Transportation Research Board 2002 Annual Meeting Presentations from Workshop on Plan of Action for Scour Critical Bridges

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Slide 1

WORKSHOP ON PLAN OF
ACTION FOR SCOUR CRITICAL BRIDGES

Transportation Research Board
2002 Annual Meeting

Sponsored By
A2A03 Committee on Hydrology,
Hydraulics and Water Quality

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HEC-23 MATRIX FOR SELECTING COUNTERMEASURES

P.F. Lagasse, Ph.D., P.E.
Transportation Research Board
2002 Annual Meeting

Sponsored By
A2A03 Committee on Hydrology,
Hydraulics and Water Quality

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PURPOSE

• Identify stream instability and scour countermeasures implemented by various SHA's
• Develop a matrix which summarizes countermeasure application throughout the US.
• Provide design guidelines for selected countermeasures

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THE COUNTERMEASURES MATRIX

• COUNTERMEASURE GROUPS
• FUNCTIONAL APPLICATIONS
• SUITABLE RIVER ENVIRONMENT
• MAINTENANCE
• INSTALLATION EXPERIENCE BY STATE
• DESIGN GUIDELINE REFERENCES

COUNTERMEASURE GROUPS

GROUP 1 Hydraulic Countermeasures

• Group 1.A. River Training Structures
• Group 1.B. Armoring Countermeasures

GROUP 2 Structural Countermeasures

• Foundation Strengthening
• Pier Geometry Modification

GROUP 3 Monitoring

• Fixed Instrumentation
• Portable Instrumentation
• Visual Monitoring

FUNCTIONAL APPLICATIONS

• Well Suited / Primary Use
  • Possible Application / Secondary Use
  
  
• Unsuitable / Rarely Used
• N/A Not Applicable

SUITABLE RIVER ENVIRONMENT

• River Type
• Stream Size (Width)
• Bend Radius
• Flow Velocity
• Bed Material
• Ice / Debris Load
• Bank Condition
• Floodplain (Width)

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HEC-23 DESIGN GUIDELINES

• Design Guideline 1 - Bendway Weirs/ Stream Barbs
• Design Guideline 2 - Soil Cement
• Design Guideline 3 - Wire Enclosed Riprap Mattress
• Design Guideline 4 - Articulated Concrete Blocks
• Design Guideline 5 - Grout Filled Mattresses
• Design Guideline 6 - Concrete Armor Units
• Design Guideline 7 - Grout/Cement Filled Bags
• Design Guideline 8 - Rock Riprap at Abutments & Piers
• Design Guideline 9 - Spurs
• Design Guideline 10 - Guide Banks
• Design Guideline 11 - Check Dams/Drop Structures
• Design Guideline 12 - Revetments

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DESIGN GUIDELINE 1

Bendway weirs / Stream barbs

• Sources
  • Colorado Department of Transportation
  • Washington State Department of Transportation
  • NRCS
  • U.S. Army Corps of Engineers
  
  
• Application
  • Bankline protection and flow alignment in meandering channel bends
  
  

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DESIGN GUIDELINE 2

Soil Cement

• Sources
  • Portland Cement Association
  • Pima County Department of Transportation
  • Maricopa County, Arizona
  
  
• Application
  • Revetment for banklines and sloping abutments, drop structures and bed armor
  
  

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DESIGN GUIDELINE 3

Wire Enclosed Riprap Mattress

• Sources
  • New Mexico State Highway and Transportation Department
  
  
• Application
  • Revetment for banklines, guidebanks, and sloping abutments
  
  

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DESIGN GUIDELINE 4

Articulated Concrete Block System

• Sources
  • Hydro Review and Hydraulic Engineering '93
  • Maine Department of Transportation
  • Minnesota Department of Transportation
  
  
• Application 1
  • Bankline and abutment revetment and bed armor
  
  
• Application 2
  • Pier scour protection
  
  

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DESIGN GUIDELINE 5

Articulating Grout Filled Mattress

• Sources
  • Oregon Department of Transportation
  • Arizona Department of Transportation
  
  
• Application
  • Bankline and abutment revetment and bed armor
  
  

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DESIGN GUIDELINE 6

Concrete Armor Units

• Sources
  • Pennsylvania Department of Transportation
    and Tested at Colorado State University
  • A-Jacks Testing Manual (CSU)
  
  
• Application
  • Pier scour and abutment scour protection
  
  

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DESIGN GUIDELINE 7

Grout / Cement Filled Bags

• Sources
  • Maryland State Highway Administration
  • Maine Department of Transportation
  
  
• Application
  • Protection of undermined areas at piers and
    abutments and bed armor
  
  

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