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 (Equation 1-1), and in the plume rise formulas described in Section 1.1.4. The power law equation is of the form:
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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