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7 Sep 2011: Progress Meeting
0-6549 Hydraulic Performance of Staggered-Barrel Culverts for Stream
Crossings
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Agenda
• Introductions
• By-Task Progress
• Problems
• Miscellaneous
• Lab Visit
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Introductions
• Researchers:
• Project Management Committee:
• Visitors:
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Project Background
• Develop knowledge to address the issue of solids accommodation in Texas Department of Transportation low-water crossing structures (not bridges).
• To develop design guidelines to assist in building multiple barrel systems that mimic the necessary stream behavior to facilitate solids migration.
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Progress by Tasks
• Brief by-task report.– Task 1: Literature Review– Task 2: Screening Tools– Task 3: Quantitative Modeling– Task 4: Data Analysis– Task 5: Reporting
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Task 1: Literature Review
• TM1 submitted.– Copies on server
• Database(s) assembled.– QA/QC complete.
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Task 2: Screening tool(s).
• Database dependent– QA/QC on-going as just reported– Prototype screening tool exists
– USGS is programming for team deployment.– Prototype runs OK on PC, will not run on Mac
(but should)
– TM2 was due July 2011– PD reminded RS about TM2. TM2 to be
completed before end of CY 2011, probably sooner.
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Task 2: Screening tool(s).
• Database dependent– QA/QC on-going as just reported– Prototype screening tool exists
– USGS is programming for team deployment.– http://tx.cr.usgs.gov/jvrabel/WATER_index.html
#guiTaskItem2_demo– TM2 was due July 2011
– PD reminded RS about TM2. TM2 to be completed before end of CY 2011, probably sooner.
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Task 3: Quantitative modeling.
• Laboratory system functional.– Have solids in-place and will demonstrate
today.
– Experimental program ended August 31– Large fraction of planned experiments
were conducted.– Data interpretation FY12 (CY11-12)
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Task 3: Quantitative modeling.
• Certain experiments were omitted• Sand – entirely omitted, could not keep
sand in model.
• Gravel sizes changed to reflect mobility from first few months of experimental program.
• Slopes different to fit actual model capabilities.
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Task 4: Data Analysis.
• 2-D/2-phase computer program (UH researchers) to guide experiments.
• FaSTMECH CFD computer program (TTU) to extrapolate to larger scales.
• CAP-R (Culvert Analysis Program – R) to provide design and performance guidance.
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Task 4: Data Analysis.
• 2-D/2-phase computer program (UH researchers) to interpret experiments.
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UH Activities
1D coupled morphodynamics profile modelPeople: Ruosen Qian (MS), Kyle Strom
Database refinement for screening toolPeople: Kyle Strom (Task 2)
HEC-RAS modeling of Real County crossingPeople: Miguel Albuja (UG), Guillo Machado
(UG), Kyle Strom
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1D Morphodynamic Model
Purpose of modelDynamic modeling of culvert reach that
accounts for deposition/erosion (data analysis)
Upscaling of lab model results (data analysis)
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1D Morphodynamic Model
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1D Morphodynamic ModelProgress
Validated modelPure open channel with movable bed and variable
width (transcritical flow)
Open/pressured flow in a circular pipe
Ruosen graduated in August
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1D Morphodynamic Model
EquationsContinuity:
Saint Venant:
Exner:
Methods
MacCormack Finite Difference
TVD
Modification to sources terms
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1D Morphodynamic Model
Transcritical flow
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1D Morphodynamic Model
Bed aggradation due to sediment overloading
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1D Morphodynamic Model
Bed degrading due to base level drop
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1D Morphodynamic Model
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Remaining work
•1D morphodynamic model– Use culvert equations as internal boundary
conditions with dynamic bed equation to capture changes in culvert geometry.
•Screening tool
– Aid TTU and USGS in tool development
•HEC-RAS
– Finish analysis of Real County and a hypothetical case to determine extent to which HEC-RAS can be helpful in analysis.
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Real County LWC still looks good
looking downstream
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upstream
downstream
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Task 4: Data Analysis.
• FasTMECH CFD computer program (TTU) to extrapolate to larger scales.
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Task 4: Data Analysis.
• CAP-R (Culvert Analysis Program – R) to provide design and performance guidance.
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Task 5: Reporting.
• SAR submitted end of August
• Monthly reports on server; Project start to June 2011 should be there.
• TM1 submitted
• TM2 in-progress
• TM3, TM4 pending.
• Final Report FY12 (Draft August 2012)
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Problems Encountered
• Took longer to start experiments than anticipated.– Weir calibration
– Leaks, computers failing, etc.
• Boundary conditions in 1D not continuous from free-surface to pressure flow
• Screening Tool• MatLab compiler not producing architecture
independent application)
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Miscellaneous
• Present provisional results at ASCE/EWRI in ABQ next May.
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Laboratory Tour
• Visit laboratory and see demonstration of how experiments were conducted.• Underwater video, ADV• Solids motion