Top Width of Pier Scour Holes in Free and Pressure Flow

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by E. V. Richardson, Resource Consultants & Engineers, Inc,
L. Abed, Resource Consultants & Engineers, Inc,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: The maximum top width of the local scour holes at piers is shown to be a simple function of the scour depth and the angle of repose of the bed material in water. Knowledge of the top width of scour holes at piers and abutments is important in the determination of the extent of riprap needed as a scour countermeasure, to determine that local scour holes do not overlap and to determine the zone near abutments where the main flow in the river and the flow around the abutment interact. Equations for predicting the width of the local scour hole in free and pressure flow are given.

Subject Headings: Scour | Piers | Bridge abutments | Pressurized flow | Bed materials | River flow | Free flow | Bridges |

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