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3.3.2.4 OPENPIT Source Input 

     The ISC OPENPIT source algorithms are used to model particulate emissions from open pits, such as surface coal mines and rock quarries.  The OPENPIT algorithm uses an effective area for modeling pit emissions, based on meteorological conditions, and then utilizes the numerical integration area source algorithm to model the impact of emissions from the effective area sources.  The ISC models accept rectangular pits with an optional rotation angle specified relative to a north-south orientation.  The rotation angle is specified relative to the vertex used to define the source location on the SO LOCATION card (e.g., the southwest corner).  The syntax, type and order for the SRCPARAM card for OPENPIT sources are summarized below:

Syntax:

SO SRCPARAM  Srcid Opemis Relhgt Xinit Yinit Pitvol (Angle)

Type:

Mandatory, Repeatable

Order:

Must follow the LOCATION card for each source input

where the Srcid parameter is the same source ID that was entered on the LOCATION card for a particular source, and the other parameters are as follows:

Opemis  ‑    open pit emission rate in g/(s-m2),

Relhgt  ‑    average release height above the base of the pit in meters,

Xinit   ‑    length of X side of the open pit (in the east-west direction if Angle is 0 degrees) in meters,

Yinit   ‑    length of Y side of the open pit (in the north-south direction if Angle is 0 degrees) in meters,

Pitvol  ‑    volume of open pit in cubic meters, and

Angle   -    orientation angle for the rectangular open pit in degrees from North, measured positive in the clockwise direction (optional).

The same emission rate is used for both concentration and deposition calculations in the ISC models.  It should also be noted that the emission rate for the open pit source is an emission rate per unit area, which is different from the point and volume source emission rates, which are total emissions for the source.  The Relhgt parameter cannot exceed the effective depth of the pit, which is calculated by the model based on the length, width and volume of the pit.  A Relhgt of 0.0 indicates emissions that are released from the base of the pit. 

 

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