Scour Around A Barb In A Gravel-Bed Stream

Abstract

Barbs provide streambank erosion protection and are designed to operate as unsubmerged or partially submerged structures during low to moderate flow conditions and fully-submerged during high flow conditions. In this study laboratory experiments were performed for the fully submerged conditions with the primary goal to provide a better understanding of the effects of flow on scour evolution process around barbs, a process that has not been extensively investigated especially in gravel-bed streams. These findings are expected to help the design engineer to better identify the scour-hole location and depth for fully submerged conditions and lead to an improved design for barb structures in gravel-bed streams.