2022 年 78 巻 2 号 p. I_1099-I_1104
This study investigates the basin scale sediment transport processes in the Sangu river in Bangladesh by using a rainfall-sediment runoff (RSR) model. One year numerical simulations are conducted with two different sediment transport formulas and the results were compared with observed sediment size distribution and suspended sediment discharge. As a result of computation, a clear longitudinal sediment sorting is shown in one case, while that is not shown in the other case, and the difference between two cases is explained by the difference in the erosion rate of suspended sediment formula. The sediment sorting significantly affects the results of the basin scale sediment transport analysis. Thus, we conclude that in a river dominated by suspended sediment such as the Sangu River, it is very important whether the erosion rate of suspended sediment and associated transport processes can evaluate the sorting process.
