2022 Fiscal Year Final Research Report
Development of a drag force model based on the flow obstruction rate - A feasible and low-load tsunami inundation analysis in urban areas -.
| Project/Area Number |
18K04670
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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 25030:Disaster prevention engineering-related
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| Research Institution | Osaka Sangyo University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
小笠原 敏記 岩手大学, 理工学部, 教授 (60374865)
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| Project Period (FY) |
2018-04-01 – 2023-03-31
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| Keywords | 津波 / 底面せん断応力 / 街区 / 粗度係数 / 運動量損失 |
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| Outline of Final Research Achievements |
The objective of this study is to develop a drag force model to replace the conventional model using Manning's roughness coefficient in order to duplicate tsunami flows into urban areas with high accuracy in numerical simulations. The gradient of the vertical profile of the horizontal mean velocity of the flows was obtained using PIV measurements. The bottom friction force was then estimated. By fitting the measured values to the two-dimensional momentum equation, the bottom frictional force was estimated to be approximately correct. Furthermore, the PIV measurements of the flow over the girder revealed the need to model the momentum loss associated with vertical flow.
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| Free Research Field |
水工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，非定常流れのせん断応力の直接測定を試み，様々な計測機器を構築する中で概ね正しい値を得られたことは，今後，より複雑な実験条件における抵抗力を計測する上での基準となり大きな前進である．また，研究を進めることによって市街地における建物の影響をこれまでの底面摩擦係数に置き換えるだけでなく，運動量の損失項を導入することで合理的に評価することができ，それによってハザードマップの再評価が可能になるほか，道路などの空間に流れが集中する現象などを再現することができ，より安全な避難経路の誘導が可能になる．
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