezoidal (Chow, 1959). Trapezoidal fit 3.2 y
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