THE SIMPLE NUMERICAL ANALYSIS FOR REPRODUCING THE DAMAGE PROCESS OF RUBBLE MOUND

Abstract

 In the construction of rubble mound, damage to the rubble mound by high waves is a problem. Hydraulic model test and numerical analysis are considered to be the methods to verify the damage of rubble mound. In the numerical analysis, the Distinct Element Method(DEM) and the particle method are generally considered, but these methods are computationally demanding. In the construction field, it is necessary to predict the extent of damage as soon as possible. The authors focused on the fact that the damage process of rubble mound is similar to the advection-diffusion phenomenon.

 In this study, the one-dimensional advection-diffusion equation was solved by the finite difference method to reproduce the damage process of rubble mound. The advection velocity C and the diffusion coefficient ν were tuned based on past experimental data. As a result, the reduction of the crest elevation was reproduced by setting the diffusion coefficient ν, and the deformation to the shore was reproduced by setting the advection velocity C. Although this method is completely new, some issues remain. However, since this method is very simple, it is expected to be extended to 3D in the future.