混合砂礫床一様湾曲流路の平衡横断形状と Sorting について
1986 年 1986 巻 375 号 p. 151-160
詳細
1986 年 1986 巻 375 号 p. 151-160
A mathematical model for defining the bed topography and the bed material size distribution in uniformly-curved bends is developed, in which the coarsening of sediment size toward the outside is predicted and the bed topography is calculated coupling with the lateral sorting. The major agency for sorting is that coarser grains feel a larger ratio of transverse gravitational force to fluid force than finer grains. It is revealed that the sorting reduces the depth of scour considerably in the outer area of bends. The model is tested with a laboratory test, and it is applied to an actual river, both of which support the present theory.
