Abstract
Longitudinal and transverse sediment sorting and the formative mechanism of bars on non-uniform sediment bed in a straight open channel are studied in terms of flume tests, numerical analysis and theoretical analysis. The results support that the sediment sorting is formed on bars; finer sediment deposits around crests of bars and coarser sediment is left in troughs. Furthermore, it is found that the sediment sorting produces the difference of geometric and migration characteristics of bars between non-uniform and uniform sediment beds. Wave height, wavelength and migration velocity of sand bars on non-uniform sediment bed become smaller, shorter and faster, respectively, than those of bars formed on uniform sediment.
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