Abstract
This study deals with local scour in downstream of bed protection works. In order to establish the reasonable design of bed protection works, the experimental study was carried out in the case of sudden change in bed roughness longitudinally from a rough bed consisting of several types of bed protection works to a movable bed under dynamic and static condition of bed load. Variations of bed profile and the maximum depth of scour hole were discussed and flow characteristics, such as, velocity distribution and bed shear stress were measured at several stages of scour. As the result, we proposed a method to reduce scour depth by using rubble works.
