Skip Navigational linksEAST Lab -  University of Michigan
Site Map  | Links | Acknowledgements 
DFE World: Design & the Global Environment
Photograph of Nature
|
|
 Air Pollution
|
|
|
 Exercises


Atmospheric Stability
Dispersion Coefficients
Coordinate System
Central Campus Map
CALINE 4
Model Output

 

Central Campus Air Quality Model (CCAQM) Instructions

 

Line Sources

Line source models are a way to represent a steady stream of vehicles traveling along a road.  The line source model used in this tutorial is a Gaussian distribution, which is a statistical representation of the dispersion of emissions from the road in a given space.


 

 

 

 

 

Model Inputs
The Gaussian distribution of a line source is given by the following equation:

 

Where:

  • C(x) = concentration at ground level at point (x,y) in units g/m3

  • q = emission rate per distance, g/mile

  • u = wind speed, m/s

  • σz = vertical dispersion coefficient, m