Abstract
The semi-Lagrangian approach developed previously by this author is used to describe diffusion from ground-level line and point sources in stable and unstable boundary layers. In this approach, the velocity and the turbulent diffusivity are taken to be constant in the vertical direction but variable in the horizontal direction, making it possible to obtain algebraic relations for the distribution of concentration in terms of the vertical spread, roughness height, friction velocity and Monin-Obukhov length scale, with a separate equation relating vertical spread to the streamwise coordinate. Reasonable agreement of the calculated results with two sets of laboratory data and also with field data obtained in previous experiments by other workers is found.
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