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Proceedings Paper

Optical turbulence over paved surfaces
Author(s): Volker Thiermann; Anandakumar Karipot; Inge Dirmhirn; Peter Poschl; Christian Czekits
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Paper Abstract

Modelling refractive index turbulence over paved surfaces is of significant importance to predict limitations on optical remote sensing systems operated over roads, airport runways, or urban areas. Since optical turbulence is generated by the turbulent heat transfer between ground and atmosphere, its magnitude depends on the thermal and dynamical properties of the surface. Compared with typical vegetated and unvegetated surfaces, the pavement has a significantly smaller roughness length, a lower albedo, and a higher heat conductivity and capacity. This results in a turbulent situation which is very different from that found over other areas and therefore needs special investigation. This paper presents a model to calculate the structure function constant Cn2 and the inner scale l0 of the refractive index fluctuations over a paved road. The basic input parameters are air temperature, surface temperature, and wind speed. We limit ourselves to the dry case. The model is verified by measurements taken in summer 1994 over a motorway near Vienna. Both Cn2 and l0 were determined using displaced-beam laser scintillation. The optical data is compared with the model applied to on-site meteorological observations. Good agreement is observed.

Paper Details

Date Published: 15 June 1995
PDF: 7 pages
Proc. SPIE 2471, Atmospheric Propagation and Remote Sensing IV, (15 June 1995); doi: 10.1117/12.211928
Show Author Affiliations
Volker Thiermann, Scintec Atmospharenmesstechnik GmbH (Germany)
Anandakumar Karipot, Univ. fuer Bodenkultur Wien (Austria)
Inge Dirmhirn, Univ. fuer Bodenkultur Wien (Austria)
Peter Poschl, Univ. fuer Bodenkultur Wien (Austria)
Christian Czekits, Univ. fuer Bodenkultur Wien (Austria)

Published in SPIE Proceedings Vol. 2471:
Atmospheric Propagation and Remote Sensing IV
J. Christopher Dainty, Editor(s)

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