2012 Fiscal Year Final Research Report
Gas exchange and turbulent transport in vegetated open-channel flows
| Project/Area Number |
23760458
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Hydraulic engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
SANJOU Michio 京都大学, 大学院・工学研究科, 准教授 (80362458)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 開水路流れ / ガス輸送 / 植生流れ |
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| Research Abstract |
We conducted turbulence and DO measurements in laboratory flume, in which two kinds of bed conditions were chosen, i.e., smooth and vegetation roughness conditions. It was found that the vegetation promotes the gas transfer beneath air / water interface, because a larger surface velocity divergence is induced by a large - scale shear vortex formed in the vegetation edge. Further, we revealed a great dependency of the gas transfer on the vegetation density. Based on the measured results, a new surface divergence model was developed which can predict successfully the gas transfer velocity in the open-channel flows for the both of the smooth and vegetated bed conditions.
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