The theory of characteristics is applied to analyze two‐dimensional unsteady flow over a bed of fine sediment. The sediment is assumed to be so fine that suspension is the predominant mode of transport. An additional equation for sediment diffusion is introduced. As a result, the number of characteristics is increased, but the characteristic directions can be determined without solving high‐degree algebraic equations. Results from a one‐dimensional version of this procedure agreed reasonably well with known data.
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Lin et al. (1984) studied this question.
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