2006 年 22 巻 p. 241-246
PLB (Porous Layer Boundary) method was proposed by Hirayama (2001) for a Boussinesq-type wave transformation model in order to calculate partial reflected waves on both breakwaters and revetments covered with armor blocks. The modeling of horizontal distribution of porosity in porous media is improved in this study.
The porosity of improved PLB is estimated by integrating vertical distribution of porosity from sea bottom to water surface, which consists of armor block layer and water layer. This modeling is similar to the definition proposed by Madsen et. al. (1997) or Kennedy et. al. (2000), therefore the newly proposed PLB method can also calculate moving shoreline as the porosity of armor block layer is very small. The calculated reflection coefficients at sea wall covered with armor blocks agree with the results of model experiment very much.