ABSTRACT

Ota, T.; Kawamura, H.; Matsumi Y., and Hirayama, T., 2016. Evaluation of life cycle cost for wave-dissipating works considering occurrence probability of high waves. In: Vila-Concejo, A.; Bruce, E.; Kennedy, D.M., and McCarroll, R.J. (eds.), Proceedings of the 14th International Coastal Symposium (Sydney, Australia). Journal of Coastal Research, Special Issue, No. 75, pp. 675–679. Coconut Creek (Florida), ISSN 0749-0208.

This study deals with the influences of occurrence frequency and the duration of high waves on estimation of life cycle cost (LCC) for wave-dissipating works that consist of wave-dissipating blocks using Monte Carlo simulation. LCC is defined as sum of an initial construction cost and an expected repair cost of wave-dissipating blocks. As analysis results of high waves at four observation stations in NOWPHAS, the occurrence frequency of high waves can be approximated by the Poisson distribution. In the computation of LCC, occurrence frequency of high waves is assumed as once a year or is determined by using the Poisson distribution for comparison. The duration of high waves is given in consideration of its statistical characteristics. The optimum size of block that minimizes LCC agrees in most cases regardless of the occurrence frequency and the duration of high waves, however, the variation in the total repair cost during the in-service period is different depending on the occurrence frequency.

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