The terms in Equation (2‑1) correspond to the terms discussed in Section 1.1 for the short‑term model except that the parameters are defined for discrete categories of wind‑speed, wind‑direction, stability and season.  The various terms are briefly discussed in the following subsections.  In addition to point source emissions, the ISC long‑term concentration model considers emissions from volume and area sources.  These model options are discussed in Section 2.2.  The optional algorithms for calculating dry deposition are discussed in Section 2.3.

 

 

2.1.2 Downwind and Crosswind Distances

 

     See the discussion given in Section 1.1.2.

 

 

2.1.3 Wind Speed Profile

 

     See the discussion given in Section 1.1.3.

 

 

2.1.4 Plume Rise Formulas

 

     See the discussion given in Section 1.1.4.

 

 

2.1.5 The Dispersion Parameters

 

 

2.1.5.1 Point Source Dispersion Parameters.

 

     See Section 1.1.5.1 for a discussion of the procedures use to calculate the standard deviation of the vertical concentration distribution σz for point sources (sources without initial dimensions).  Since the long term model assumes a uniform lateral distribution across the sector width, the model does not use the standard deviation of the lateral dispersion, σy (except for use with the Schulman‑Scire plume rise formulas described in Section 1.1.4.11).

 

 

 

 

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