Accession Number : AD0466161

Title :   ON WIND SHEAR DISTRIBUTIONS FOR SMALLER SHEAR INTERVALS,

Corporate Author : ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING LAB REDSTONE ARSENAL AL PHY SICAL SCIENCES DIRECTORATE

Personal Author(s) : Essenwanger, O. ; Billions, N.

Report Date : 01 MAY 1965

Pagination or Media Count : 28

Abstract : The problem of deriving frequency distributions of wind shear values for smaller shear intervals than measured by the radiosonde method is discussed. The relationship between shear interval and statistical parameters is given in equation form. This is confirmed by empirical data of instantaneous wind observations obtained from measurements taken aboard research rockets. These equations can be utilized to derive the parameters for wind shear distributions of smaller shear inerements when frequency distributions of wind shear distributions for larger shear intervals are given. Several prediction schemes are analyzed, and results are checked on independent data not utilized for derivation of the general laws. The prediction method found most suitable, and introduced in this report, is tested on radiosonde data for Washington, D. C., to show the discrepancy between the normally used scaled down method and the analytical method as discussed in this report. Further, empirical frequency distributions of wind shear vectors are compared with theoretical distributions to evaluate the best approximations by an analytical distribution. (Author)

Descriptors :   (*ATMOSPHERIC MOTION, STATISTICAL DISTRIBUTIONS), (*WIND, SHEAR STRESSES), MATHEMATICAL PREDICTION, RADIOSONDES, DISTRICT OF COLUMBIA.

Distribution Statement : APPROVED FOR PUBLIC RELEASE