ABSTRACT
The outer banks in river bends are subject to severe bank erosion due to secondary flows. In this paper the effect of horizontal footing on movement and reduction of outer bank scour hole has been investigated. To reach such goals an experimental bend flume of 90 degrees was built and series of tests conducted. The 75 mm wide horizontal footing was installed at the outer bank in four different elevations of 0, 20, 40 and 60 percent of maximum scour depth. By comparison of the bed topography with and without footing, a maximum scour reduction of 45% was obtained with footing installed at elevation of 40% of the maximum scour depth. The results of this study reveal that footing redistributed the bed topography in such a way that the point of maximum scour hole has been shifted from the outer bank to the center of the flume and bed topography became more uniform.
