Mastering Hydraulic Routing in Rivers: HEC-RAS Manual Insights
Dive deep into hydraulic routing in rivers with the HEC-RAS Manual, exploring topics like specific energy, critical flow, flood inundation, floodplain delineation, and steady flow solutions. Understand concepts such as flow conveyance, energy head loss, velocity coefficients, and solving steady flow equations. Learn about one-dimensional flow computations, reach lengths, and practical flow computations for different reaches. Enhance your expertise in river hydraulics with detailed visual aids and step-by-step guidance.
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Hydraulic Routing in Rivers Reading: HEC-RAS Manual pp. 2-1 to 2-15 Stormwater Conveyance Modeling and Design, Sec 7.4 on Specific Energy and Critical Flow http://www.hec.usace.army.mil/software/hec-ras/documentation/HEC-RAS_4.1_Reference_Manual.pdf
One-Dimensional Flow Computations Cross-section Channel centerline and banklines Right Overbank Left Overbank
Flow Conveyance, K Left Overbank Channel Right Overbank ? =1.49 ? =1.49 ??2/3 1/2 ??2/3?? ? ? ?5/3 ?2/3 ?? ? =1.49 1/2 ?? ? = ??? ?
Reach Lengths (1) Floodplain Lch Rob Lob Floodplain (2) Left to Right looking downstream
Solving Steady Flow Equations Q is known throughout reach 1. All conditions at (1) are known, Q is known 2. Select h2 3. compute Y2, V2, K2, Sf, he 4. Using energy equation (A), compute h2 5. Compare new h2 with the value assumed in Step 2, and repeat until convergence occurs (A) h2 h1 (2) (1) 2 ? ? ??=
Flow Computations Reach 3 Reach 2 Start at the downstream end (for subcritical flow) Treat each reach separately Compute h upstream, one cross- section at a time Use computed h values to delineate the floodplain Reach 1
