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Algorithms IX software environmental science and health

                 

DISPER: 16 air quality management 17 air quality guidelines 18  outdoor air pollution 19 air pollution cause 20 environmental science 21 environmental monitoring 22 environmental impact assessment 23 indoor air quality 24 environmental assesment 25 air monitoring 26 modelling emissions 27 software pollution 28 environmental engineering 29 atmospheric pollution 30 air pollution  31 environmental maps

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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.