APPLICABILITY OF NUMERICAL ANALYSIS ON WATER VEIN CONTROL OF TSUNAMI OVERFLOWING BREAKWATER AND VERIFICATION OF SCOUR COUNTERMEASURES BY HYDRAULIC MODEL EXPERIMENT

Abstract

 In this study, we investigated a design of a tsunami resistant breakwater that is sound against the L1 tsunami, while allowing its overflow, and tenacious against the L2 tsunami. We analyzed the changes in overflow water veins due to differences in breakwater specifications using numerical wave channels and proposed a method for classifying the characteristics of overflow water veins according to facility specifications. We also conducted hydraulic model experiments on fixed floors and moving floors to verify the effectiveness of scour countermeasures.

 The numerical analysis could reproduce the formation of tsunami overflow water veins, and confirmed to be useful for selecting the structural weaknesses and countermeasures against tsunami overflow. In the hydraulic model experiment, the effectiveness of the abdominal mound against the L1 tsunami and the necessity for a scour prevention mat against the L2 tsunami which was set by the desk study were also clarified.