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Physical Modelling of the Wave Transmission over a Tetrapod Armored Artificial Reef

Shin, S.; Bae, I.-R., and Lee, J.-I., 2019. Physical modelling of the wave transmission over a tetrapod armored artificial reef. In: Lee, J.L.; Yoon, J.-S.; Cho, W.C.; Muin, M., and Lee, J. (eds.), The 3rd International Water Safety Symposium. Journal of Coastal Research, Special Issue No. 91, pp. 126-130. Coconut Creek (Florida), ISSN 0749-0208.Two-dimensional laboratory experiments were conducted in the wave flume to investigate the wave transmission phenomena over both impermeable and permeable artificial reef structures, which were armored with tetrapods. Different cases of the experimental conditions were included by changing permeability, relative crest height, relative crest width, wave steepness and so on. A modified empirical formula from the existing formula was proposed to predict the wave transmission coefficient over the various specifications and structural designs of the artificial reef. The proposed formula successfully predicted the wave transmission coefficients for permeable, partially permeable and impermeable structures. Therefore, in this study, the empirical formula of the wave transmission over the artificial reef was improved from the existing formula by including various permeable cases.