Accession Number : AD0278428

Title :   A STUDY OF THE WIND PROFILE IN THE LOWEST 400 FEET OF THE ATMOSPHERE

Corporate Author : BROOKHAVEN NATIONAL LAB UPTON N Y

Personal Author(s) : SINGER,IRVING A. ; NAGLE,CONSTANCE M.

Report Date : 31 MAR 1962

Pagination or Media Count : 1

Abstract : A detailed study of the predictability of the scalar horizontal wind speed at an upper elevation from wind data obtained at lower reference heights over varying averaging lengths is summarized. To study this predictability, several mathematical models were developed. The first, or 'simple;' model was achieved by multiplying the reference speed by a constant to obtain the corresponding average at the higher elevation. This form was suggested by the power law describing the variation of the mean wind speed with height. The simple model, which employs spectral and cross-spectral computation, was used to evaluate the mean square error over various averaging lengths. The second or 'mean' model has the same general form as the first, but the mean value of the wind speed at all levels is subtracted from the actual wind speed prior to computation of the mean square error. The final model produces the best possible predictor using linear methods. This 'best possible' model, although not applicable under actual conditions, provides a benchmark with which the mean square errors from other linear models can be compared. Such comparison clearly indicates that the mean model is an excellent approximation to the best possible. (Author)

Descriptors :   CLOUDS, GUSTS, MEASUREMENT, STATISTICAL ANALYSIS, TEMPERATURE, TIME

Distribution Statement : APPROVED FOR PUBLIC RELEASE