2021 Fiscal Year Final Research Report
Study on longshore sediment transport based on circular wave basin and development of its direct simulation method
| Project/Area Number |
19H02247
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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 | Nagoya University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
中村 友昭 名古屋大学, 工学研究科, 准教授 (90569328)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 円形造波水槽 / 沿岸流 / 沿岸漂砂 / 海浜地形変化 / 海岸侵食 / 数値波動水槽 / UAV |
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| Outline of Final Research Achievements |
Hydraulic model experiments have been conducted using spiral wave maker and circular wave tank to investigate generation mechanism of longshore sediment transport. In the initial stage, on-offshore sediment transport is developed to form the equilibrium beach profile. Then, the longshore sediment transport is developed by the longshore current which is caused by spacial gradient of the mean water level after wave breaking. This phenomena is confirmed by the behavior of fluoressent sand in the experiments. Flow field is investigated not only in the experiment but also the three-dimensional simulation developed by the present research. In the numerical simulation method, full nonlinear wave field in the circular wave tank and spiral wave maker is simulated.
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| Free Research Field |
海岸工学
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| Academic Significance and Societal Importance of the Research Achievements |
これまで平面水槽を使った水理実験や現地観測でしか観測できなかった沿岸漂砂について，不透過な側壁の影響を受けることなく，定常的な波を対象に検討することが本研究によって可能となった．特に，沿岸漂砂の生成・発達機構を波動場の特性と関連付けて明らかにしたことは学術的に極めて大きな意義を有する．海岸侵食の問題は地球規模で問題となっている現象であり，様々な対応策がとられてきているが，長期的には十分解決には至っていない．本研究により海岸侵食に特に大きな寄与をしている沿岸漂砂の発生機構が示されたことにより，それを抑えるための有効な工法の確立につながり，海岸侵食の軽減とともに沿岸防災にも大きく資するものである．
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