水流による Successive Saltation に関する研究

Abstract

In order to unify the theories of bed load transport and sediment suspension, it is importantto investigate saltating motion of sediment particles. In case of sediment transport by flowingwater, successive saltation appears and it is composed of irregular individual saltation paths. Theirregularity and the succession of individual saltations are caused by repulsion events of saltatingparticles with a sand bed. Considering these effects, stochastic modelling of successive saltation istried in this paper, and respective subsystems composing the model are inspected by some funda-mental experiments using a film motion analyzing technique. Moreover, a series of numericalsimulation of bed load transport process is carried out based on the proposed model, and thestochastic characteristics of individual saltations and successive saltation are inspected. Verticaldistribution of existence probability of bed load particles is also investigated by this simulation, which may be important from view point of the objective of this study.