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Proceedings Paper

Validation of a bulk turbulence model with thermal images of a point source
Author(s): Gerard J. Kunz; Marcel M. Moerman; Peter J. Fritz; Gerrit de Leeuw
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Paper Abstract

A model was developed for the prediction of turbulence in the marine surface layer. The model requires standard meteorological values of air temperature, air humidity, wind speed each from any given height from within the surface layer and the sea surface temperature. Internally, the model is controlled by the exchange coefficients for momentum, heat and water vapor. A variant using the surface roughness length instead of the drag coefficient has also been implemented. The micrometeorological output parameters of the model are used to predict vertical profiles of the refractive index -- to predict refractivity effects -- and profiles of the refractive index structure function parameter Cn2(z). The latter is the controlling parameters to calculate optical turbulence effects such as scintillation and blurring. Experimental data were obtained from images taken of a point source over a 19 km path over the North Sea at a frame rate of 25 Hz using a 3 - 5 micrometer infrared camera system. The images were analyzed for scintillation, blur and image dancing. Predicted and measured turbulence effects are compared.

Paper Details

Date Published: 14 October 1996
PDF: 9 pages
Proc. SPIE 2828, Image Propagation through the Atmosphere, (14 October 1996); doi: 10.1117/12.254158
Show Author Affiliations
Gerard J. Kunz, TNO Physics and Electronics Lab. (Netherlands)
Marcel M. Moerman, TNO Physics and Electronics Lab. (Netherlands)
Peter J. Fritz, TNO Physics and Electronics Lab. (Netherlands)
Gerrit de Leeuw, TNO Physics and Electronics Lab. (Netherlands)


Published in SPIE Proceedings Vol. 2828:
Image Propagation through the Atmosphere
Christopher Dainty; Luc R. Bissonnette, Editor(s)

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