水流による砂粒の運動機構に関する実験

Abstract

It is one of the most important problems in sediment hydraulics to establish themechanics of movement of a sand particle in a turbulent stream. Some experiments onthe motion of a spherical sand particle were carried out with a storoboscope to makeclear the hydrodynamic behaviour. It is concluded from the results of the experimentsthat there are two types in the motion of a particle, rolling and saltation, and that theuplift force acting on a particle would be not so great as Yalin and Kishi used in theirtheories of sand transport. An equation of motion f or rolling of a particle in a turbulentstream is established and the result is in good agreement with the experimental ones.And some characteristics of rolling and saltation of a particle are considered.