Abstract
In gravel bed rivers, shape of sediments has significant influence on the sediment transport. Sediment transport analysis was refined by extending the movement characteristics of different shapes of sediments. At first, the mean velocity of "i" sized particle: "Vpi" was analyzed for each Zingg's shape category "m" through the laboratory experiments. In the experiments, 4 to 32 mm sediments sampled in the Oppegawa River were colored and used at different flow conditions and bed slope. Moreover, more than 300 particles were analyzed through the Fourier analysis to get the shape roughness to compute the effective tractive force. Then, sediment transport data of the Big Wood River in USA was used to evaluate the modified approach. In the revised stochastic model with shape effect (SMSE), the significant harmonic order that can represent the significant difference of particle shape was calibrated. The results of analysis were found in reasonably good agreement with the measured quantities.
