2022 Fiscal Year Final Research Report
PIV observations and the lattice Boltzmann simulations of turbulent transport in a plant canopy under stably-stratified atmospheric conditions
| Project/Area Number |
20K04057
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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 17020:Atmospheric and hydrospheric sciences-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
下山 宏 北海道大学, 低温科学研究所, 助教 (50391115)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 乱流輸送 / 植物群落 / PIV観測 / 格子ボルツマン法 / 大気安定度 |
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| Outline of Final Research Achievements |
We constructed a PIV observation system to realize direct observations of the spatial structure of coherent turbulence within plant canopies. Using the developed system, we obtained basic data for elucidating the dependency of turbulence structure on the atmospheric stability. A numerical simulation model was constructed to reproduce the turbulent flow field in plant canopies based on the lattice Boltzmann method. Through numerical analysis, we elucidated the spatio-temporal structure of large-scale turbulence that governs the transport of scalar quantities (heat, water vapor, and CO2, etc.) within plant canopies, and the involvement of pressure fluctuations in the mechanism of spatio-temporal variation of turbulence structure in plant canopies.
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| Free Research Field |
境界層気象学
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| Academic Significance and Societal Importance of the Research Achievements |
森林群落内での流れの可視化観測を実現することで、従来の乱流観測手法では得ることができなかった、夜間（安定成層条件）の森林群落内の乱流の空間構造を直接観測した。また、これまで計測の困難さから観測例が非常に限られていた、森林内で生じる気圧の微小変動を観測し、森林群落内の乱流が時空間的に変動する過程における気圧変動の役割を明らかにした。さらに、従来とは異なる新たな計算手法により、森林群落内の乱流を忠実に再現するシミュレーションモデルを開発し、群落内での熱や物質の輸送を支配する乱流の時空間構造を明らかにした。
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