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

Detlev Sprung; Alexander M. J. van Eijk; Carmen Ullwer; Willi Gunter; Christian Eisele; Dirk Seiffer; Erik Sucher; Karin Stein

doi:10.1117/12.2325609

10 October 2018 Optical turbulence in the coastal area over False Bay, South Africa: comparison of measurements and modeling results

Detlev Sprung, Alexander M. J. van Eijk, Carmen Ullwer, Willi Gunter, Christian Eisele, Dirk Seiffer, Erik Sucher, Karin Stein

Author Affiliations +

Proceedings Volume 10787, Environmental Effects on Light Propagation and Adaptive Systems; 1078703 (2018) https://doi.org/10.1117/12.2325609
Event: SPIE Remote Sensing, 2018, Berlin, Germany

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.

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Detlev Sprung, Alexander M. J. van Eijk, Carmen Ullwer, Willi Gunter, Christian Eisele, Dirk Seiffer, Erik Sucher, and Karin Stein "Optical turbulence in the coastal area over False Bay, South Africa: comparison of measurements and modeling results", Proc. SPIE 10787, Environmental Effects on Light Propagation and Adaptive Systems, 1078703 (10 October 2018); https://doi.org/10.1117/12.2325609

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