Effects of Debris on Bridge Pier Scour (2010) / Chapter Skim
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Pages 107-111
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From page 107... ...
107 4.1 Applicability of Results to Highway Practice Approximately 83% of the 583,000 bridges in the National Bridge Inventory are built over waterways. Many, especially those on more active streams, will experience problems with scour, bank erosion, and channel instability during their useful life (Lagasse et al.
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From page 108... ...
At the outset of this study, only limited guidance was available on which to base critical public safety decisions during flooding on debris-prone rivers. There was a pressing need for accurate methods of quantifying the effects of debris on scour at bridge pier foundations for use by DOTs and other agencies in the design, operation, and maintenance of highway bridges.
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From page 109... ...
at the pier face compared to the baseline (no-debris) condition.
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From page 110... ...
the intensity of the plunging flow created by the debris blockage. In addition, the methodology as formulated accounts for the occurrence of the upstream trough when a rectangular debris cluster extends upstream a distance, L, greater than the approach flow depth, y, as well as the observation of maximum scour when L equals y for a rectangular accumulation of debris.
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From page 111... ...
• Necessary guidelines for predicting the size, location, and geometry of debris accumulations at bridge piers. • Methods for quantifying scour at bridge piers resulting from debris accumulations.
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