In the present paper physical model tests are carried out in order to further understanding of hydrodynamic processes that surround a Middle-Rubble Mound structure when it has been subject to irregular waves. Particularly, the transmission coefficient, as well as the spectrum transformation has been analyzed. This analysis suggests that with an increase of wave height around a Middle-Rubble Mound, the transmission coefficient extremely increases at each water level (SS, HHW, MSL and LLW). Moreover, when the water level changes from SS to LLW, transmission coefficient suddenly reduces.

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