Abstract
Stability of concrete armor units with tight interlocking on the rubble mound was examined experimentally for both regular and irregular waves. Especially, focusing on the reflected waves from the sloped mound, stability of the concrete units against waves is discussed, such as the reflection coefficient from the sloped mound and the relation between the displacement of the unit and spatial variations of partial standing wave height on the slope. By using the damping wave theory, wave height distributions and wave forces on the concrete unit about the sloped mound were also examined theoretically. It was pointed out that location of the node and anti-node of standing waves on the sloped mound is closely related to the displacement of the armor unit, especially for regularly placed units.
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