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Which siting consideration follows for a coastal power station?

  • A.The stack should be positioned as close to the shoreline as possible so that the plume is carried out to sea
  • B.The stack must be tall enough to avoid the growing internal layer
  • C.The stack should be as short as possible so that the plume is released into the well mixed marine layer below
  • D.Siting is unaffected

Answer: B

A stack whose plume is intercepted by the internal boundary layer a few kilometres inland will fumigate the ground there, so the release height must be chosen with the expected growth of that layer in mind. Detailed modelling of the coastal transition is standard for such sites. A short stack would release directly into the layer and give high concentrations immediately. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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