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Auteur Y. Brunet
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Faire une suggestion Affiner la rechercheEvaluation numérique et expérimentale des effets de la structure de la végétationsur l'écoulement de la couche de surface atmosphérique / Pierre-Yves Colin
Titre : Evaluation numérique et expérimentale des effets de la structure de la végétationsur l'écoulement de la couche de surface atmosphérique Type de document : thèse Auteurs : Pierre-Yves Colin, Auteur ; Y. Brunet ; J. M. C. Mendes-Lopes ; J. Marcillat ; LARINI M. ; M. Naaim, Examinateur ; F. Naaim-Bouvet, Examinateur ; MORVAN D., Examinateur ; LARINI M., Examinateur ; J. Marcillat, Directeur de thèse ; J. M. C. Mendes-Lopes, Rapporteur ; Y. Brunet, Rapporteur ; N. Coste Année de publication : 2005 Importance : XI-246 p. Présentation : ill. en noir et en coul. Format : 30 cm Langues : Anglais (eng) Catégories : Spécialité:Mécanique:Option : Mécanique des fluides Origine de thèse : ED Physique, Modélisation et Sciences pour l'ingén Evaluation numérique et expérimentale des effets de la structure de la végétationsur l'écoulement de la couche de surface atmosphérique [thèse] / Pierre-Yves Colin, Auteur ; Y. Brunet ; J. M. C. Mendes-Lopes ; J. Marcillat ; LARINI M. ; M. Naaim, Examinateur ; F. Naaim-Bouvet, Examinateur ; MORVAN D., Examinateur ; LARINI M., Examinateur ; J. Marcillat, Directeur de thèse ; J. M. C. Mendes-Lopes, Rapporteur ; Y. Brunet, Rapporteur ; N. Coste . - 2005 . - XI-246 p. : ill. en noir et en coul. ; 30 cm.
Langues : Anglais (eng)
Catégories : Spécialité:Mécanique:Option : Mécanique des fluides Origine de thèse : ED Physique, Modélisation et Sciences pour l'ingén Réservation
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Code-barres Cote Support Localisation Section Disponibilité TH1474 2005 COL Document imprimé IRPHE Salle du conseil Disponible Modélisation physique de la propagation des feux de forêts : Effets des caractéristiques physiques du combustible et de son hétérogénéité / François Pimont
Titre : Modélisation physique de la propagation des feux de forêts : Effets des caractéristiques physiques du combustible et de son hétérogénéité Type de document : thèse Auteurs : François Pimont, Auteur ; E. Richard, Rapporteur ; J. L. Torero, Rapporteur ; D. Morvan, Directeur de thèse ; J-L. Dupuy ; J. H. Balbi, Examinateur ; Y. Brunet, Examinateur ; P. Haldenwang, Examinateur ; R. Linn, Invité Année de publication : 2008 Langues : Français (fre) Note de contenu : Thèse de doctorat
Spécialité : Sciences de l'Environnement
Option : Environnement TerrestreModélisation physique de la propagation des feux de forêts : Effets des caractéristiques physiques du combustible et de son hétérogénéité [thèse] / François Pimont, Auteur ; E. Richard, Rapporteur ; J. L. Torero, Rapporteur ; D. Morvan, Directeur de thèse ; J-L. Dupuy ; J. H. Balbi, Examinateur ; Y. Brunet, Examinateur ; P. Haldenwang, Examinateur ; R. Linn, Invité . - 2008.
Langues : Français (fre)
Note de contenu : Thèse de doctorat
Spécialité : Sciences de l'Environnement
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Code-barres Cote Support Localisation Section Disponibilité TH1496 2008 PIM Document imprimé IRPHE Salle du conseil Disponible Boundary-Layer Meteorology, Vol.65 No.4. Detection of turbulent coherent motions in a forest canopy. 1, Wavelet analysis / S. Collineau
in Boundary layer meteorology
Titre de série : Boundary-Layer Meteorology, Vol.65 No.4 Titre : Detection of turbulent coherent motions in a forest canopy. 1, Wavelet analysis Type de document : articles et extraits Auteurs : S. Collineau, Auteur ; Y. Brunet, Auteur Année de publication : 1993 Importance : p.357-379 Langues : Français (fre) Résumé : Turbulence measurements performed at high frequencies yield data revealing intermittent and multi-scale processes. Analysing time series of turbulent variables thus requires extensive numerical treatment capable, for instance, of performing pattern recognition. This is particularly important in the case of the atmospheric surface layer and specifically in the vicinity of plant canopies, where large-scale coherent motions play a major role in the dynamics of turbulent transport processes. In this paper, we examine the ability of the recently developed wavelet transform to extract information on turbulence structure from time series of wind velocities and scalars
in Boundary layer meteorology
Boundary-Layer Meteorology, Vol.65 No.4. Detection of turbulent coherent motions in a forest canopy. 1, Wavelet analysis [articles et extraits] / S. Collineau, Auteur ; Y. Brunet, Auteur . - 1993 . - p.357-379.
