2020 Fiscal Year Final Research Report
Study on estimation of sediment transport rate on bars under the condition that bed composed of mixed sediment
| Project/Area Number |
18K04374
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 22040:Hydroengineering-related
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| Research Institution | Meijo University |
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Principal Investigator |
MIZOGUCHI ATSUKO (寺本敦子) 名城大学, 理工学部, 教授 (40362280)
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| Co-Investigator(Kenkyū-buntansha) |
知花 武佳 東京大学, 大学院工学系研究科(工学部), 准教授 (10372400)
川村 里実 (山口里実) 国立研究開発法人土木研究所, 土木研究所(寒地土木研究所), 主任研究員 (70399583)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | 交互砂州 / 流砂量 / 混合粒径 / 土砂管理 |
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| Outline of Final Research Achievements |
The characteristics of the particle size distribution of the riverbed materials were investigated in some rivers. The plane distribution of the particle size of riverbed materials were also observed in some rivers with image analysis technology. On the other hand, one series of flume experiments were taken in order to investigate both the characteristics of sand particle motion and water flow, and also another series of flume experiments were done in order to examine in detail of bar motion accompanied with the change of the sand supply condition. Experimental results show that suspended load influences bed load transport, and also show that active motion of bed load correspond to activity of bar migration. These experiments results also indicate that differences of sediment transport motion play different roles to bed changing.
This research indicates important future topics and discussion in order to estimate sediment transport rate considering motion of each particle size.
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| Free Research Field |
河川工学，移動床水理学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究課題の検討を通じ，掃流砂，浮遊砂として流下する土砂が河床や河川に形成している砂州に対して果たす役割，流れに対する役割，他の粒径の動きに与える影響が重要な視点となりえることなどを示した．これらは，取り扱う事象によっては，河床と流れの境界面を明確に分けて，流砂量評価をしてきた既往の知見からの脱却の必要性を示しており，学術的な意味がある．なお，流砂現象は河川の洪水処理能力に関係し，昨今の災害現象にも大きく関わるため，本研究課題は社会的にも影響を及ぼすと考える．
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