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3.5.6 Correcting Wind Direction Alignment Problems

 

     The WDROTATE keyword allows the user to correct the input meteorological data for wind direction alignment problems.  All input wind directions or flow vectors are rotated by a user‑specified amount.  Since the model results at particular receptor locations are often quite sensitive to the transport wind direction, this optional keyword should be used only with  extreme caution and with clear justification.

 

     The syntax and type of this keyword are summarized below:

 

Syntax:

ME WDROTATE  Rotang

Type:

Optional, Non‑repeatable

 

where the Rotang parameter specifies the angle in degrees to rotate the input wind direction measurements.  The value of Rotang is subtracted from the wind direction measurements.  It may be used to correct for known (and documented) calibration errors, or to adjust for the alignment of a valley if the meteorological station is located in a valley with a different alignment than the source location.  Since the Short Term models use the flow vector (direction toward which the wind is blowing) as the basic input, the WDROTATE keyword may also be used to convert input data as wind direction (from which the wind is blowing) to flow vector by setting the parameter Rotang = 180.

 

3.5.7 Specifying Wind Speed Categories

 

     Some of the parameters that may be input to the models are allowed to vary by wind speed category.  Examples of such inputs are user‑specified wind speed profile exponents, vertical potential temperature gradients, and variable emission rate factors.  The models use six wind speed categories, and these are defined by the upper bound wind speed for the first five categories (the sixth category is assumed to have no upper bound).  The default values for the wind speed categories are as follows:  1.54, 3.09, 5.14, 8.23, and 10.8 m/s.  The syntax and type of the WINDCATS keyword, which may be used to specify different category boundaries, are summarized below:

 

Syntax:

ME WINDCATS  Ws1  Ws2  Ws3  Ws4  Ws5

Type:

Optional, Non‑repeatable

 

where the Ws1 through Ws5 parameters are the upper bound wind speeds of the first through fifth categories in meters per second.  The upper bound values are inclusive, i.e., a wind speed equal to the value of Ws1 will be placed in the first wind speed category.

 

 

 

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