The submarine cable for Yongsu wave power plant was cut in 2014 winter.This study investigated the probability of high-wave occurrence exceeding the 50-year return period and the underestimation of armor unit weight used to protect the cable.The observation data from KMA buoy and the hindcast wave data were reviewed to determine the return period of wave height during the winter.In order to investigate the armor unit weight of cable-protection,we calculated the required weight of armor unit using not only Design Standard for Harbor and Fishery Port,but also the previous researches for the wave with large incident angle.As a result,it appeared that the high wave exceeding the 50-year return period did not occur during the winter of 2014 and the armor unit weight of the cable protection was not sufficient to sustain the obliquely incident wave,which induced the cable protection failure.
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