小樽港北防波堤の国際的評価

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  • A STUDY ON INTERNATIONAL EVALUATION FOR THE NORTH BREAKWARTER OF OTARU HARBOUR

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The North breakwater of Otaru Harbour, which was designed and constructed by Japanese engineers in Meiji Period, was the first modern breakwater facing the open sea in Japan. It has not yet been evaluated in the history of harbour construction throughout the world. The North breakwater in Otaru City is well known to have been constructed by sloping block system which was one of the most mechanical construction methods in those days.<BR>The present study addresses that Colombo breakwater was the complete form of breakwater constructed by sloping block system and the model of the North breakwater. To evaluate the North breakwater, we compared the technical level of the North breakwater with that of the Colombo breakwater by some essential factors of harbour construction technology in the 19th century in the world. The study results reveals that the former was superior to the latter in terms of three engineering factors and that the highest technology was adopted in the construction of the North breakwater of Otaru Harbour.

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