Abstract
Abstract : GENERAL CHARACTERISTICS OF WIND SPEED AND DIRECTION VARIABILITY AT HEIGHTS OF 1.5 AND 4.0 METERS ARE PRESENTED AS FUNCTIONS OF SPACE, TIME, AVERAGING TIME OF DATA, MEAN WIND SPEED, LAG TIME, THERMAL STABILITY (BETWEEN 0. 5 AND 4.0 METERS), AND ORIENTATION OF SENSOR LINE RELATIVE TO MEAN WIND DIRECTION. In addition, there is an example of mean longitudinal and lateral wind component differences and standard deviation as a function of horizontal distance separation at a height of 4.0 meters. The data show wind speed differences of less than 0.8 mps for distance separations between instruments of 150 to 175 meters and the mean wind speed less than 4 mps. Wind direction differences vary from 10 to 50 degrees. Moreover, it is shown that the standard deviation of the longitudinal wind differences has the same general characteristics as the wind speed, whereas the standard deviation of the lateral wind is similar to the wind direction.
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