نمذجة انتشار الملوثات

Abstract

This paper was deal with the study and analysis the effect of some effective meteorological elements on pollutants concentration by using Gaussian diffusion theory, matlab program was used to make the relevant computation.In this paper were showed the relationship between the pollutants concentration and selected surface wind velocity after matched it with atmospheric stability type according to Pasqual classification, as well study the effect of the effective height of pollution source( in the paper select a stack as pollution source) at pollutants concentration in addition to the effect of the source's site on pollutants concentration value.The results showed that the received pollutants concentration at 1000m horizontal distance were inversely proportion with wind velocity in instability condition wherein the convection current and eddies act to be lessen the pollutants concentration near the surrounding areas from pollution source especially at daytime.As to the changing of effective height of pollution source it found that when the source's height was increasing lead to decreasing the received pollutants concentration at horizontal distance from the source, and it showed the pollutants concentration gradual decreasing with going far towards (y) that is from the central line of pollutants diffusing , while in the direct (z) it's not necessary the increasing in height from central line giving the same intensity of decreasing pollutants concentration especially at instability condition as to the higher pollutants concentration was at 50m height at stability condition that is in the effective height of pollution source.