Abstract
To increase calmness at Furubira Fishery Port in Hokkaido, Japan, construction of an east groin was planned. One requirement for the groin was to efficiently controls invading waves from the outside of the port and reflected waves from inside. A permeable double slit-caisson structure was selected for its permeability and ability to dissipate waves on both sides. A groin with such a structure dissipates waves on both its seaward-facing and portward-facing sides, allowing it to reduce reflective waves and increase calmness inside the port. A hydraulic model test using a two-dimensional wave channel revealed that incorporation of holes in the internal wall of the caisson affords wave-dissipating ability against long-period waves.
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