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3.3.6 Specifying Variables for Settling, Removal and Deposition Calculations

     The ISC models include algorithms to handle the gravitational settling and removal by dry deposition of particulates.  The input of source variables for settling and removal are controlled by three keywords on the SO pathway, PARTDIAM, MASSFRAX, and PARTDENS.  As with building dimensions and variable emission rate factors described above, the settling and removal variables may be input for a single source, or may be applied to a range of sources.

     The syntax, type and order for these three keywords are summarized below:

Syntax:

SO PARTDIAM  Srcid (or Srcrng) Pdiam(i),i=1,Npd

SO MASSFRAX  Srcid (or Srcrng) Phi(i),i=1,Npd

SO PARTDENS  Srcid (or Srcrng) Pdens(i),i=1,Npd

Type:

Optional, Repeatable

Order:

Must follow the LOCATION card for each source input

where the Srcid or Srcrng identify the source or sources for which the inputs apply, and where the Pdiam array consists of the particle diameter (microns) for each of the particle size categories (up to a maximum of 20 set by the NPDMAX PARAMETER in the computer code), the Phi array is the corresponding mass fractions (between 0 and 1) for each of the categories, and the Pdens array is the corresponding particle density (g/cm3)

for each of the categories.  The use of the Srcrng parameter is explained in more detail in Section 3.3.3 above for the BUILDHGT keyword.

     The number of categories for a particular source is Npd. The user does not explicitly tell the model the number of categories being input, but if continuation cards are used all inputs of a keyword for a particular source or source range must be contiguous, and the number of categories must agree for each of the three keywords input for a particular source.  As many continuation cards as needed may be used to define the inputs for a particular keyword.  The model checks the inputs to ensure that the mass fractions sum to 1.0 (within 2 percent) for each source input, and that the mass fractions are within the proper range (between 0 and 1).

 

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

 

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