11:55 〜 12:10
[S04B-05] Response of alternate bar morphodynamics to sediment supply condition under a cycled hydrograph
キーワード：Hydrograph, Sediment supply, Alternate bars, Numerical simulation, Wavelet analysis
Sediment supply plays an important role in the river morphology. According to the concept of hydrograph boundary layer (HBL), upstream river bed change caused by imbalance of sediment supply to the capacity is able to propagate only limited length, and will have no effect on the river bed beyond such short length. In this study, unsteady flow with equilibrium or constant sediment supply has been employed in straight channel without deformable bank to simulate alternate bar morphodynamics. The results suggest the case of HBL may have created additional complexity still affect the formation of the alternate bars beyond the HBL.