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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

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Publication Number:  FHWA-HRT-12-022    Date:  May 2012
Publication Number: FHWA-HRT-12-022
Date: May 2012


Pier Scour in Clear-Water Conditions With Non-Uniform Bed Materials


After critical review of pier scour under clear-water conditions with non-uniform sediment mixtures, a scour mechanism for understanding pier scour processes and a scour depth equation for design were proposed. In general, pier scour results from flow-structure-sediment interactions, and equilibrium scour depth is determined by the flow-structure and flow-sediment interactions. The following conclusions are presented: