NUMERICAL SIMULATION FOR REDUCTION EFFECTS ON TSUNAMI INUNDATION BEHIND POROUS VERTICAL BARRIER

Abstract

 This paper investigates the relationship between length of the porous barrier, distance from the barrier to a rectangular structure, and the characteristics of shielding area behind the barrier. For this purpose, systematic numerical simulations are carried out based on high-resolution scheme and quadtree grids. The results deomonstrate that tsunami inundation depth is reduced inside the shielding area. The transverse length of shielding area is related to the lateral length of the barrier regardless of the porosity of the barrier. Numerical simulations show substantial reduction of hydrostatic pressures acting on the structure installed behind the barrier. Hydrostatic pressures acting on the structure approach constant values with the increase of the ratio of detached distance of the structure to the lateral length of the barrier. Tsunami run-up height in front of the structure can be evaluated from the corresponding specific energy in case of no structure.