Probability density functions of turbulent velocity and temperature in the atmospheric surface layer

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题名:	Probability density functions of turbulent velocity and temperature in the atmospheric surface layer
作者:	Chu,CR;Parlange,MB;Katul,GG;Albertson,JD
贡献者:	土木工程研究所
关键词:	EXPONENTIAL TAILS;BOUNDARY-LAYERS;CONVECTION;FLUXES;FLOWS
日期:	1996
上传时间:	2010-06-29 17:10:55 (UTC+8)
出版者:	中央大學
摘要:	The probability density functions (pdf's) for the longitudinal and vertical velocities, temperature, their derivatives, and momentum and sensible heat fluxes were measured in the atmospheric surface layer for a wide range of atmospheric stability conditions. The measured pdf's for both the velocity and the temperature fluctuations are near-Gaussian and consistent with corresponding laboratory measurements for near-neutral and stable stability conditions. Hence the first- and second-order moments are sufficient to predict the heat and momentum flux pdf's. The lower-order moments can be estimated from mean meteorological conditions using surface layer similarity theory. For unstable conditions the pdf for temperature is non-Gaussian and is strongly skewed due to local convective thermal plumes. For near-neutral and stable conditions the pdf's for the velocity and temperature longitudinal gradients have long exponential tails, in agreement with findings in laboratory experiments and numerical simulations.
關聯:	WATER RESOURCES RESEARCH
显示于类别:	[土木工程研究所] 期刊論文

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