Abstract
Recently we are required to construct sediment routing model which can explain dynamics of not only quantity of sediment (sediment discharge) but also quality of sediment (sediment size distribution) from mountainous slope to coastal zone through river network. One of the characteristics of sediment transport phenomena is that mountainous slope has a wide range of grain size distribution. Hence, in this paper we proposed the model that describes dynamics of sediment mixtures with a wide range of grain size, and investigated the applicability of model by carrying out experiment with three kinds of grain size distributions. For the purpose of explaining the grain sorting process on bare slope, we applied proposed model to the field observatory results in Tajimi, 1954 to1958, obtained by Tsuchiya. The model approximately explained the temporal and spatial variations of grain size distribution with a wide range of sediment mixtures with initial geometric standard deviation of σg=12.5.
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