The purpose of this study was to investigate the change of length,opening width,and number of openings effecting on topography change around artificial reefs under erosive wave condition.Hydraulic model test was conducted to see sediment transport around the structures and the relation among the installation condition of the artificial reefs,generated velocity,wave deformation,and topographic change was reviewed.Experimental results show that the sediment transport rate was reduced;however,the scour around the structures was increased under the condition of having a single opening compared to the structures having a plurality of openings which shows inversely proportional to the size of Lr/W.
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