In: Civil Engineering
X -value is taken as the downwind distance from stack at (0,0,0) to the point at which we want to calculate the concentration..It is given in the figure shown above.
This is the guassian dispersion equation
For maximum downwid concentration ,y value = 0,because the
pollutant concentraion is maximum along the plume centreline
The variables
z &
y
are function of X thats how the X distance downwind is incorporated
in the guasssian equation.
the value of
z &
y
are taken from pasquil curve
this
implies x- distance is taken for the downwind pollutant
concentration using guassian plume model