ResearchSpace

Comparison of slant-path scintillometry, sonic anemometry and high-speed videography for vertical profiling of turbulence in the atmospheric surface layer

Show simple item record

dc.contributor.author Griffith, DJ
dc.contributor.author Sprung, D
dc.contributor.author Sucher, E
dc.contributor.author Ramkilowan, A
dc.contributor.author Vhengani, L
dc.date.accessioned 2014-05-13T07:22:09Z
dc.date.available 2014-05-13T07:22:09Z
dc.date.issued 2013-09
dc.identifier.citation Griffith, D.J, Sprung, D, Sucher, E, Ramkilowan, A and Vhengani, L. 2013. Comparison of slant-path scintillometry, sonic anemometry and high-speed videography for vertical profiling of turbulence in the atmospheric surface layer. In: Proceedings of SPIE 8890, Remote Sensing of Clouds and the Atmosphere XVIII; and Optics in Atmospheric Propagation and Adaptive Systems XVI, Dresden, Germany, 23-26 September 2013 en_US
dc.identifier.uri http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1758712
dc.identifier.uri http://hdl.handle.net/10204/7397
dc.description Proceedings of SPIE 8890, Remote Sensing of Clouds and the Atmosphere XVIII; and Optics in Atmospheric Propagation and Adaptive Systems XVI, Dresden, Germany, 23-26 September 2013 en_US
dc.description.abstract The optical effect of atmospheric turbulence greatly inhibits the achievable range of Detection, Recognition and Identification (DRI) of targets when using imaging sensors within the surface layer. Since turbulence tends to be worst near the ground and decays with height, the question often arises as to how much DRI range could be gained by elevating the sensor. Because this potential DRI gain depends on the rate of decay of turbulence strength with height in any particular environment, there is a need to measure the strength profile of turbulence with respect to height in various environments under different atmospheric and meteorological conditions. Various techniques exist to measure turbulence strength, including scintillometry, sonic anemometry, Sound Detection and Ranging (SODAR) and the analysis of point source imagery. These techniques vary in absolute sensitivity, sensitivity to range profile, temporal and spatial response, making comparison and interpretation challenging. We describe a field experiment using multiple scintillometers, sonic anemometers and point source videography to collect statistics on atmospheric turbulence strength at different heights above ground. The environment is a relatively flat, temperate to sub-tropical grassland area on the interior plateau of Southern Africa near Pretoria. The site in question, Rietvlei Nature Reserve, offers good spatial homogeneity over a substantial area and low average wind speed. Rietvlei was therefore chosen to simplify comparison of techniques as well as to obtain representative turbulence profile data for temperate grassland. A key element of the experimental layout is to place a sonic anemometer 15 m above ground at the centre of a 1 km slant-path extending from ground level to a height of 30 m. An optical scintillometer is operated along the slant-path. The experiment layout and practical implementation are described in detail and initial results are presented. en_US
dc.language.iso en en_US
dc.publisher SPIE Proceedings en_US
dc.relation.ispartofseries Workflow;12585
dc.subject Atmospheric turbulence en_US
dc.subject Sonic anemometer en_US
dc.subject Scintillometer en_US
dc.title Comparison of slant-path scintillometry, sonic anemometry and high-speed videography for vertical profiling of turbulence in the atmospheric surface layer en_US
dc.type Conference Presentation en_US
dc.identifier.apacitation Griffith, D., Sprung, D., Sucher, E., Ramkilowan, A., & Vhengani, L. (2013). Comparison of slant-path scintillometry, sonic anemometry and high-speed videography for vertical profiling of turbulence in the atmospheric surface layer. SPIE Proceedings. http://hdl.handle.net/10204/7397 en_ZA
dc.identifier.chicagocitation Griffith, DJ, D Sprung, E Sucher, A Ramkilowan, and L Vhengani. "Comparison of slant-path scintillometry, sonic anemometry and high-speed videography for vertical profiling of turbulence in the atmospheric surface layer." (2013): http://hdl.handle.net/10204/7397 en_ZA
dc.identifier.vancouvercitation Griffith D, Sprung D, Sucher E, Ramkilowan A, Vhengani L, Comparison of slant-path scintillometry, sonic anemometry and high-speed videography for vertical profiling of turbulence in the atmospheric surface layer; SPIE Proceedings; 2013. http://hdl.handle.net/10204/7397 . en_ZA
dc.identifier.ris TY - Conference Presentation AU - Griffith, DJ AU - Sprung, D AU - Sucher, E AU - Ramkilowan, A AU - Vhengani, L AB - The optical effect of atmospheric turbulence greatly inhibits the achievable range of Detection, Recognition and Identification (DRI) of targets when using imaging sensors within the surface layer. Since turbulence tends to be worst near the ground and decays with height, the question often arises as to how much DRI range could be gained by elevating the sensor. Because this potential DRI gain depends on the rate of decay of turbulence strength with height in any particular environment, there is a need to measure the strength profile of turbulence with respect to height in various environments under different atmospheric and meteorological conditions. Various techniques exist to measure turbulence strength, including scintillometry, sonic anemometry, Sound Detection and Ranging (SODAR) and the analysis of point source imagery. These techniques vary in absolute sensitivity, sensitivity to range profile, temporal and spatial response, making comparison and interpretation challenging. We describe a field experiment using multiple scintillometers, sonic anemometers and point source videography to collect statistics on atmospheric turbulence strength at different heights above ground. The environment is a relatively flat, temperate to sub-tropical grassland area on the interior plateau of Southern Africa near Pretoria. The site in question, Rietvlei Nature Reserve, offers good spatial homogeneity over a substantial area and low average wind speed. Rietvlei was therefore chosen to simplify comparison of techniques as well as to obtain representative turbulence profile data for temperate grassland. A key element of the experimental layout is to place a sonic anemometer 15 m above ground at the centre of a 1 km slant-path extending from ground level to a height of 30 m. An optical scintillometer is operated along the slant-path. The experiment layout and practical implementation are described in detail and initial results are presented. DA - 2013-09 DB - ResearchSpace DP - CSIR KW - Atmospheric turbulence KW - Sonic anemometer KW - Scintillometer LK - https://researchspace.csir.co.za PY - 2013 T1 - Comparison of slant-path scintillometry, sonic anemometry and high-speed videography for vertical profiling of turbulence in the atmospheric surface layer TI - Comparison of slant-path scintillometry, sonic anemometry and high-speed videography for vertical profiling of turbulence in the atmospheric surface layer UR - http://hdl.handle.net/10204/7397 ER - en_ZA


Files in this item

This item appears in the following Collection(s)

Show simple item record