Abstract
DOUBLE CYRINDRICAL CAISSON BREAKWATER has been newly developed to create calm sea area in the deep and high-wave area.The 3rd District Port Construction Bureau determined to adopt this new type breakwater in Shibayama Port which is designated as a left-lettuge port. Before applying this new breakwater to Shibayama Port, in order to confirm the validity of the developed design method and security of construction work, field observation has been carried out since 1989. This paper reports some results of analysis from viewpoints of hydlaulic property of this new caisson.
