2022 Fiscal Year Final Research Report
Construction of a unified sediment transport model and development of a numerical prediction technique on a riverbed consisting of materials ranging from clay to large gravel.
| Project/Area Number |
20H02262
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 22040:Hydroengineering-related
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| Research Institution | Waseda University |
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Principal Investigator |
Sekine Masato 早稲田大学, 理工学術院, 教授 (60187854)
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| Co-Investigator(Kenkyū-buntansha) |
平松 裕基 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), 研究員 (10731812)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 移動床水理学 / 流砂 / 河川工学 / 水工水理学 |
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| Outline of Final Research Achievements |
In this study, we focus on two important phenomena that have not yet been addressed or have been treated insufficiently in the past. Specifically, we have conducted research with two objectives: (1) to clarify the influence of "large gravel" or "clay" on the sediment transport process of sand and gravel, and to investigate their mechanisms, and (2) to construct a new framework to reasonably treat as a bed material load as one unified sediment transport process. We have found the necessary findings. Based on these results, we developed a method to reproduce the phenomena by numerical simulation.
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| Free Research Field |
移動床水理学、河川工学、水工水理学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，「大礫」ならびに「粘土」の存在が河床上で生じる砂礫の輸送に及ぼす影響を定量的に明らかにしており，あわせてこのような現象を特徴付ける「遮蔽係数」などのパラメータの評価式を導き出しました．さらに，このような幅広い粒度分布を有する河川地形の変形プロセスを数値計算により再現する手法の開発しました．これらは，流砂現象の理解を大きく広げるものであり，従来であれば計算できなかった河床の変動などのプロセスを科学的根拠に基づいて予測できるようになったという意味で，学術的に大きな進展と捉えることができます．また、Bed material loadに関しては、新たな扉を開く可能性のある研究と言えます。
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