A spatial length scale analysis of turbulent temperature and velocity fluctuations within and above an orchard canopy |
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| Authors: | Y S Wang D R Miller D E Anderson R M Cionco J D Lin |
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| Institution: | (1) Department of Natural Resources Management and Engineering, University of Connecticut, 06269-4087 Storrs, CT, USA;(2) U.S. Army Atmospheric Science Laboratory, 88002 White Sands Missile Range, NM, USA;(3) Department of Civil Engineering, University of Connecticut, 06269-4037 Storrs, CT, USA |
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| Abstract: | Turbulent flow within and above an almond orchard was measured with three-dimensional wind sensors and fine-wire thermocouple sensors arranged in a horizontal array. The data showed organized turbulent structures as indicated by coherent asymmetric ramp patterns in the time series traces across the sensor array. Space-time correlation analysis indicated that velocity and temperature fluctuations were significantly correlated over a transverse distance more than 4m. Integral length scales of velocity and temperature fluctuations were substantially greater in unstable conditions than those in stable conditions. The coherence spectral analysis indicated that Davenport's geometric similarity hypothesis was satisfied in the lower frequency region. From the geometric similarity hypothesis, the spatial extents of large ramp structures were also estimated with the coherence functions. |
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