3.4.3 Specifying Discrete Receptor Locations

     In addition to the receptor networks defined by the GRIDCART and GRIDPOLR keywords described above, the user may also specify discrete receptor points for modeling impacts at specific locations of interest.  This may be used to model critical receptors, such as the locations of schools or houses,  nearby Class I areas, or locations identified as having high concentrations by previous modeling analyses.  The discrete receptors may be input as either Cartesian x,y points (DISCCART keyword) or as polar distance and direction coordinates (DISCPOLR keyword).  Both types of receptors may be identified in a single run.  In addition, for discrete polar receptor points the user specifies the source whose location is used as the origin for the receptor.


     A special option has been included in the ISC models, controlled by the BOUNDARY keyword, which simplifies the input of plant boundary distances in a polar framework.  This option is described in Section 3.4.4 below. Discrete Cartesian Receptors.


     Discrete Cartesian receptors are defined by use of the DISCCART keyword.  The syntax and type of this keyword are summarized below:



RE DISCCART  Xcoord  Ycoord  (Zelev)  (Zflag)


Optional, Repeatable


where the Xcoord and Ycoord parameters are the x‑coordinate and y‑coordinate (m), respectively, for the receptor location.  The Zelev parameter is an optional terrain elevation (m) for the receptor for use in elevated terrain modeling.  The Zflag parameter is the optional receptor height above ground (m) for modeling flagpole receptors.  All of the parameters are in units of meters, except for Zelev, which defaults to meters but may be specified in feet by use of the RE ELEVUNIT or CO ELEVUNIT keyword.


     If neither the elevated terrain option (Section 3.2.6) nor the flagpole receptor height option (Section 3.2.7) are used, then the optional parameters are ignored if present.  If only the elevated terrain height option is used (no flagpoles), then the third parameter (the field after the Ycoord) is read as the Zelev parameter.  If only the flagpole receptor height option is used (no elevated terrain), then the third parameter is read as the Zflag parameter.  If both options are used, then the parameters are read in the order indicated for the syntax above.  If the optional parameters are left blank, then default values will be used.  The default value for Zelev is 0.0, and the default value for Zflag is defined by the CO FLAGPOLE card (see Section 3.2.7).  Note:  If both the elevated terrain and flagpole receptor height options are used, then the third parameter will always be used as Zelev, and it is not possible to use a default value for Zelev while entering a specific value for the Zflag parameter.





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


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