The techniques used to estimate the statistical parameters describing the
turbulent velocity fluctuations in an urban atmospheric boundary layer simulated
in a long test section wind tunnel are described. An extensive review of the
theory underlying the selection of autocovariance and spectral density function
estimators and of the equations needed for the digital evaluation of sample
spectra using Fast Fourier Transforms is presented. A computer program for
evaluation of sample spectra and autocovariances, developed on the basis of these
equations and including the determination of confidence intervals for the
spectral estimates, is given. The selection of series and subseries lengths and
sampling intervals is illustrated through application of the program to
autoregressive processes and to the atmospheric boundary layer velocity
fluctuation data. The determination of integral length scales and the scales in
the inertial subrange of the spectrum is discussed in particular for the velocity
National Science Foundation; Stripper Well Overcharge Grant, Minnesota State Department of Administration
Farell, Cesar; Iyengar, Arun K. S..
Time Series Analysis With Application to Velocity Fluctuation Data Measured in a Wind Tunnel, Atmospheric Boundary Layer.
St. Anthony Falls Hydraulic Laboratory.
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