Skip to contentUnited States Department of Transportation - Federal Highway AdministrationFHWA HomeFeedback

Hydraulics Engineering

 

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


PowerPoint Version (11.3 mb)

PowerPoint files can be viewed with the PowerPoint Viewer

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

Slide 2

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

Slide 3

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

Slide 4 - 9

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)

Slide 10

Photo: permeable sliding synthetic mesh

Slide 11

Photo: Spurs

Slide 12 - 13

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

Slide 14

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


Slide 15

Photo: Bendway weirs at low flow

Slide 16

Photo: Bendway weirs at high flow

Slide 17

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


Slide 18

Photo: soil cement installation protecting a bank line

Slide 19

DESIGN GUIDELINE 3

Wire Enclosed Riprap Mattress

  • Sources
    • New Mexico State Highway and Transportation Department

  • Application
    • Revetment for banklines, guidebanks, and sloping abutments


Slide 20

Photo: wire enclosed riprap mattress for embankment and abutment protection

Slide 21

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


Slide 22

Photo: articulated concrete block system for bankline and abutment protection

Slide 23

DESIGN GUIDELINE 5

Articulating Grout Filled Mattress

  • Sources
    • Oregon Department of Transportation
    • Arizona Department of Transportation

  • Application
    • Bankline and abutment revetment and bed armor


Slide 24

Photo: articulating grout filled mattress for abutment protection

Slide 25

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


Slide 26

Photo: toskanes armoring units for pier scour protection in the lab

Slide 27

Photo: local scour at piers prior to the installation of an A-Jacks system

Slide 28

Photo: A-Jacks system installed at a bridge for pier scour protection

Slide 29

Photo: close up view of A-Jacks installation at a bridge pier

Slide 30

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


Slide 31

Photo: cement filled bag for abutment scour protection

Return to top

 
Updated: 04/07/2011
 

FHWA
United States Department of Transportation - Federal Highway Administration