期刊
EXPERIMENTS IN FLUIDS
卷 55, 期 5, 页码 -出版社
SPRINGER
DOI: 10.1007/s00348-014-1737-1
关键词
-
资金
- US Department of Energy [DE-EE0002980]
We present an implementation of super-large-scale particle image velocimetry (SLPIV) to characterize spatially the turbulent atmospheric boundary layer using natural snowfall as flow tracers. The SLPIV technique achieves a measurement area of similar to 22 m 9 52 m, up to 56 m above the ground, with a spatial resolution of similar to 0.34 m. The traceability of snow particles is estimated based on their settling velocity obtained from the wall-normal component of SLPIV velocity measurements. The results are validated using coincident measurements from sonic anemometers on a meteorological tower situated in close proximity to the SLPIV sampling area. A contrast of the mean velocity and the streamwise Reynolds stress component obtained from the two techniques shows less than 3 and 12 % difference, respectively. Additionally, the turbulent energy spectra measured by SLPIV show a similar inertial subrange and trends when compared to those measured by the sonic anemometers.
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