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Algorithms IX · software · environmental science and health
The Decay Term (D)
The Decay Term is a simple method of accounting for pollutant removal by physical or chemical processes. It is of the form:
D=exp(-psi x/us) for psi > 0 (36)
D=0 for psi = 0 (37)
where:
psi= the decay coefficient (s-1) (a value of zero means decay is not considered)
x= downwind distance (m)
For example, if T1/2 is the pollutant half life in seconds, the user can obtain y from the relationship:
psi=0.693/T1/2 (38)
The default value for psi is zero. That is, decay is not considered in the model calculations unless y is specified. However, a decay half life of 4 hours (y = 0.0000481 s-1) corresponds to SO2 when modeled.
environmental science and health
Environmental science and health: DISPER software is an important tool for environmental studies and gas dispersion modeling. Pollution maps can be easily obtained.
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