Local scour around large obstructions

May, R. and Willoughby, I. (1990) Local scour around large obstructions. Technical Report. Hydraulics Research Wallingford.

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Abstract

An experimental study, funded by the Department of the Environment, was made to determine the depth of local scour around large obstructions such as caissons and cofferdams used during the construction of bridge across rivers and estuaries. These structures are usually larger than the completed bridge piers so the construction phase can be more critical in terms of scour depth. Model and prototype data for large obstructions are limited but suggest that existing design formulae tend to overestimate the amount of scour. The present study therefore concentrated on cases where the width of the structure was large in relation to the depth of flow.

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