0-6549 Hydraulic Performance of Staggered-Barrel Culverts for Stream Crossings

7 Sep 2011: Progress Meeting

0-6549 Hydraulic Performance of Staggered-Barrel Culverts for Stream

Crossings

Agenda

• Introductions

• By-Task Progress

• Problems

• Miscellaneous

• Lab Visit

Introductions

• Researchers:

• Project Management Committee:

• Visitors:

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.

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

Task 1: Literature Review

• TM1 submitted.– Copies on server

• Database(s) assembled.– QA/QC complete.

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.

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.

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)

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.

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.

Task 4: Data Analysis.

• 2-D/2-phase computer program (UH researchers) to interpret experiments.

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

1D Morphodynamic Model

Purpose of modelDynamic modeling of culvert reach that

accounts for deposition/erosion (data analysis)

Upscaling of lab model results (data analysis)

1D Morphodynamic Model

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

1D Morphodynamic Model

EquationsContinuity:

Saint Venant:

Exner:

Methods

MacCormack Finite Difference

TVD

Modification to sources terms

1D Morphodynamic Model

Transcritical flow

1D Morphodynamic Model

Bed aggradation due to sediment overloading

1D Morphodynamic Model

Bed degrading due to base level drop

1D Morphodynamic Model

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.

Real County LWC still looks good

looking downstream

upstream

downstream

Task 4: Data Analysis.

• FasTMECH CFD computer program (TTU) to extrapolate to larger scales.

Task 4: Data Analysis.

• CAP-R (Culvert Analysis Program – R) to provide design and performance guidance.

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)

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)

Miscellaneous

• Present provisional results at ASCE/EWRI in ABQ next May.

Laboratory Tour

• Visit laboratory and see demonstration of how experiments were conducted.• Underwater video, ADV• Solids motion