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    Groenekennis - Informatie voor professionals in voedsel en groen

    Groenekennis bevat artikelen uit vaktijdschriften, rapporten, video’s, presentaties, posters en websites op het gebied van landbouw, visserij, groene ruimte en voeding. Groenekennis wordt dagelijks bijgewerkt en bevat ongeveer 500.000 bronnen.

    Groenekennis is de globale view over diverse deelbestanden. Groenekennis is gevuld met alle informatie uit Groen Kennisnet, de Hydrotheek, Tuinpad, IB archief, ARTIK, bioKennis, Kennisbank Plantaardige bronnen, Kennisbank Zeldzame landbouwhuisdieren en afgesloten documentatiebestanden zoals Land Bodem Water en Consumenten- en huishoudstudies.

    Groen Kennisnet is een zeer belangrijk onderdeel van Groenekennis. De doelstelling van Groen Kennisnet is kennis delen op het gebied van Voedsel en Groen te bevorderen en te faciliteren voor een breed publiek.

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Renaissance of scintillometry \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Bruin, H.A.R. \ 2002
In the 1970s impressive progress was made in research on turbulence and the use of scintillometers; in the early 1990s funding and interest in scintillometry faded rapidly. This paper is a result of a renewed interest and it presents some novel findi ...
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The applicability of the scintillation method over heterogeneous areas \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Meijninger, W.M.L. \ Koshiek, W. \ Bruin, H.A.R. de \ 2002
Surface fluxes at a scale of several kilometers are required in many meteorological studies. The scintillation technique is one of the few methods that can provide fluxes at these scales (1 - 10 km). Since usually the earth's surface is heterogeneous ...
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Significance of axis rotation for eddy-covariance measurements \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Moene, A.F. \ Hartogensis, O.K. \ Heusinkveld, B.G. \ Meijninger, W.M.L. \ Dijk, A. van \ [2002]
Sonic anemometers are used to determine the vertical fluxes of momentum and scalars in the atmospheric surface layer. In practice the coordinate systems of the sonic anemometer and the surface will not be perfectly aligned so that a tilt-correction f ...
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The shear contribution to the evolution of a convective boundary layer \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Pino, D. \ Duynkerke, P. \ Vila-Guerau de Arellano, J. \ [2002]
The role of the shear on the growth rate of a convective boundary layer over land is studied with detailed observations and large-eddy simulations (LES). Typically, it is found that under pure convective conditions, without shear, the entrainment buo ...
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Turbulent structures in the convective boundary layer, such as plumes and puffs, in relation to thermal characteristics of the surface \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Nieuwstadt, F.T.M. \ Hunt, J.C.R. \ Fernando, H.S. \ [2002]
We consider turbulent convection in a horizontal fluid layer of depth h, which lies above a solid base with thickness hb. The fluid parameters are the kinematic viscosity n, the thermal diffusivity k, which is taken to be comparable with n, the densi ...
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Evaluation of relationships between boundary-layer height and heat flux \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Schipper, J.W. \ Angevine, W.M. \ White, A.B. \ Myers, T. \ [2002]
Three relationships between surface heat flux, boundary layer height, and lapse rate from the literature are evaluated using data taken in summertime continental conditions. Simple relationships work well for diagnosing boundary layer height if the h ...
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Size statistics of cumulus cloud populations in large-eddy simulations \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Neggers, R.A.J. \ Jonker, H.J.J. \ Siebesma, A.P. \ [2002]
Cloud size distributions of shallow cumulus cloud populations are calculated using the Large-Eddy Simulation (LES) approach. A range of different cases is simulated, and the results are compared to observations of real cloud populations. Accordingly ...
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Observations of the morning transition of the convective boundary layer \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Angevine, W.M. \ Klein Baltink, H. \ Bosveld, F.C. \ [2002]
The morning transition between the stable nocturnal situation and the daytime convective boundary layer (CBL) is of interest both for basic understanding and for initializing prognostic models. While the morning growth phase of the CBL has been studi ...
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Long range scintillometry \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Kohsiek, W. \ Meijninger, W.M.L. \ Bruin, H.A.R. de \ 2002
In the past years there has been a renewed interest in the use of scintillometers for the measurement of sensible and latent heat flux. This interest is partly invoked by the need to infer the energy fluxes over areas that match in size with satellit ...
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LES: how large is large enough? \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Duynkerke, P.G. \ Jonker, H.J.J. \ Roode, S.R. de \ [2002]
