第24回応用力学シンポジウム

講演情報

一般セッション(第四部門:流体力学)

第四部門:流体力学(B)

2021年5月15日(土) 10:55 〜 12:40 D会場 (D会場)

座長:音田 慎一郎(京都大学)

11:55 〜 12:10

[S04B-05] Response of alternate bar morphodynamics to sediment supply condition under a cycled hydrograph

*Huang Dai1, Toshiki Iwasaki1, Yasuyuki Shimizu1 (1. Hokkaido University)

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.