Near-surface anisotropic turbulence

Cheryl Klipp

doi:10.1117/12.849557

4 May 2010 Near-surface anisotropic turbulence

Cheryl Klipp

Proceedings Volume 7685, Atmospheric Propagation VII; 768505 (2010) https://doi.org/10.1117/12.849557
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

Turbulent motion is nearly isotropic at spatial scales on the order of a few meters or less, but larger scales, which carry more energy, are anisotropic. It is found that the scales of peak contribution to the total turbulent kinetic energy vary from 50 to 5000 meters depending on stability and elevation above the surface. The scales of peak contribution to the heat flux vary 2 meters to 1000 meters depending on stability and elevation above the surface. The temperature variance shows little contribution at night for scales between a few meters and a few kilometers, while daytime peak temperature variances occur at scales on the order of 100 meters to 2000 meters depending on elevation. Also, the natural coordinate system for the turbulent motion is not aligned with the streamwise, cross-stream, vertical coordinate system and varies with the scale of the motion as well as stability.

Citation Download Citation

Cheryl Klipp "Near-surface anisotropic turbulence", Proc. SPIE 7685, Atmospheric Propagation VII, 768505 (4 May 2010); https://doi.org/10.1117/12.849557

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