Evaluation of Abutment Scour at Maine Bridges

Hundreds of current and future bridges in Maine have been and will be subject to abutment scour. Current methods of estimating the maximum depth of abutment scour are based on laboratory work and generally have not been tested in the field. The abutment scour estimation methods have predicted excessively conservative maximum scour depths in many regions of the country. Determining the best abutment scour estimation method, using field data, is needed for better designed bridges. The USGS will collect extensive abutment-scour information at low flows at about 50 older bridges in Maine. The information collected at the bridges will provide the necessary data to test the computation of abutment scour using existing methods and may also allow the creation of a new method. HEC-RAS, a computer step-backwater model, will be run for each bridge to get estimates of hydraulic properties such as flow depths and velocities. Three to five promising methods of estimating abutment scour will be tested, the Froelich method, the Sturm method, the Melville method, and a regression analysis/envelope curve of locally collected abutment scour vs. abutment and (or) hydraulic parameters (if development is successful). The Maryland DOT procedure may also be tested.

    Language

    • English

    Project

    • Status: Completed
    • Funding: $104000.00
    • Contract Numbers:

      PIN 12182.00

    • Sponsor Organizations:

      Maine Department of Transportation

      Research Division, Child Street, 16 State House Station
      Augusta, ME  United States  04333-0016
    • Performing Organizations:

      Maine Department of Transportation

      Research Division, Child Street, 16 State House Station
      Augusta, ME  United States  04333-0016
    • Start Date: 20040101
    • Expected Completion Date: 0
    • Actual Completion Date: 0
    • Source Data: RiP Project 9303

    Subject/Index Terms

    Filing Info

    • Accession Number: 01458880
    • Record Type: Research project
    • Source Agency: Maine Department of Transportation
    • Contract Numbers: PIN 12182.00
    • Files: RiP, STATEDOT
    • Created Date: Jan 3 2013 12:52PM