Riprap Coverage Around Bridge Piers

by James F. Ruff, Colorado State Univ, Fort Collins, United States,
James R. Nickelson, Colorado State Univ, Fort Collins, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: Experiments were conducted to examine the effect of riprap size and coverage on reducing local scour at bridge piers. Pier diameter, bed material size, riprap size and diameter were varied during the study. Scour depths with no riprap coverage were compared to scour depths when a single layer riprap mat with 100 % and 50% areal coverage was in place. It was found that scour depths could be reduced by placing a riprap mat around the pier that is five to eight times the diameter of the pier. Scur depths and bridge piers with riprap protected mats were reduced by 40% to 99% compared at scour at unprotected piers.

Subject Headings: Riprap | Scour | Piers | Bridges | Bed materials | Bridge tests | Construction materials

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