Accession Number : ADA294418

Title :   Multiresolution Feature Analysis and Wavelet Decomposition of Atmospheric Flows.

Descriptive Note : Final technical rept. 1 Apr 89-30 Sep 91,

Corporate Author : STANFORD UNIV CA ENVIRONMENTAL FLUID MECHANICS LAB

Personal Author(s) : Ludwig, Francis L. ; Cross, James C., III ; Street, Robert L.

PDF Url : ADA294418

Report Date : DEC 1992

Pagination or Media Count : 14

Abstract : This is the final technical report on application of fractal concepts to the analysis of atmospheric processes for the period from 4/1/89 through 9/30/91. The goal of the research was to improve understanding of atmospheric processes through the application of analytical approaches derived from the methods that have been associated with fractal and wavelet methods. This was the first phase of ongoing work that is now supported by a new grant for the period to 9/30/94. There were two major thrusts of this work to date. First, multiresolution feature analysis was applied to an atmospheric data set. In the process the analysis was extended to three-dimensional vector fields. To make the three-dimensional vector features 'imaginable,' a variant of the Lorenz concept of empirical orthogonal function or EOF was adopted. These allow representation of empirically-defined patterns of small-scale atmospheric motions. Second, a strategy for the generalized wavelet analysis of homogeneous turbulence was developed. The strategy calls for decomposition of a collection of direct numerical simulation data sets for homogeneous turbulence in a stratified Boussinesq fluid subject to an imposed shear, in both two and three dimension.

Descriptors :   *FRACTALS, *ATMOSPHERIC PHYSICS, DATA BASES, TURBULENCE, ATMOSPHERIC MOTION, METEOROLOGICAL DATA, THREE DIMENSIONAL, VECTOR ANALYSIS, DECOMPOSITION, ORTHOGONALITY, FUNCTIONS(MATHEMATICS), HOMOGENEITY, FLUID MECHANICS.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE