Turbulent Diffusion from a Patchy Surface into the Boundary Layer
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- Mouri Hideaki MOURI Hideaki
- Meteorological Research Institute
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- Haginoya Shigenori HAGINOYA Shigenori
- Meteorological Research Institute
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- Kurihara Kazuo [他] KURIHARA Kazuo
- Meteorological Research Institute
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- HORI Akihiro
- Meteorological and Environmental Service, Inc.
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- KAWASHIMA Yoshihide
- Meteorological and Environmental Service, Inc.
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Author(s)
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- Mouri Hideaki MOURI Hideaki
- Meteorological Research Institute
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- Haginoya Shigenori HAGINOYA Shigenori
- Meteorological Research Institute
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- Kurihara Kazuo [他] KURIHARA Kazuo
- Meteorological Research Institute
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- HORI Akihiro
- Meteorological and Environmental Service, Inc.
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- KAWASHIMA Yoshihide
- Meteorological and Environmental Service, Inc.
Abstract
Turbulent diffusion from a small surface source into the boundary layer is studied by means of a wind-tunnel experiment. On the tunnel floor, a strip-shaped heater was placed perpendicularly to the mean flow. We regarded the heat as a passive scalar, and measured the air temperature in the boundary layer over the tunnel floor. The passive scalar, advected on the mean flow, diffuses in the floor-normal direction. For the diffusion of the passive scalar throughout the boundary layer, we find a characteristic length scale in the mean-flow direction. This length scale, which is always twice the boundary-layer thickness regardless of the other experimental parameters, would be useful when we consider the atmospheric boundary layer over a patchy surface.
Journal
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- Journal of the Meteorological Society of Japan
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Journal of the Meteorological Society of Japan 83(3), 409-415, 2005-06-24
Meteorogical Society of Japan
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