Canarina Environmental Software

Canarina DISPER Software · indoor air quality dispersion · algorithms 8

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Canarina DISPER Software · indoor air quality dispersion

 

9.1.3 Wind Speed Profile 

The wind power law is used to adjust the observed wind speed, uref, from a reference measurement height, zref, to the stack or release height, hs. The stack height wind speed, us, is used in the Gaussian plume equation. The power law equation is of the form:

 

us=uref(hs/zref)p     (4)

 

where p is the wind profile exponent. Values of p may be provided by the user as a function of stability category and wind speed class. Default values are as follows:

Stability Category

Rural Exponent

Urban Exponent

A

0.07

0.15

B

0.07

0.15

C

0.10

0.20

D

0.15

0.25

E

0.35

0.30

F

0.55

0.30

The stack height wind speed, us, is not allowed to be less than 1.0 m/s.

 

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Canarina DISPER Software · indoor air quality dispersion

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