Temporal Development of Local Scour at Bridge Piersby Yee-Meng Chiew,
Bruce W. Melville,
Abstract: The temporal development of local scour depth at circular cylindrical bridge piers is considered. New data are presented and used to quantify the influence of flow duration on the depth of local scour under clear-water conditions. A method is given for determination of the time for development of the equilibrium depth of scour for a given pier, sediment and approach flow velocity and the concomitant estimation of the scour depth at any stage during development of the equilibrium scour hole. The results show that the scour depth after 10% of the time to equilibrium is between about 55% and 80% of the equilibrium scour depth, depending on the approach flow velocity.
Subject Headings: Scour | Equilibrium | Piers | Flow duration | Bridges | Fluid velocity | Sediment
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