Abstract
ÔKUMO Tosimiti, the Secretary of the State for Home Affairs of the Japanese Government in Meizi Era, proposed the seven development projects in the northeastern area of Japan in March 1878. The construction of the Nobiru Port was the core project among these development projects and the first port construction works that introduced the modern western port engineering technology in Japan.
The master planning and engineering designing was formulated in charge of C. J. Van Doom, the chief engineer of the Dutch civil engineering team employed by the Japanese Government. Nobiru. Port construction project started in July 1878.
The construction works of the inner port, the first stage of the total plan, was completed in 1882. But the two jetties in the mouth of the inner port were destroyed by the high waves through the typhoon in September 15, 1884, which caused the abandonment of the Nobiru Port.
This study revealed the following points from the standpoint of port engineering technology that were not clarified until now;
1. We estimated the wave height that caused the collapse of the jetties.
2. We revealed the structure of the jetties through the decipherment of the old documents.
3. We revealed the process of the collapse of the jetties.
