SALTATION MOTIONS AND VERTICAL SORTING MECHANISM OF GRAVEL PARTICLES BY NUMERICAL MOVABLE-BED EXPERIMENT

Abstract

 The numerical movable-bed experiment was conducted to understand sediment transport mechanism in gravel bed rivers.The riverbed material used in the numerical experiment was spherical particles and followed Talbot grain size distribution.The whole grain size particles of the riverbed surface moved and vertical sorting occurred. And, it was found that the larger the particle size, the more they were at the above location in the river bed. In addition, it was confirmed from the trajectory of the particle motion that the small particles fall between larger particles of the river bed.