关键词: 颗粒级配, 非均匀推移质, 床沙, 卵石河槽, 交换, 正态分布

Abstract: Based on the analysis of a large amount of experiment data in this paper, the relationship among the size distribution of nonuniform bed load, bed material and water factors is studied. According to the turbulent velocity following the normal distribution and exchange between bed load and bed material in an equal state in steady sediment transportation, the expression of the size distribution of bed load as well as the calculating methods is obtained by mechanics and mathematics analysis and experiment research. The size distribution curves of bed load calculated by the present method are in good agreement with experiment data.

Key words: size distribution, nonuniform bed load, bed material, gravel-bed stream, exchange, normal distribution