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The wave transformation over the deep-sea coral reefs is an essential issue in the analysis of the reef ecosystem and the design of large reef-top structures.Extensive wave flume experiments are conducted to investigate the wave transformation processes over an idealized reef model.Detailed measurements of the wave height,the wave set-up and the wave-generated flow on the reef-top are made with and without the reef-top structure at various submerged depths and under different wave conditions.It is found that the reef-top structure has a significant influence on the wave breaking,the wave set-up and the wave-generated flow.The wave set-up increases with the increasing wave height and the decreasing submergence depth.However,the relationship between the wave set-up and the wave period is complex,influenced by the reef-top structure.