Aircraft observations made in the convective boundary layer (CBL) have shown that the peak of the vertical velocity spectra occurs at a wavelength about 1.5 times the boundary layer depth (H). This implies that most of the variance is present at a ch ...
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The role of the filter in the filtered navier-stokes equation \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Dijk, A. van \ Duynkerke, P.G. \ 2002
In Large Eddy Simulation (LES) the filtered Navier-Stokes equations are solved instead of the full equations. An extra term appears in the filtered Navier Stokes equation when compared with the full Navier Stokes equation, which is called the "subgri ...
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Countergradient fluxes in the clear convective boundary layer. The role of the entrainment flux \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Roode, S.R. de \ Duynkerke, P.G. \ Jonker, H.J.J. \ [2002]
Since a few decades it is known that in the interior of the clear convective boundary layer (CBL) the vertical flux of the (virtual) potential temperature flows counter the mean vertical gradient. This behaviour impedes a straightforward eddy diffusi ...
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Shallow cumulus convection: a validation of large-eddy simulation against aircraft and Landsat observations \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Neggers, R.A.J. \ Duynkerke, P.G. \ Rodts, S.M.A. \ [2002]
Large-eddy simulation (LES) results of shallow cumulus convection are directly evaluated against in-cloud aircraft-measurements, as made during the Small Cumulus and Microphysics Study (SCMS). To this purpose an LES case is first constructed, based o ...
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Fluxes and (co-)variances of reacting scalars in the convective boundary layer \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Vinuesa, J.F. \ Vila-Guerau de Arellano, J. \ [2002]
The control of turbulent mixing on the reactivity of species is studied by analyzing the contribution of the chemical terms to the governing equations for reactants. For reacting scalars with a short chemical lifetime or with a lifetime at the same o ...
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Dispersion of a passive tracer in a buoyancy- and shear-driven boundary layer \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Dosio, A. \ Vila-Guerau de Arellano, J. \ Holtslag, A.A.M. \ Builtjes, P.J.H. \ [2002]
When studying turbulent dispersion two driving mechanisms have to be taken in account, namely the thermal and the mechanical forcing. Although dispersion of a tracer in a Convective Boundary Layer (CBL) is a relatively well-known process investigated ...
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Velocity, temperature and scalar length scales in the CBL: observations and theory \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Dop, H. van \ Herwijnen, A. van \ As, D. van \ Hibberd, M.F. \ [2002]
Experimental evidence and LES suggest that the boundary-layer height is not the only length scale in the CBL. Jonker et al. (H.J.J Jonker, P.G. Duynkerke and J.W.M. Cuijpers, J. Atmos. Sci.,56, 801 - 808, 1999) reported steadily growing length scales ...
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Measuring the viscous dissipation of turbulent kinetic energy with a hotwire and a sonic anemometer \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Slager, J. \ Duynkerke, P.G. \ Dijk, A. van \ [2002]
We used a combination of a sonic- and a hotwire anemometer to measure the smallest structures in the atmospheric boundary layer, with the aim to evaluate the kinetic energy balances under different stability conditions. The sonic anemometer was used ...
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Estimation of the integral time scale with time series models \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Waele, S. de \ Dijk, A. van \ Broersen, P. \ Duynkerke, P. \ [2002]
The integral time scale Ti is a characteristic time scale for the dynamics of measured quantities in a turbulent flow such as temperature, wind velocity and humidity. It is defined as the sum of the squared autocorrelation function r(n). Ti is a meas ...
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Estimation of the statistical error in large eddy simulation results \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Moene, A.F. \ Michels, B.I. \ [2002]
In the study of the atmospheric boundary layer, Large Eddy Simulation (LES) results are nearly considered to be experimental data. However, where experimental results on turbulent quantities are occasionally accompanied by an estimation of the statis ...
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Boundary layer measurements with a 3GHz FMCW atmospheric profiler \ 15th symposium on boundary layers and turbulence, 15-19 July 2002, Wageningen, The Netherlands [Hoofdstuk uit boek]
Heijnen, S.H. \ Klein-Baltink, H. \ Russchenberg, H.W.J. \ Verlinde, H. \ Zwan, W.F. van der \ [2002]
The Transportable Atmospheric RAdar, TARA, is a highly sensitive and high-resolution atmospheric profiler. Designed for use in experimental atmospheric research, the system is based on the FMCW radar principle such that system specifications like sen ...
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