Discussion
Which shape does a Gaussian plume model assume for the concentration?
Answer: D
The model assumes the concentration is normally distributed about the plume centreline in both the crosswind and the vertical, with standard deviations that grow with downwind distance. Reflection at the ground and at the mixing height is handled by image sources. Real plumes are skewed in convective conditions, which is a recognised limitation the newer models address. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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