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3.5.8 Specifying Wind Profile Exponents

 

     While the model uses default wind profile exponents if the regulatory default option is selected (see the CO MODELOPT description in Section 3.2.2), for non‑regulatory default applications the user can specify wind profile exponents through use of the WINDPROF keyword on the ME pathway.  The syntax and type of this keyword are summarized below:

 

Syntax:

ME WINDPROF  Stab  Prof1 Prof2 Prof3 Prof4 Prof5 Prof6

Type:

Optional, Repeatable

 

where the Stab parameter specifies the stability category for the following six values, and Prof1 through Prof6 are the wind profile exponents for each of the six wind speed categories. The Stab parameter may be input either alphabetically (A through F) or numerically (1 for A through 6 for F).  The WINDPROF cards do not need to be input in any particular order.

 

     The wind speed categories are either the default categories used by the model (with upper bound speeds of 1.54, 3.09, 5.14, 8.23, and 10.8 m/s for the first five categories ‑ the sixth category is assumed to have no upper bound), or the categories specified by the user on the optional ME WINDCATS keyword (Section 3.5.6).

 

     The following example will input the default exponents for the rural mode, and illustrates the use of a repeat value for applying the exponents to all six wind speed categories:

 

ME WINDPROF  A  6*0.07

ME WINDPROF  B  6*0.07

ME WINDPROF  C  6*0.10

ME WINDPROF  D  6*0.15

ME WINDPROF  E  6*0.35

ME WINDPROF  F  6*0.55

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If the regulatory default option has been selected, then any inputs on the WINDPROF keyword are ignored by the model, and a non‑fatal warning message is generated.

 

 

 

 

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