Analysis of Local Scour at Bridge Piersby Han-Bin Liang, Philip Williams & Associates, San Francisco, United States,
Jorge Romero-Lozano, Philip Williams & Associates, San Francisco, United States,
Abstract: Many studies have been performed on the cause and effects of local scour at bridge piers, and various prediction equations have been generated based on these studies. The general approach for estimating the scour in a pile group has been to treat the group as a unit and apply a prediction equation to come up with the estimated scour depth. A field study was performed at Interstate Highway 580 (I-580) Alamo Canal Bridge in Pleasanton, California and the study found that pile group scouring can vary considerably in depth due to the formation of disparate flow patterns through the pile group. This phenomenon, also known as the thalweg movement, should be taken into account when dealing with a large pile group.
Subject Headings: Scour | Piers | Bridge tests | Field tests | Pile groups | Highway bridges | Highways and roads | Canals | North America | California | United States
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