Shinichi Kubota

On the Hydraulically Rational Shape of Armor Block and Foot-Protection Block for Rubble Mound of Composite Breakwaters

A rubble mound of composite breakwater is usually covered with armor blocks and foot-protection blocks to prevent its deformation. Although the design method for armor blocks and foot-protection blocks seems to have been almost established, nowadays, the site conditions are becoming severer. Therefore more rational design methods are required. The purpose of this study is to obtain the new knowledge correlating to the stability and cost reduction for the foundation of composite breakwater. Wave forces acting on the armor blocks were measured and the rational shape of block which reduces the uplift force was proposed. Hydraulic stability tests for foot-protection blocks with various scales were conducted and the rational designs were investigated.