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To deal with transitional flow from debris flow through sheet flow to bedload flow, a riverbed shear stress formula was developed by applying the existing theory of debris flow to the sediment layer and Manning's theory to the water layer. We also propose a new method for determining the transitional condition of the sediment transport region to a continuous transition of equilibrium concentration. Numerical simulations were performed using an existing model and our new model. Results fordoi:10.13101/ijece.10.130 fatcat:oymdycytafdorbiebxaynqc2uy