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The wind profile power law relationship is often used as a substitute for the log wind profile when surface roughness or stability information is not available. The wind profile power law relationship is: u/ur = (z/zr)
The wind profile power law relationship is: u/ur = (z/zr) where u is the wind speed (in meters per second) at height z (in meters), and ur is the known wind speed at a reference height zr. The exponent (?) is an empirically derived coefficient that varies dependent upon the stability of the atmosphere.
An alternative approach is given by the power-law method. This is a well-known engineering method commonly used to vertically extrapolate wind speed. The equation is written as u ( z ) = u r z / z r ? where is the wind shear exponent, commonly assumed to be.
Note to the definition of "high wind": The Occupational Safety and Health Administration normally considers winds exceeding 64.4 kilometers per hour (40 miles per hour), or 48.3 kilometers per hour (30 miles per hour) if the work involves material handling, as meeting this criteria, unless the employer takes ...
A 1/7 power law is often used to estimate atmospheric wind profiles. The use of this relationship, while perhaps appropriate in a climatological sense for daytime wind profiles in the lower atmosphere, frequently results in serious underestimates of wind speeds aloft at night.