STABILITY NUMBER OF ARMOR BLOCKS ON REINFORCING HIGH RUBBLE MOUND FOR BREAKWATERS AGAINST TSUNAMI OVERFLOWS

Abstract

 For the objects of strengthen the stability of the breakwater against the tsunami, the method of raising the mound behind the breakwater is adopted. The required mass of armor blocks covering the mound is calculated by the proposed formula. The stability numbers of various armor blocks have already been shown. However, this number is in conditions where the mounds top end is submerged during tsunami overflow, and research on the high rubble mound is inadequate. In this study, the stability of armor blocks on reinforcing high rubble mound for breakwaters was examined. As a result of the experiment, it was found that the stability number of armor blocks was lower than the stability number of submerged conditions, and the influence on the stability of the shape of armor blocks was considered.