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Comments on a relationship between fluid and immersed-particle velocity fluctuations proposed by Walklate (1987)
Springer Science and Business Media LLC - Tập 43 - Trang 93-98 - 1988
J. D. Wilson, E. P. Lozowski, Y. Zhuang
On Reynolds Averaging of Turbulence Time Series
Springer Science and Business Media LLC - Tập 128 - Trang 303-311 - 2008
George Treviño, Edgar L. Andreas
We show that validity of Reynolds averaging for estimating the (ensemble) mean of a turbulence time series requires that the series values be both stationary and uncorrelated. In strict statistical terminology, these two conditions are jointly designated as independent identically distributed (i.i.d.). Moreover, we show that when the series values are correlated, knowledge of the correlation betwe...... hiện toàn bộ
Runway Wake Vortex, Crosswind, and Visibility Detection with a Scintillometer at Schiphol Airport
Springer Science and Business Media LLC - Tập 157 - Trang 481-499 - 2015
D. van Dinther, O. K. Hartogensis, A. A. M. Holtslag
We evaluate the performance and investigate the capability of a scintillometer to detect wake vortices, crosswind and visibility near an airport runway. An experiment is carried out at Schiphol airport (Amsterdam, The Netherlands), where an optical scintillometer is positioned alongside a runway. An algorithm is developed to detect wake vortices, and also the strength of the wake vortex, from the ...... hiện toàn bộ
Influence from Surrounding Land on the Turbulence Measurements Above a Lake
Springer Science and Business Media LLC - Tập 150 - Trang 235-258 - 2013
Erik Sahlée, Anna Rutgersson, Eva Podgrajsek, Hans Bergström
Turbulence measurements taken at a Swedish lake are analyzed. Although the measurements took place over a relatively large lake with several km of undisturbed fetch, the turbulence structure was found to be highly influenced by the surrounding land during daytime. Variance spectra of both horizontal velocity and scalars during both unstable and stable stratification displayed a low frequency peak....... hiện toàn bộ
EVALUATION OF SURFACE-LAYER WIND PROFILES WITH HEIFE OBSERVATIONS
Springer Science and Business Media LLC - Tập 83 - Trang 27-41 - 1997
JINGMIAO LIU, KAZUO KOTODA
In this paper the mean wind speed profiles in the atmospheric surfacelayer over oasis, sand, and Gobi desert surfaces in the HEIhe river FieldExperiment (HEIFE) area are discussed for various stability conditions. Themathematical representation of mean wind speed profiles obtained fromdifferent sources are used to estimate the mean wind speeds, and the resultsare compared with observed wind speed ...... hiện toàn bộ
Can Data Mining Help Eddy Covariance See the Landscape? A Large-Eddy Simulation Study
Springer Science and Business Media LLC - Tập 176 - Trang 85-103 - 2020
Ke Xu, Matthias Sühring, Stefan Metzger, David Durden, Ankur R. Desai
Eddy-covariance fluxes serve as an essential benchmark for Earth system models and remote sensing data. However, two challenges prevent model-data intercomparisons from fully utilizing eddy-covariance fluxes. The first challenge stems from the differing and variable spatial representativeness of the eddy-covariance measurements, or footprint bias and transience. The second originates from the phen...... hiện toàn bộ
Early-Morning Flow Transition in a Valley in Low-Mountain Terrain Under Clear-Sky Conditions
Springer Science and Business Media LLC - Tập 152 - Trang 45-63 - 2014
Björn Brötz, Rafael Eigenmann, Andreas Dörnbrack, Thomas Foken, Volkmar Wirth
We investigate the evolution of the early-morning boundary layer in a low-mountain valley in south-western Germany during COPS (convective and orographically induced precipitation study) in summer 2007. The term low-mountain refers to a mountainous region with a relief of gentle slopes and with an absolute altitude that remains under a specified height (usually 1,500 m a.s.l.). A subset of 23 fair...... hiện toàn bộ
Turbulence-Kinetic-Energy Budget in the Urban-Like Boundary Layer Using Large-Eddy Simulation
Springer Science and Business Media LLC - Tập 178 - Trang 201-223 - 2020
Geng Tian, Boris Conan, Isabelle Calmet
We describe and explain the turbulent processes at play in the lower part of the urban boundary layer through performing a large-eddy simulation of the flow over an urban-like canopy composed of a staggered array of cubes with a packing density of 25%. The simulation models neutral thermal conditions at a Reynolds number (based on both velocity at the top of the domain and the domain height) of ...... hiện toàn bộ
Announcement
Springer Science and Business Media LLC - Tập 60 - Trang 205-205 - 1992
The dependence of the measured cool skin of the ocean on wind stress and total heat flux
Springer Science and Business Media LLC - Tập 10 - Trang 465-474 - 1976
Hartmut Grassl
The temperature drop δT between the ocean surface and the 5-cm depth was recorded during GATE, Phase III. With measured values of the total heat flux Q and an assumption about the thickness of the viscous boundary layer of the ocean, the wind-speed dependence of the factor of proportionality between δT and Q is determined. This factor depends on the deviations of the thickness of the conductive la...... hiện toàn bộ
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