The Vertical Term is given by Equation (1‑50) or Equation (1‑54) with the effective emission height, he, being the physical release height assigned by the user. In general, he should be set equal to the physical height of the source of emissions above local terrain height. For example, the emission height he of a slag dump is the physical height of the slag dump.
Since the ISCST algorithm estimates the integral over the area upwind of the receptor location, receptors may be located within the area itself, downwind of the area, or adjacent to the area. However, since σz goes to 0 as the downwind distance goes to 0 (see Section 18.104.22.168), the plume function is infinite for a downwind receptor distance of 0. To avoid this singularity in evaluating the plume function, the model arbitrarily sets the plume function to 0 when the receptor distance is less than 1 meter. As a result, the area source algorithm will not provide reliable results for receptors located within or adjacent to very small areas, with dimensions on the order of a few meters across. In these cases, the receptor should be placed at least 1 meter outside of the area.
In Equation (1-65), the integral in the lateral (i.e., crosswind or y) direction is solved analytically as follows:
where erfc is the complementary error function.
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APLICACIONES castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD