WindShearExponent:

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   Wind shear exponent

   Type WindShearExponent for a demo.
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   Form:
   alpha = WindShearExponent( type )
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   ------
   Inputs
   ------
   type       (1,:)  Type of surface

   -------
   Outputs
   -------
   alpha      (1,1)  Wind shear exponent

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   Reference: Wind ? New Zealand?s Energy 
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