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Methodology and Estimates of Scour at Selected Bridge Sites in Alaska

Dates

Year
2001

Citation

Heinrichs, H. A., Kennedy, B. W., Langley, D. E., and Burrows, R. L., 2001, Methodology and Estimates of Scour at Selected Bridge Sites in Alaska: United States Geological Survey, Alaska Department of Transportation and Public Facilities: Anchorage, v. USGS WRIR 00-4151, 47 p.

Summary

The U.S. Geological Survey estimated scour depths at 325 bridges in Alaska as part of a cooperative agreement with the Alaska Department of Transportation and Public Facilities. The department selected these sites from approximately 806 State-owned bridges as potentially susceptible to scour during extreme floods. Pier scour and contraction scour were computed for the selected bridges by using methods recommended by the Federal Highway Administration. The U.S. Geological Survey used a four-step procedure to estimate scour: (1) Compute magnitudes of the 100- and 500-year floods. (2) Determine cross-section geometry and hydraulic properties for each bridge site. (3) Compute the water-surface profile for the 100- and 500-year floods. [...]

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