ANALYSIS OF SALTATION CHARACTERISTICS OF BED-LOAD TRANSPORT IN FLOWING WATER

摘要

The study of bed-load transport is of great significance both in theory and in practice.Thispaper discusses the saltation of bed-load solid grains in flowing water.Experiments and theoretic analysis havebeen made by means of high-speed photographing and advanced data processing technique with a combinedmethod based on mechanical and statistical theories.It indicates that the saltation is the main form of thebed-load transport under ordinary flowing conditions.In the meantime,taking suecessive saltation as the mod-el of bed-load transport,systematic analysis has been made with regard to the kinematic properties andmechanism of saltation.The statistical analysis shows that the probability density functions of the relativeheight and length of saltation are in conformity with Γ-type distribution,while the probability density func-tions of the relative velocities of saltation are in conformity with the Gaussian distribution.