Pier scour in clear-water conditions with non-uniform bed materials
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2012-05-01
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Edition:Laboratory report; Nov. 2009-May 2012.
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology;
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Abstract:Pier scour design in the United States is currently accomplished through application of the Colorado State University
(CSU) equation. Since the Federal Highway Administration recommended the CSU equation in 2001, substantial
advances have been made in the understanding of pier scour processes. This report explains a new formulation for
describing scour processes and proposes a new equation for pier scour design. A critical review of selected studies is
summarized. A simplified scour mechanism is proposed in terms of a pressure gradient resulting from the flowstructure,
flow-sediment, and sediment-structure interactions. An equilibrium scour depth equation is proposed
based on this understanding of the scour mechanism and is validated and refined by a combination of laboratory
and field data. The proposed equation is primarily applicable to clear-water scour conditions with non-uniform coarse
bed materials.
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