Abstract
Since rubble foundation of composite breakwater in construction has no armor layer, the stability of rubble stone for waves is generally low. Thus, it is important to know the stability and the extent of damage of rubble foundation in the view of construction. In the present study, hydraulic model tests were conducted to investigate a relationship between a stability of rubble foundation and crown height of rubble foundation. In the case of irregular waves, these results suggest that the extent of damage of rubble foundation and Ursell's number on the rubble mound correlate to a high degree. Added to this, it is shown that the method combined CERC's equation with CADMAS-SURF proposed by Matsumoto and Takahashi (1998) is valid for estimating a mass of rubble stone for regular waves.
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