One-line Model for Predicting Shoreline Changes due to Beach Nourishments

SHIBUTANI, Y., KUROIWA, M. and MATSUBARA, Y., 2007. One-line Model for Predicting Shoreline Changes due to Beach Nourishments, SI 50 (Proceedings of the 9th International Coastal Symposium), 511 - 515. Gold Coast, Australia, ISSN 0749.0208 This study is concerned with a new one-line model that takes account of the shoreline changes after beach nourishments. The behaviour of the injected materials is represented using one-dimensional convection diffusion equation in the alongshore direction. The shoreline changes are calculated by solving the fundamental equation for the conservation of bed material, combined with the advection diffusion equation. In this paper, first, the proposed model was applied to the tombolo formation behind offshore structures in the field. Secondly, the performance of the model was investigated by a model test. Finally, the presented model was applied to the sand recycle project at Yumigahama Coast, Japan in order to investigate the applicability of the model. The computed results showed that the new model could qualitatively predict shoreline changes due to beach nourishments.