ISSN:
1420-9136
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Summary An investigation of the effect of sinusoidal vertical motion on turbulent diffusion is made. The diffusion models analyzed are i) without vertical motion, ii) with a simple sinusoidal vertical motion of constant amplitude, iii) with a sinusoidal vertical motion of damping amplitude. It is found from this investigation that the presence of undulations in vertical velocity has significantly enhanced the dispersion of pollution. Comparison of effective diffusivity shows an increase by a factor of 3.9 where no damping of undulations occurred, and by a factor of 2.8 where we have a damping of the undulations below the level of the source. This increase in dispersion can largely be explaied by the fact that the undulations have created a dilution in concentration because of the vertical motion and a configuration in which horizontal diffusivity is allowed to have an effect in pulling pollutant away from the axis of maximum concentration. The damping of undulations below the level of the source serves to suppress this configuration which in turn reduces dispersion below the source, an obviously favorable antipollution configuration.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01592935
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