Author(s)

K. Takahashi, H. Nakamura, T. Shibata, N. Usami & H. Saeki

Abstract

North Breakwater in Otaru Port is Japan's first full-fledged concrete block breakwater faced to outer sea and has total extension length 1,289 m. Investigation, planning, designing and construction of this breakwater were carried out under the initiative of Dr. Isami Hiroi. This breakwater was put into construction in 1897 and completed in 1908. North Breakwater constructed in Otaru Port by Dr. Hiroi's far-reaching perspective seeing of the future sufficiently fulfills its functions also nowadays after its completion about 100 years ago. 1 Introduction Hokkaido is an island located in the northern part of Japan and occupying about 22% of the territory of Japan. Full-fledged development of this island started about 130 years ago. Along with progress

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