Discussion
Looping plume behaviour is characteristic of
Answer: C
Correct answer: Strongly unstable conditions
Looping is the plume of a strongly unstable, superadiabatic atmosphere. Large convective eddies of a scale comparable with the plume itself carry whole sections of it up and down, so the plume traces a wavy, looping path downwind.
Dilution overall is rapid, but the loops can bring undiluted plume to the ground close to the stack, producing brief high concentrations there. Neutral conditions give the smooth cone of coning, and strongly stable conditions the flat horizontal ribbon of fanning.
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