Abstract
This study discusses the target safety level of breakwaters against wave force in view of minimizing the life cycle cost. We considered both damage recovery cost and economic loss cost in the calculation of life cycle cost. We found that target safety level changes according to the condition such as extreme value distribution of waves and ratio of economic loss cost to damage recovery cost. Target safety levels of composite breakwaters were found to be different from those of breakwaters covered with wave dissipating blocks. In addition, target safety levels corresponding to the minimum life cycle cost were found to be different from the allowable safety levels by the technical standards.
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