Abstract
A new predictive model of contourline change is developed, in which longshore sand transport formula and continuity equation of sand are solved numerically in each sublayer of the beach divided vertically. Modeling procedure of beach changes not only on the natural sandy beach but also in the vicinity of sea wall, groin, offshore breakwater, submarine canyon (dredged hole) is proposed. In each case model movable bed experiment is carried out to verify the effectiveness of the model. Good agreement between experimental results and numerical simulation is shown. This model has an advantage that it can predict formation of beach scarp due to dune erosion and sand dischange into a submarine canyon or an offshore dredged hole compared with the oneline (shoreline) model of beach changes.
