A sloping-slit caisson breakwater, designed by the authors, was constructed at a fishery port using the new "precast-form caisson" (PFC) method. The sloping-slit caisson combines the advantages of an upright-slit caisson and a sloping-top caisson. It reduces wave forces by a front slit and a wave chamber. The downward force acting on the slope increases the caisson stability. It was found that the PFC method simplifies construction and saves labor in construction of the caisson.

Development of a sloping-slit caisson breakwater

Many types of breakwater have been developed to withstand the emormous wave force of a deepsea area.However, most have not proven viable in terms of constructability, economy and so on.The sloping slit caisson is expected to overcome these problems. It acts to dissipate wave energyby a front perforated wall and a wave chamber.The downward force acting on the slope increasesthe caisson's stability.This study describes the efficiency, design and construction method, and then explains the resultsof actual construction.

Toshihiro Miwa

Papers

Development of the sloping slit caisson