Abstract
A sediment sorting is one of the fundamental factors of beach process. In this paper, experiments and the numerical simulation of the vertical sorting process of graded sediment in sheet flow regime under oscillatory flow have been performed. Since the key of graded sediment transport is the particle/particle interaction, the mechanics of sorting has been investigated in detail by the movable 3D bed simulator based on the distinct element method. Furthermore the internal structure of the sheet flow layer, where direct measurement of sediment-particle motion is difficult, has been examined. A sorting process of sediment is reproduced well by the present simulation.
