Abstract
This study deals with the influences of occurrence frequency of high waves on estimation of life cycle cost for a breakwater covered with wave-dissipating blocks using Monte Carlo simulation. The life cycle cost is defined as sum of an initial construction cost and a repairing cost of wave-dissipating blocks. In the computation of the life cycle cost, an occurrence frequency of high wave is assumed as once a year and is determined on the basis of statistical characteristics obtained from wave observation data. As analysis results of high waves at four stations in NOWPHAS, the cumulative frequency distribution for annual occurrence numbers of high waves can be approximated by the Poisson distribution. In the computation of the life cycle cost, the random numbers obtained from the Poisson distribution are used to determine the annual occurrence number of high waves. The optimum size of block that minimizes the life cycle cost is same in most cases regardless of the occurrence frequency of high waves, however, the variability of the total repairing cost during the in-service period is different depending on the occurrence frequency.
