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  4. Optical turbulence in the coastal area over False Bay, South Africa: Comparison of measurements and modeling results
 
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2018
Conference Paper
Titel

Optical turbulence in the coastal area over False Bay, South Africa: Comparison of measurements and modeling results

Abstract
The atmospheric influence on wave propagation was investigated during the First European South African Transmission ExpeRiment (FESTER) from June 2015 to February 2016. The focus in this article was set on optical turbulence, the main atmospheric factor affecting the position and strength of Laser beams, the performance of electro-optical systems and imaging. Measurements were performed continuously during the campaign on three sites over the northwestern part of False Bay. The optical turbulence measurements include in situ measurements using an ultrasonic anemometer at the Roman Rock Island. Integrated optical turbulence measurements were performed at two sites, over a path of 1.8 km and a long distance path of 8.6 km. The sites may be affected by local effects of the coastal environment. For comparison, the optical turbulence was modeled using micrometeorological parameterization. Additionally, the optical turbulence was determined by simulations using the weather research and forecast model WRF. Simulation results were compared to measurements considering seasonal and meteorological variations. The representativeness of the measurements locations for offshore measurements will be discussed.
Author(s)
Sprung, Detlev
Eijk, Alexander M.J. van
Ullwer, Carmen
Gunter, Willi
Eisele, Christian
Seiffer, Dirk
Sucher, Erik
Stein, Karin
Hauptwerk
Environmental Effects on Light Propagation and Adaptive Systems
Konferenz
Conference "Environmental Effects on Light Propagation and Adaptive Systems" 2018
Thumbnail Image
DOI
10.1117/12.2325609
Language
English
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Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Tags
  • inhomogeneous distribution of optical turbulence

  • maritime surface layer

  • seasonal cycle

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