Author(s): Ben Ioppolo; Seung Ho Hong; Terry Sturm; Thorsten Stoesser
Linked Author(s): Terry Sturm
Keywords: No Keywords
Abstract: Laboratory experiments were carried out to investigate how the presence of a pair of bridge piers aligned perpendicular to the flow direction would affect the formation of the scour hole around the piers. The experiments were conducted in the Georgia Tech 1.1m wide and 24.4m long tilting flume. The piers were arranged 6.6pier diameters (D) apart measured center to center in a flat sand-bed where the average grain size was 1.1mm. Uniform approach flow conditions were established at a flow depth of 0.16m and an average velocity of 0.33m/s. These conditions correspond to ▲ based on the Shields diagram and represent clear-water scour conditions. The experiments were run until equilibrium scour conditions were reached. After the flume was drained, the bathymetry around the piers was measured in detail. Velocity profile measurements around the piers were made using an ADV system before scour. Differences in the velocity profiles are observed mainly downstream of the pier (s), which is reflected in the scour pattern.
Year: 2009