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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.
software · environmental science and health
DISPER software solutions: This application has been used in great number of environmental reports, air pollution courses and air pollution studies in the last years. We currently have users in more than 10 countries.
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