Abstract
This paper reports characteristics of local scour formed in downstream reaches of various types of bed protection works. Four types of bed protection works are used in experiments under a dynamic equilibrium condition to investigate time related changes in scour profiles, maximum scour depths and locations. The scour processes are also discussed in comparison with bed shear stress distributions measured in the maximum scour hole.In addition, field observations of scour profiles were carried out at a downstream reach of hollow-squared blocks in the Manganji River in Hyogo Prefecture, and the observed scour profiles and velocity distributions were similar to those in the experiments.
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