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Three of the following are classical plume types. Which is a mechanism rather than a type?

Building downwash

Coning

Fanning

Lofting

  • A.Lofting
  • B.Building downwash
  • C.Coning
  • D.Fanning

Answer: B

Correct answer: Building downwash

The classical plume types - looping, coning, fanning, lofting, fumigation and trapping - are named for the stability profile in which they occur. Building downwash is not one of them: it is an aerodynamic effect of an obstacle in the flow, and it can happen in any stability class.

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