Abstract
North Breakwater of Otaru Port was constructed from 1897 to 1908. Dr.HIROI was the leader of this construction. Sloping block system was applied to construct this upright breakwater. The breakwater has protected Otaru Port and City from waves. However, a result of a series of inspections has shown that these blocks, which are part of the rubble mound, were moved and the rubble mound was eroded by ocean waves. In order to keep the proper function of this breakwater, Otaru port office has investigated the present condition and CERI of Hokkaido has conducted hydraulic model tests on this breakwater. In addition, the design and the way of construction have been studied by reading literatures written at the time of construction. Based on these, repair plans were examined.
This report shows the results of the investigation, the hydraulic model test, and the repair plan of this breakwater.
