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The Influence of Exposed Footings on Pier Scour Depths

by Lisa M. Fotherby, Colorado State Univ, Fort Collins, United States,
J. Sterling Jones, Colorado State Univ, Fort Collins, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

Data compiled from past test efforts are combined in this article with the results of two new flume test studies. The combined material, presented graphically, suggests a method for adjusting values from pier scour depth equations to reflect the presence of caissons, symmetrical footings, and symmetrical pile caps. If the top surface of the caisson, footing, or pile cap is located at bed level, the structure serves to reduce scour. If the top surface of the structure is located above bed level and the structure protrudes into the flow, scour depth can be increased. When footings and pile caps become partially undercut by scour, there is a release and maximum scour depths decrease. Finally, graphical results demonstrate the pattern of scour depth reduction as structures such as pile caps are moved off the channel bed.

Subject Headings: Scour | Footings | Piles | Pile foundations | Piers | Caissons | Underwater structures

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