Turbulence Intensity Parameters over a Very Complex Terrain |
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| Authors: | Cintya A Martins Osvaldo L L Moraes Otávio C Acevedo Gervásio A Degrazia |
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| Institution: | (1) Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA;(2) NOAA Earth System Research Laboratory, Boulder, CO, USA;(3) U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, NH, USA;(4) Present address: NorthWest Research Associates, Inc. (Bellevue Division), 25 Eagle Ridge, Lebanon, NH 03766-1900, USA;(5) Naval Postgraduate School, Monterey, CA, USA |
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| Abstract: | Detailed knowledge of turbulence structure is important for the understanding of atmospheric phenomena in the boundary layer,
especially over complex terrain. In the present study, turbulence intensity parameters are analyzed for different conditions
regarding stability, wind speed and wind direction over a mountainous region. The purpose of the analysis is to verify whether
the observed parameters follow Monin–Obukhov similarity theory (MOST), despite the terrain heterogeneity. The dataset was
collected during an experimental campaign at the Nova Roma do Sul site, in southern Brazil, with a micrometeorological tower
located near a sharp slope, approximately 400 m high. The results show that the normalized standard deviations of the vertical
velocity component as well as the normalized standard deviation of temperature follow Monin–Obukhov similarity for all stability
regimes, regardless of the wind direction. However the normalized standard deviation of the horizontal components of the turbulent
velocity obeys the similarity relationship only for a limited range of the stability parameters. |
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