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Registros recuperados: 5
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Accounting for atmospheric boundary layer variability on flux estimation from RS observations Inra
Timmermans, W.J.; Bertoldi, G.; Albertson, J.D.; Olioso, A.; Su, Z.; Gieske, A.S.M..
A Large Eddy Simulation (LES) model is coupled to a remote-sensing-basedSVAT that accounts for soil and vegetation in order to study the feedback effectsbetween surface state and spatial variability in fluxes, through the induction ofspatial variability in the lower atmosphere. As such, this study focuses on sensibleheat flux exchange. The simulations indicated that changes are introduced to theflux distributions mainly at higher surface temperatures. A scale-dependentmethod is presented to account for feedback effects. This showed the mostsignificant correlation between surface and air temperature at scales from 500 to1000m and modulated the spatial variance of sensible heat flux. This suggeststhat feedback effects act to limit the spatial variability in...
Tipo: Journal Article Palavras-chave: REMOTE SENSING; MODELLING; LARGE EDDY SIMULATION; LES; SVAT; HEAT FLUX EXCHANGE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200838de219f&uri=/notices/prodinra1/2008/09/
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La dispersion du pollen : mécanismes, modélisation et questions actuelles de recherche Inra
Brunet, Y..
Tipo: Meeting Paper Palavras-chave:  DISPERSION DU POLLEN; LOI DE STOKES; VITESSE DE CHUTE; SEDIMENTATION; TURBULENCE; MODELISATION; MESURES AEROPORTEES LARGE-EDDY SIMULATION; LES; ARPS .
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010335a0183&uri=/notices/prodinra1/2011/05/
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Modelling forest canopy motion using a porous elastic approach Inra
PIVATO, D.; Dupont, S.; Brunet, Y..
In order to investigate the possibility of modelling plant motion at the landscape scale, an equation for canopy plant motion, forced by the instantaneous wind flow, is introduced in a largeeddy simulation (LES) airflow model, previously validated over homogeneous and heterogeneous canopies. The canopy is simply represented as a poroelastic continuous medium, which issimilar in its discrete form to an infinite row of identical stems. In a first step only one linear mode of plant vibration is considered. The two-way coupling between plant motion and the wind flow occurs through the drag force term. This coupled model is validated against data recordedover an alfafa canopy, whose motions have been analysed elsewhere in great detailsfrom video recordings. It...
Tipo: Conference Paper Palavras-chave: MODELISATION; LUZERNE LARGE-EDDY SIMULATION; LES; HONAMI.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200972633c5e&uri=/notices/prodinra1/2011/05/
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On the current status of flow modelling for applications to advection Inra
Brunet, Y.; Dupont, S..
Tipo: Meeting Paper Palavras-chave:  MECANIQUE DES FLUIDES; ; MODELES ATMOSPHERIQUES; ; LISIERE;  LARGE EDDY SIMULATION; ; LES.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010948c6d97&uri=/notices/prodinra1/2011/05/
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Tree motion in heterogeneous forests: a coupled flow-tree simulation study Inra
Brunet, Y.; Roux, P.; Dupont, S..
Landscape heterogeneities such as forest edges, clearings or gaps, as well as the presence of topography, induce spatial variations in turbulence properties that may have considerable impact on the aerodynamic sollications exerted on the trees. The heterogeneity in the damages caused by windstorms in forested landscapes can be partly attributed to such spatial variations in windload. We investigate here the impact of landscape heterogeneity on tree motion using a coupled flow-tree modelling approach. The simulation of flow fields is provided at fine spatial and temporal resolution by a large-eddy simulation (LES) model and the simulation of tree movements induced by instantaneous wind forces is provided by a mechanistic, dynamical model of tree behaviour....
Tipo: Conference Paper Palavras-chave: HETEROGENEITE DU PAYSAGE ; DEGAT FORESTIER  LARGE-EDDY SIMULATION; LES.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009a67117d&uri=/notices/prodinra1/2011/05/
Registros recuperados: 5
Primeira ... 1 ... Última
 

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