ISSN:
1420-9136
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Summary A two-dimensional diffusion model in the vertical plane is considered as an unsteady boundary value problem which is solved by applying Laplace transformation and finding Green's function. The effects of the surface (ground) absorption (measured by β) and the terminal velocity (w) present an alternative explanation other than considering the variable eddy diffusivities and the change of the wind with height. It is shown that the effect of the surface absorption acts opposite to the effect of the terminal velocity for the diffusion of a source placed at the surface. The former alone reduces the concentration with the distance in the downwind direction at a faster rate than the latter alone. The path of the plume is considered only for the casew=2 β. The effects of suchw and β only slightly modify the path of the plume without such effects. If the height of the source is short, say 20 m, the modification of the path of the plume is insignificant compared to that of the case with the source placed at the surface.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00876002
