Relationship between surface velocity divergence and gas transfer in open-channel flows with submerged simulated vegetation
Abstract
Velocity and gas concentration measurements were carried out to reveal gas transfer phenomena in open-channel turbulent flows with flat bottom and submerged vegetation bottom conditions. A large-scale coherent vortex appears near the vegetation top due to shear instability, and the submerged vegetation was found to promote gas transfer beneath the air- water interface. Furthermore, we revealed a great dependency of gas transfer on vegetation density. The present measurement results propose a new surface divergence model with wide generality, connecting reasonably the gas transfer velocity and the surface divergence intensity in open-channel flows, irrespective of bottom roughness conditions.
- Publication:
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IOP Conference Series: Earth and Environmental Science
- Pub Date:
- May 2016
- DOI:
- 10.1088/1755-1315/35/1/012016
- Bibcode:
- 2016E&ES...35a2016S