1.5.1 The Gaussian Sector Average Equation

 

     The Short Term complex terrain screening algorithm for stacks uses the steady‑state, sector-averaged Gaussian plume equation for a continuous elevated source.  As with the simple terrain algorithm described in Section 1.1, the origin of the source's coordinate system is placed at the ground surface at the base of the stack for each source and each hour.  The x axis is positive in the downwind direction, the y axis is crosswind (normal) to the x axis and the z axis extends vertically.  The fixed receptor locations are converted to each source's coordinate system for each hourly concentration calculation.  Since the concentrations are uniform across a 22.5 degree sector, the complex terrain algorithms use the radial distance between source and receptor instead of downwind distance.  The calculation of the downwind, crosswind and radial distances is described in Section 1.5.2.  The hourly concentrations calculated for each source at each receptor are summed to obtain the total concentration produced at each receptor by the combined source emissions.

 

 

 

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