Turbulent Diffusion from a Patchy Surface into the Boundary Layer

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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 usefu1 when we consider the at mospheric boundary layer over a patchy surface.

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  • 気象集誌. 第2輯

    気象集誌. 第2輯 83 (3), 409-415, 2005

    公益社団法人 日本気象学会

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