Abstract

A tsunami breakwater is constructed at the mouth of Kamaishi bay, the Iwate prefecture in the northem part of Japan.The caissons have slit members at their fronts.For the design of this type of caissons, it is important to estimate the wave pressure on the members as well as the caisson stability, The present paper experimentally studies on wave pressures of the slit members in a multi-directional wave basin.Compared wave pressures in uni directional wave with that in multi-directional one, the maximum wave pressure on a member becomes much Iager in the uni-directional wave condition.Therefore, the model test in multi-directional sea is important to get a reliable results.

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