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Effect of Sediment Supply on Morphodynamics of Free Alternate Bars: Insights from Hydrograph Boundary Layer
| Title: | Effect of Sediment Supply on Morphodynamics of Free Alternate Bars: Insights from Hydrograph Boundary Layer |
| Authors: | Dai, Huang Browse this author | | Iwasaki, Toshiki Browse this author →KAKEN DB | | Shimizu, Yasuyuki Browse this author →KAKEN DB |
| Keywords: | alternate bars | | sediment transport | | sediment supply | | hydrograph boundary layer | | gravel-bed rivers | | numerical simulation |
| Issue Date: | Dec-2021 |
| Publisher: | MDPI |
| Journal Title: | Water |
| Volume: | 13 |
| Issue: | 23 |
| Start Page: | 3437 |
| Publisher DOI: | 10.3390/w13233437 |
| Abstract: | Sediment supply plays an essential role in river morphology. However, the specific impact of sediment supply on river morphology is not apparent. According to the hydrograph boundary layer (HBL) concept, upstream riverbed changes caused by the imbalance between sediment supply and the capacity can propagate only a limited length and have a negligible effect on the riverbed beyond such a short length. We performed a two-dimensional morphodynamic calculation to test the concept of HBL, which was proposed under a one-dimensional simulation, meaning that the concept of HBL is still valid for plane changes in river morphology. We employed an unsteady flow with equilibrium or constant sediment supply in a straight, modeled gravel-bedded channel with an unerodible bank to simulate alternate bar morphodynamics. The results show that regardless of the sediment supply condition, the alternate bar features formed downstream of the HBL are considerably similar. This suggests that sediment disturbance at the upstream end has a negligible effect on the mobile-bed dynamic processes, including alternate bar formation and development downstream of the HBL. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/83887 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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