South breakwater in Nagasaki fishing port was almost damaged by typhoon 8712. The south breakwater had repaired cautiously with amendment of design wave and improvement of breakwater type. The safety of breakwater was certified by hydraulic model test. But in 1991, three huge typhoones attacked west coast of Kyusyu where Nagasaki fishing port locates. South breakwater have been damaged heavy again.
The process of these damages and repairs suggest many things about safety of breakwater and fluctuation of climate.