Langues : Français (fre)
Résumé : Turbulence measurements performed at high frequencies yield data revealing intermittent and multi-scale processes. Analysing time series of turbulent variables thus requires extensive numerical treatment capable, for instance, of performing pattern recognition. This is particularly important in the case of the atmospheric surface layer and specifically in the vicinity of plant canopies, where large-scale coherent motions play a major role in the dynamics of turbulent transport processes. In this paper, we examine the ability of the recently developed wavelet transform to extract information on turbulence structure from time series of wind velocities and scalars
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Code-barres Cote Support Localisation Section Disponibilité ART-7695-0 ART Document imprimé Bureau chercheur Bureau de PIETRI Laurence Disponible Boundary-Layer Meteorology, Vol.66 No.1-2. Detection of turbulent coherent motions in a forest canopy. 2, Time-scales and conditional averages / S. Collineau
in Boundary layer meteorology
Titre de série : Boundary-Layer Meteorology, Vol.66 No.1-2 Titre : Detection of turbulent coherent motions in a forest canopy. 2, Time-scales and conditional averages Type de document : articles et extraits Auteurs : S. Collineau, Auteur ; Y. Brunet, Auteur Année de publication : 1993 Importance : p.49-73 Langues : Français (fre) Résumé : Turbulent exchanges between plant canopies and the atmosphere are known to be strongly affected by intermittent coherent motions, which appear on time traces of turbulent variables as periodic, large-amplitude excursions from the mean. Detecting these features requires objective and powerful signal analysis techniques. We investigate here the possibilities offered by the recently developed wavelet transform, presented in a companion paper. For this purpose, a set of data acquired in a 13.5 m high pine forest in southwestern France was used, which provided time series of wind velocities and air temperature recorded at two levels simultaneously, under moderately unstable conditions. Firstly, a duration scale of the active part of coherent motions was estimated from the wavelet variance
in Boundary layer meteorology
Boundary-Layer Meteorology, Vol.66 No.1-2. Detection of turbulent coherent motions in a forest canopy. 2, Time-scales and conditional averages [articles et extraits] / S. Collineau, Auteur ; Y. Brunet, Auteur . - 1993 . - p.49-73.
Langues : Français (fre)
Résumé : Turbulent exchanges between plant canopies and the atmosphere are known to be strongly affected by intermittent coherent motions, which appear on time traces of turbulent variables as periodic, large-amplitude excursions from the mean. Detecting these features requires objective and powerful signal analysis techniques. We investigate here the possibilities offered by the recently developed wavelet transform, presented in a companion paper. For this purpose, a set of data acquired in a 13.5 m high pine forest in southwestern France was used, which provided time series of wind velocities and air temperature recorded at two levels simultaneously, under moderately unstable conditions. Firstly, a duration scale of the active part of coherent motions was estimated from the wavelet variance
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Code-barres Cote Support Localisation Section Disponibilité ART-7694-0 ART Document imprimé Bureau chercheur Bureau de PIETRI Laurence Disponible Boundary-Layer Meteorology, Vol.78 No.3-4. Coherent eddies and turbulence in vegetation canopies : the mixing layer analogy / M.R. Raupach
in Boundary layer meteorology
Titre de série : Boundary-Layer Meteorology, Vol.78 No.3-4 Titre : Coherent eddies and turbulence in vegetation canopies : the mixing layer analogy Type de document : articles et extraits Auteurs : M.R. Raupach, Auteur ; Y. Brunet, Auteur ; J. J. Finnigan, Auteur Année de publication : 1996 Importance : p.351-382 ISBN/ISSN/EAN : 0006-8314 Langues : Français (fre) Résumé : This paper argues that the active turbulence and coherent motions near the top of a vegetation canopy are patterned on a plane mixing layer, because of instabilities associated with the characteristic strong inflection in the mean velocity profile. Mixing-layer turbulence, formed around the inflectional mean velocity profile which develops between two coflowing streams of different velocities, differs in several ways from turbulence in a surface layer. Through these differences, the mixing-layer analogy provides an explanation for many of the observed distinctive features of canopy turbulence. These include: (a) ratios between components of the Reynolds stress tensor; (b) the ratio K K of the eddy diffusivities for heat and momentum; (c) the relative roles of ejections and sweeps; (d) the behaviour of the turbulent energy balance, particularly the major role of turbulent transport; and (e) the behaviour of the turbulent length scales of the active coherent motions (the dominant eddies responsible for vertical transfer near the top of the canopy).It is predicted that these length scales are controlled by the shear length scale L = U(h) U'(h) (where h is canopy height, U (z) is mean velocity as a function of height z, and U' = dU dz). In particular, the streamwise spacing of the dominant canopy eddies is = mLs, with m = 8.1. These predictions are tested against many sets of field and wind-tunnel data. We propose a picture of canopy turbulence in which eddies associated with inflectional instabilities are modulated by larger-scale, inactive turbulence, which is quasi-horizontal on the scale of the canopy.
in Boundary layer meteorology
Boundary-Layer Meteorology, Vol.78 No.3-4. Coherent eddies and turbulence in vegetation canopies : the mixing layer analogy [articles et extraits] / M.R. Raupach, Auteur ; Y. Brunet, Auteur ; J. J. Finnigan, Auteur . - 1996 . - p.351-382.
