Optimal Construction Method of Artificial Reef Considering Diffusion and Accumulation Property of Dumped Materials

Abstract

In the construction of artificial reef in deep water, constitutive materials are usually dumped from a barge into the sea directly. In case that rubbles are used, dumped rubbles are not accumulated effectively on the seabed in a conventional method because significant diffusion occurs in the longitudinal direction of a barge during their fall. In this study, tank-coverage sheet is proposed to reduce the diffusion of the rubbles. The effectiveness of the diffusion-reducing sheets was confirmed, and diffusion and accumulation property of dumped rubbles was clarified by laboratory experiment and actual construction. The optimal construction method of artificial reef is proposed by use of the methods for predicting the movement of dumped materials due to flow and accumulation shape and for reducing the diffusion during their fall.