NUMERICAL SIMULATION ON SURFACE PARTICLES DISPLACEMENT OF 2-D UNIFORM SPHERE RUBBLE MOUND BREAKWATER

A basic study to assess the displacement process of surface particles of rubble-mound-structure armorlayer under normally incident monochromatic waves has been conducted. The present study tries toinvestigate the relation among wave-induced pressures, velocities, and forces acting onto the armor particlesof rubble mound breakwater slope, and accordingly the reaction of the particles against those forces. At thesame time, the relation among wave height, wave period, and slope angle of the structure on the particleinitial movement has been assessed. A two-dimensional numerical reshaping-model of uniform sphereparticles breakwater was developed to study this phenomena. The simulation involved two separate models, i. e. wave model and displacement model, which are linked by iteration.It was observed that the maximum resultant wave forces always exist close to the water line during waverun-up or run-down and cause considerable displacement of particles at this area.