Boundary-Layer Turbulence Over The Nebraska Sandhills |
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| Authors: | Yoseph G Mengesha Peter A Taylor Donald H Lenschow |
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| Institution: | (1) Department of Earth and Atmospheric Science, York University, Toronto, Ontario, Canada;(2) Microscale and Mesoscale Meteorology, NCAR, Boulder, Colorado, USA |
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| Abstract: | Data from National Centre for Atmospheric Research (NCAR) Queen Air boundary-layer flights over the Nebraska Sandhills are analyzed to investigate the effects of these low hills on boundary-layer turbulence. The Sandhills are an area of anisotropic rolling terrain with characteristic wavelengths of order 2km and rms height variations of order 25m. The biggest impact is found in early morning flight data where horizontal velocity perturbations appear at the same wavelengths as the terrain and variances (normalised by u
2
, where u is the local friction velocity) are significantly enhanced relative to standard flat terrain values. By contrast the vertical velocity variance seems less affected and terrain effects are much less evident in data from the afternoon convective boundary layer. |
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| Keywords: | Complex terrain Flow over hills Topographic effects Turbulence |
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