Canarina Environmental Software

Canarina DISPER software · Pb air dispersion · algorithms 17

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Canarina DISPER software · Pb air dispersion

 

9.1.7 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.

 

 

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Canarina DISPER software · Pb air dispersion 

It is interesting for environmental consulting, storage tanks, underground storage tanks, underground storage, lead in paint, air dispersion, soil contamination

 

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