Calculation method for open channel flows with multi-scale roughness in gravel bed rivers based on dynamic wall law
Project/Area Number |
26420505
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Hydraulic engineering
|
Research Institution | Hiroshima University (2017) Chuo University (2014-2016) |
Principal Investigator |
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Project Period (FY) |
2014-04-01 – 2018-03-31
|
Project Status |
Completed (Fiscal Year 2017)
|
Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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Keywords | 開水路流れ / 準三次元解析 / 粗面抵抗則 / 多重スケール / 跳水 / 礫床河川 / 非平衡流砂 / 二相流 / 非平衡粗面抵抗則 / 一般底面流速解析法 / 跳水形態 / 段波 / 河床変動 / 急拡 / 非静水圧準三次元モデル / 渦層 / 粗度層 / 浮遊砂 / 掃流砂 / 底面流速解析法 / 底面勾配 / 湾曲 / 非静水圧分布 / 水深積分モデル / 多重スケール性 / 境界層 |
Outline of Final Research Achievements |
This study proposed a new calculation method, GBVC4-DWL, which was developed by coupling General Bottom Velocity Computation (GBVC) method with Dynamic Wall Law to calculate three dimensional flow structures and complex bottom velocity fields in open channel flows in the frame work of two dimensional computation method. The dynamic wall law allows us to calculate bottom velocity dynamically based on continuity and momentum equations for bottom thin layers of vortex and roughness layers without assuming equilibrium flow condition, such as log law velocity distribution, for the bottom boundary condition for the computation of three dimensional flows. The method has been validated though the comparison with experimental data not only for three dimensional flow structures with multi-scale toughness, but also for bed variation analysis.
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Report
(5 results)
Research Products
(24 results)