Types of Models. Marti Blad PhD PE. EPA Definitions. Dispersion Models : Estimate pollutants at ground level receptors Photochemical Models : Estimate regional air quality, predicts chemical reactions
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Marti Blad PhD PE
Dh = plume rise
h = stack height
H = effective stack
H = h + Dh
C(x,y,z) Downwind at (x,y,z) ?
c(x,y,z) = contaminant concentration at the specified coordinate [ML-3], x = downwind distance [L], y = crosswind distance [L], z = vertical distance above ground [L], Q = contaminant emission rate [MT-1], sy = lateral dispersion coefficient function [L], sz = vertical dispersion coefficient function [L], u = wind velocity in downwind direction [L T-1], H = effective stack height [L].
AKA Plume in Grid
Figure from http://irina.colorado.edu/lectures/Lec29.htm
Variable is Time: t
Variable is Time and height: t, y
Variable is Time, height and length distance:
t, x, y
t, x, y, z
Depth of boxes discussed under meteorology
From “INTERNATIONAL AIR QUALITY ADVISORY BOARD 1997-1999 PRIORITIES REPORT, the HYSPLIT Model” (http://www.ijc.org/boards/iaqab/pr9799/project.html)