2.1.5.3 Procedures Used to Account for the Effects of Building Wakes on Effluent Dispersion.

 

     With the exception of the equations used to calculate the lateral virtual distance, the procedures used to account for the effects of building wake effects on effluent dispersion are the same as those outlined in Section 1.1.5.3 for the short‑term model.  The calculation of lateral virtual distances by the long‑term model is discussed in Section 2.1.5.2 above.

 

 

2.1.5.4 Procedures Used to Account for Buoyancy‑Induced Dispersion.

 

     See the discussion given in Section 1.1.5.4.

 

 

2.1.6 The Vertical Term

 

2.1.6.1 The Vertical Term for Gases and Small Particulates.

 

     Except for the use of seasons and discrete categories of wind‑speed and stability, the Vertical Term for gases and small particulates corresponds to the short term version discussed in Section 1.1.6.  The user may assign a separate mixing height zi to each combination of wind‑speed and stability category for each season.

 

     As with the Short‑Term model, the Vertical Term is changed to the form:

 

 

at downwind distances where the σz/zi ratio is greater than or equal to 1.6.  Additionally, the ground‑level concentration is set equal to zero if the effective stack height he exceeds the mixing height zi.  As explained in Section 1.1.6.1, the ISC model currently assumes unlimited mixing for the E and F stability categories.

 

 

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