2.1.5.3

Procedures Used to Account for the Effects ofBuilding 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 forBuoyancy‑Induced Dispersion.See the discussion given in Section 1.1.5.4.

2.1.6

The Vertical Term2.1.6.1

TheVertical 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 z

_{i}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 σ

_{z}/z_{i}ratio is greater than or equal to 1.6. Additionally, the ground‑level concentration is set equal to zero if the effective stack height h_{e}exceeds the mixing height z_{i}. As explained in Section 1.1.6.1, the ISC model currently assumes unlimited mixing for the E and F stability categories.2.1.6.2

TheVertical Term inElevated Terrain.See the discussion given in Section 1.1.6.2.

2.1.6.3

TheVertical Term for Large Particulates.Section 1.1.6.3 discusses the differences in the dispersion of large particulates and the dispersion of gases and small particulates and provides the guidance on the use of this option. The Vertical Term for large particulates is given by Equation (1‑53).

2.1.7

The Decay TermSee the discussion given in Section 1.1.7.

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APLICACIONES castellano: DIS CUS DES RAD english: DIS CUS DES RAD

português: DIS CUS DES RAD italiano: DIS CUS DES RAD