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     For a technical description of the ISC dry deposition algorithms, refer to Sections 1.3 and 2.3 of Volume II of the User's Guide. 

 3.3.7 Specifying Variables for Precipitation Scavenging and Wet Deposition Calculations

     The ISC Short Term (ISCST) model also includes algorithms to handle the scavenging and removal by wet deposition (i.e., precipitation scavenging) of gases and particulates.  For wet deposition of particulates, the user must input the source particle variables controlled by the PARTDIAM, MASSFRAX, and PARTDENS keywords on the SO pathway.  As with building dimensions and variable emission rate factors described above, the scavenging coefficients may be input for a single source, or may be applied to a range of sources.  A separate scavenging coefficient is input for liquid precipitation and for frozen precipitation.

     For particulates, the scavenging coefficients are input through the PARTSLIQ and PARTSICE keywords for liquid and frozen precipitation, respectively.  The syntax, type and order for these two keywords are summarized below:

Syntax:

SO PARTSLIQ  Srcid (or Srcrng) Scavcoef(i),i=1,Npd

SO PARTSICE  Srcid (or Srcrng) Scavcoef(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 Scavcoef array consists of the scavenging coefficients (s-mm/hr)-1 for each of the particle size categories defined on the SO PARTDIAM card (up to a maximum of 20 set by the NPDMAX PARAMETER in the computer code).

 

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

 

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