Abstract
The sliding failure probability of breakwater caisson during 50 years is computed by reliability designmethod with the assumption that the occurrence probability distribution of the extreme values ofstorm surge fits the Weibull distribution. The storm surge increases the sliding failure probability ofbreakwater caisson in surf zone, because the raise of the water level reduces the caisson weight inwater and increases the breaking wave height. On the other hand, the storm surge has little influenceon the sliding failure probability of breakwater caisson in deep water, because the caisson height islarge compared with the variation of tidal level.
