Abstract
Until now, offshore areas of Hokkaido coast faced on the Okhotsk sea have rarely been utilized in winter seasons because of pack ice driven to the coast. To utilize the sea areas more fully, it is necessary to control sea ice by ice barriers.The more the sea surface off the coast is covered by the sea ice, the more the wave heigh near shore is damped. Authors experimented on the attenuation of wave height due to ice cover by using model ice plates. Finally, the relations between the transmission coefficient under the various wave and ice conditions have been found.
