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Streambed scour evaluations and conditions at selected bridge sites in Alaska, 2013–15

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Beebee, R.A., Dworsky, K.L., and Knopp, S.J., 2017, Streambed scour evaluations and conditions at selected bridge sites in Alaska, 2013–15: U.S. Geological Survey Scientific Investigations Report 2017-5149, 67 p., https://doi.org/10.3133/sir20175149.

Summary

Streambed scour potential was evaluated at 52 river- and stream-spanning bridges in Alaska that lack a quantitative scour analysis or have unknown foundation details. All sites were evaluated for stream stability and long-term scour potential. Contraction scour and abutment scour were calculated for 52 bridges, and pier scour was calculated for 11 bridges that had piers. Vertical contraction (pressure flow) scour was calculated for sites where the modeled water surface was higher than the superstructure of the bridge. In most cases, hydraulic models of the 1- and 0.2-percent annual exceedance probability floods (also known as the 100- and 500-year floods, respectively) were used to derive hydraulic variables for the scour calculations. [...]

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Type Scheme Key
local-index unknown sir20175149
local-pk unknown 70194375
doi http://www.loc.gov/standards/mods/mods-outline-3-5.html#identifier doi:10.3133/sir20175149
series unknown Scientific Investigations Report

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journalScientific Investigations Report
parts
typePublication Place
valueReston, VA
languageEnglish
tableOfContents<ul><li>Abstract<br></li><li>Introduction<br></li><li>Methods<br></li><li>Results of Flood Frequency and Scour Assessments<br></li><li>Scour Calculations<br></li><li>Summary and Conclusions<br></li><li>Acknowledgments<br></li><li>References Cited<br></li><li>Appendix 1. Stream Stability Cross Sections<br></li></ul>
citationTypeReport

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