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The wave direction giving the minimum safety factor for a breakwater caisson is adopted as the design wave direction in the present design method. However, offshore wave direction is varied in itself, and the wave direction estimated by wind observation or wave hindcasting is distributed around the actual wave direction. In this paper, the sliding failure probability of breakwater caisson is computed by reliability design method considering the variation of offshore wave direction. The sliding failure probability depends on the width of the variation. It is important to estimate wave direction exactly especially for the design of deepwater breakwater. On the other hand, it is not so important for the breakwater constructed in surf zone, because the incident wave direction becomes almost normal to the shoreline by wave refraction, and the incident wave height depends mainly on the water depth. Additionally, the multi-directionality of incident waves may reduce the sliding failure probability.

EFFECT OF UNCERTAINTY IN WAVE DIRECTION ON SLIDING FAILURE PROBABILITY OF BREAKWATER CAISSON