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Proceedings Paper

Measurements of temperature and velocity structure parameters from sonic anemometers
Author(s): Prasan Chintawongvanich; Robert Olsen
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Paper Abstract

A study of two methods for computing temperature and velocity structure parameters CT2 and Cv2 is presented. Fluctuating temperature and wind data obtained from sonic anemometers were processed utilizing time and frequency analyses to derive CT2 and Cv2. The time-domain method is less rigorous and simplifies processing of the sonic anemometer data for deriving the turbulence parameters. The frequency-domain method has the advantage of providing the spectral characteristics of turbulence. This feature greatly facilitates in identifying data that contain spike noise. Thus, corrections may be made to adjust the derived values accordingly. The comparison shows a very good correlation between the two methods. However, the frequency-domain method yield results that are 2 2/3 times greater than the corresponding values from the time-domain method. The difference was determined to be a bias in the frequency-domain method, resulting from the coefficient used in the inertial subrange form of the one-dimensional spectrum, (Phi) theta((kappa) ) equals (alpha) Ctheta2(kappa) -5/3. In order to remove the bias, the coefficient (alpha) must be changed from the original value of 0.25 to 0.50.

Paper Details

Date Published: 15 September 1993
PDF: 7 pages
Proc. SPIE 1968, Atmospheric Propagation and Remote Sensing II, (15 September 1993); doi: 10.1117/12.154865
Show Author Affiliations
Prasan Chintawongvanich, New Mexico State Univ. (United States)
Robert Olsen, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 1968:
Atmospheric Propagation and Remote Sensing II
Anton Kohnle; Walter B. Miller, Editor(s)

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