The Effect of Convex-flat Submerged Vane Angles of Attack and Height on Bridge Pier Scouring

One of the methods to decrease scour around the bridge piers is the use of submerged vanes. Vanes change the regime of bed load movement that led to control place of deposition and erosion. The function of vanes to reduce scour around the bridge piers and sediment movement in the region of vanes due to down flow in front of them are affected by arrays of the vanes. In the present study¡ physical hydraulic model testing was performed to investigate various angles of attack and Height of convex-flat vanes. Experiments were conducted in a 10m long and 0.3m wide flume and a cylindrical pier of 2.54 cm diameter. Clear-water scour tests with u/uc=0.92 were performed. The length of the vanes was equal the pier width. The highest reduction in scour depth was achieved an angle of 20° for a vane height equal to 0 cm.