In the construction of artificial rubble reef, rubble materials are usually dumped from a barge into the sea directly. The diffusion of materials in the longitudinal direction becomes large in use of the conventional method, which makes accurate construction difficult. In this study, the construction method which uses diffusion-reducing sheets in the longitudinal direction was developed. As a result of laboratory experiment, the effectiveness of the diffusion-reducing sheets became clear. This method was applied to actual construction site with water depth of 85m. As a result, the diffusion in the longitudinal was reduced clearly and the effectiveness of this method was demonstrated.
