Development of n-line numerical model considering the effects of beach nourishments.

Abstract

This study is concerned with N-line model that takes into account the contour line changes after beach nourishment. The behavior of the sand materials after the beach nourishments is represented using two-dimensional advection diffusion equation in the horizontal plane. The effect of grain size of the nourished sand is considered in the advection diffusion equation. The contour line changes are calculated by solving the fundamental equation for the conservation of bed material, and combined with the advection diffusion equation. In this paper, firstly, the performance of the model is investigated by three model tests with the beach nourishment. Secondly, two model tests are carried out in order to investigate the influence of the effect of the grain size. Finally, the presented model is applied to the sand recycle project at Yumigahama coast, Japan, in order to investigate the applicability of the model.