Discussion
In the Gaussian plume model, the concentration distribution across and above the plume centreline is assumed to be
Answer: A
Correct answer: Normal, with standard deviations growing
The Gaussian plume model assumes the concentration is normally distributed about the plume centreline in both the crosswind and the vertical directions. The standard deviations \( \sigma_y \) and \( \sigma_z \) grow with downwind distance as turbulence spreads the plume, and their values are read from curves selected by the Pasquill stability class.
The assumption follows from treating turbulent spreading as the sum of many independent random displacements. It is what gives the model its familiar form, with the peak on the centreline and the concentration falling off symmetrically to either side, rather than being uniform, triangular, or decaying only with distance from the source.
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