APIA PORT BREAKWATER RECONSTRUCTION

Samoa is located in the South Pacific Ocean, about halfway between Hawaii and New Zealand. The first wharf at Apia (185m long) was constructed 1966 a 100m long breakwater with 8t Dolos armor units 1988-89 to provide shelter. Following large cyclones early 1990s, rehabilitated 1996 larger 20t units. In 2003 solid concrete crown wall added mitigate wave transmission into harbor. There limited toe scour protection multiple have broken legs, cracks rust stains from corroding steel reinforcement. design intent of upgrading project improve resilience extreme climatic natural disaster events. Reconstructing higher crest, roundhead, new units, support apron selected as most appropriate option meet criteria. Physical modelling undertaken verify optimize design. Wave calibration indicated good correlation numerical showed that for offshore heights ~11.5m greater near structure height depth (Hs ~9.1m). physical model testing existing on rear slope are unstable under 1percent AEP event base rock support. Further using 16m3 Xblocs leeside which successful detailed completed accordingly.