english:

 

 

                                 

 

 

     The regulatory default options are identified in Appendix A of the Guideline on Air Quality Models (Revised) (EPA, 1987b), and include the following:

·    Use stack‑tip downwash (except for Schulman‑Scire downwash);

·    Use buoyancy‑induced dispersion (except for Schulman‑Scire downwash);

·    Do not use gradual plume rise (except for building downwash);

·    Use the calms processing routines;

·    Use upper‑bound concentration estimates for sources influenced by building downwash from super‑squat buildings;

·    Use default wind speed profile exponents; and

·    Use default vertical potential temperature gradients.

Other model options, such as complex terrain, are not affected by the regulatory default options.

     The default wind profile exponents and vertical potential temperature gradients are provided below:

Pasquill

Stability

Category

  Rural

   Wind

Profile

Exponent

  Urban

   Wind

Profile

Exponent

    Rural

Temperature

  Gradient

    (K/m)

     Urban

  Temperature

   Gradient

     (K/m)

     A

   0.07

   0.15

     0.0

      0.0

     B

   0.07

   0.15

     0.0

      0.0

     C

   0.10

   0.20

     0.0

      0.0

     D

   0.15

   0.25

     0.0

      0.0

     E

   0.35

   0.30

    0.020

     0.020

     F

   0.55

   0.30

    0.035

     0.035

 

 

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