AbstractIrregular wave tests have been conducted to research into the stability characteristics of armor units for a rubble foundation of a composite breakwater. A cover layer to protect the rubble foundation from erosion had two layers of tetrapods. Waves higher than H]_/]_Q (the average height of the highest 10% of all waves) caused damage to armor units at the point of critical stability. This suggested that wave height changes in the surf zone should be taken into consideration for design purpose.
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