Abstract
This study deals with local scour downstream of bed protection works in order to establish a reasonable design method for the bed protection works. A relation between bed shear stress and maximum scour depth in the scour hole under dynamic conditions of bed load was derived using Newton's second law of motion. Comparing the relation with the results of experiments carried out using several kinds of bed materials, the effect of riprap works for reduction of scour depth was discussed. An equation to predict equilibrium maximum scour depth was also proposed and verified by using experimental data sets of several researchers as well as our own. The calculated values of the equilibrium maximum scour depth agreed with measured ones in the experiments.