ISSN : 0006-8314
Langues : Français (fre)
Résumé : This paper argues that the active turbulence and coherent motions near the top of a vegetation canopy are patterned on a plane mixing layer, because of instabilities associated with the characteristic strong inflection in the mean velocity profile. Mixing-layer turbulence, formed around the inflectional mean velocity profile which develops between two coflowing streams of different velocities, differs in several ways from turbulence in a surface layer. Through these differences, the mixing-layer analogy provides an explanation for many of the observed distinctive features of canopy turbulence. These include: (a) ratios between components of the Reynolds stress tensor; (b) the ratio K K of the eddy diffusivities for heat and momentum; (c) the relative roles of ejections and sweeps; (d) the behaviour of the turbulent energy balance, particularly the major role of turbulent transport; and (e) the behaviour of the turbulent length scales of the active coherent motions (the dominant eddies responsible for vertical transfer near the top of the canopy).It is predicted that these length scales are controlled by the shear length scale L = U(h) U'(h) (where h is canopy height, U (z) is mean velocity as a function of height z, and U' = dU dz). In particular, the streamwise spacing of the dominant canopy eddies is = mLs, with m = 8.1. These predictions are tested against many sets of field and wind-tunnel data. We propose a picture of canopy turbulence in which eddies associated with inflectional instabilities are modulated by larger-scale, inactive turbulence, which is quasi-horizontal on the scale of the canopy.
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Code-barres Cote Support Localisation Section Disponibilité ART-6793-0 ART Document imprimé Bureau chercheur Bureau de ANSELMET, Fabien Disponible Journal of geophysical research, Vol.99 No.D8. The Landes experiment : biosphere - atmosphere exchanges of ozone and aerosol particles above a pine forest / E. Lamaud
in Journal of geophysical research
Titre de série : Journal of geophysical research, Vol.99 No.D8 Titre : The Landes experiment : biosphere - atmosphere exchanges of ozone and aerosol particles above a pine forest Type de document : articles et extraits Auteurs : E. Lamaud, Auteur ; Y. Brunet, Auteur ; A. Druilhet, Auteur ; J. Fontan, Auteur ; A. Labatut, Auteur ; A. Lopez, Auteur Année de publication : 1994 Importance : p.16511-16521 Langues : Français (fre) Résumé : An experiment was conducted in a pine forest in southwestern France during late spring 1992. The aim was fourfold: testing various flux measurement methodologies for chemically reactive species; quantifying the exchanges between the forest and the atmosphere; analyzing the involved mechanisms; and studying their influence on the chemistry of the surface boundary layer. This paper presents preliminary results obtained on the dry deposition of ozone and submicronic aerosol particles, measured using eddy correlation. Once properly normalized, the spectra and cospectra of all scalar species exhibit universal shapes over the whole frequency range. However, evidence is provided that under some meteorological conditions the time series of turbulent variables can be affected by nonstationary trends, or low-frequency fluctuations that do not contribute to vertical transfer but whose presence can induce large errors in the calculated fluxes. The time variations of the deposition velocities for ozone and aerosol particles are then presented over 2 days with different meteorological conditions. The deposition velocities are shown to be consistent with other reported studies. Dry deposition of ozone appears to be mainly governed by the stomatal resistance, whereas friction velocity and atmospheric instability in the boundary layer seem to govern the deposition of aerosol particles.
in Journal of geophysical research
Journal of geophysical research, Vol.99 No.D8. The Landes experiment : biosphere - atmosphere exchanges of ozone and aerosol particles above a pine forest [articles et extraits] / E. Lamaud, Auteur ; Y. Brunet, Auteur ; A. Druilhet, Auteur ; J. Fontan, Auteur ; A. Labatut, Auteur ; A. Lopez, Auteur . - 1994 . - p.16511-16521.
Langues : Français (fre)
Résumé : An experiment was conducted in a pine forest in southwestern France during late spring 1992. The aim was fourfold: testing various flux measurement methodologies for chemically reactive species; quantifying the exchanges between the forest and the atmosphere; analyzing the involved mechanisms; and studying their influence on the chemistry of the surface boundary layer. This paper presents preliminary results obtained on the dry deposition of ozone and submicronic aerosol particles, measured using eddy correlation. Once properly normalized, the spectra and cospectra of all scalar species exhibit universal shapes over the whole frequency range. However, evidence is provided that under some meteorological conditions the time series of turbulent variables can be affected by nonstationary trends, or low-frequency fluctuations that do not contribute to vertical transfer but whose presence can induce large errors in the calculated fluxes. The time variations of the deposition velocities for ozone and aerosol particles are then presented over 2 days with different meteorological conditions. The deposition velocities are shown to be consistent with other reported studies. Dry deposition of ozone appears to be mainly governed by the stomatal resistance, whereas friction velocity and atmospheric instability in the boundary layer seem to govern the deposition of aerosol particles.
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Code-barres Cote Support Localisation Section Disponibilité ART-8231-0 ART Document imprimé Bureau chercheur Bureau de PETROFF Alexandre Disponible