A SEDIMENT DISCHARGE FORMULA FOR VARIOUS TYPES OF SEDIMENT TRANSPORT IN A STEEP OPEN CHANNEL

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Four main types of sediment transport and their two intermediate types can be distinguished on movable bed in a steep open channel ; those are bed and suspended load types, debris and mud flow types, and intermediate types between bed load and debris flow types. The flow model for hyperconcentrated sand-water mixtures proposed by Hirano and Hashimoto (1995, 1997) can be applied to all types of flows with sediment transport in a steep open channel. The flow model consists of granular and inertial layers ; the intergranular stresses play major role in the former layer and inertial forces in the latter layer. On the basis of the flow model, sediment discharge formulas have been derived by Hirano and Hashimoto (1996, 1998 ). In the present study the sediment discharge formulas are compared with the experimental results and also with the other formulas. The calculation of sediment discharge formulas derived by Hirano and Hashimoto (1996, 1998 ) shows good agreement with experimental results.