A PROPOSAL FOR SIMPLIFIED MODELIZATION OF BREAKWATERS COVERED WITH WAVE-DISSIPATING BLOCKS IN SPH METHOD

Abstract

 In numerical analyses using particle methods, reappearence of wave dissipation effect has been realized through some methods as to duplicate 3-dimensional configuration of wave dissipation blocks accurately or to assume artificial forces. On the other hand, a concise model not to require high spatial grid resolution or complex presumption is necessary from the practical viewpoint. A simplified model of wave dissipation blocks in the 2-dimensional SPH method is proposed in this study. This paper aims to confirm the dupulicability of the model for permeabilities of wave dissipation blocks and wave forces exerting on the seawall behind the blocks in comparison with those obtained from the previous studies.
 Wave dissipation blocks are simply modelized as to provide total permeability appropriately by arraying some little square or triangle structures. Wave transmission coefficients of block mound breakwaters and wave forces exerting on seawalls with wave dissipation blocks by the simulation agree with those derived from the design formulae under the condition of no wave overtopping, which verifies the fine applicability of our model.