Titre :	Influence du bocage sur le climat d'une petite région
Type de document :	texte imprimé
Auteurs :	G. Guyot, Auteur ; B. Seguin, Auteur
Année de publication :	1976
Importance :	pp. 121-130
Langues :	Français (fre)
Catégories :	Zone géographique MOREAC (56140) ; REMINIAC (56191) ; SAINT-ARMEL (56205) Habitat (grands milieux) 84 - Alignements d'arbres, haies, petits bois, bocage, parcs et bords de route Thématique Bioclimatologie
Mots-clés :	bocage  microclimat
Résumé :	Influences of hedges networks upon the climate of a small region In a more general frame of a pluridisciplinary study initiated in Britanny (west of France), a specific program was realized by the I.N.R.A. Station de Bioclimatologie d'Avignon-Montfavet in order to establish influences of hedge networks (so called «bocage» ) upon the climate of a small region. That study, based on theoretical studies described elsewhere, consisted of comparative micrometeorological and meteorological measurements taken in adjacent sites (one with the old original landscape of "bocage" and the other where land management operations had led to more or less total destruction of the system of hedges). Results concern, at first, aerodynamic effects corresponding to the modification of air flow by the hedge system, which may be related to the overall aerodynamic roughness corresponding to height and density of obstacles. Then are reported results about radiative balance, which displays no noticeable modification of net radiation, the slight increase in infrared loss being counterbalanced by a similar slight increase in absorbed solar radiation due to a smaller albedo. Concerning air temperature, these combined effects generally induce higher diurnal and lower nocturnal temperatures, then resulting in an increase of thermal amplitude (0°5 to 1.5°C). Similarly, the "bocage" generally induces an increase in air saturation deficit, especially on the sea border (0.5 to 3.0 mb). For potential evapotranspiration PET, while the evaporation of Piche evaporimeter shows a noticeable reduction (about 30%), no marked effect appears on PET itself, which can be explained by the low-weight of the advective term (traduced by Piche indications) in Penman formulation compared to the radiative term in the specific context of Britanny climate.
Type de document :	...
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Influence du bocage sur le climat d'une petite région [texte imprimé] / G. Guyot, Auteur ; B. Seguin, Auteur . - 1976 . - pp. 121-130.
Langues : Français (fre)

Catégories :	Zone géographique MOREAC (56140) ; REMINIAC (56191) ; SAINT-ARMEL (56205) Habitat (grands milieux) 84 - Alignements d'arbres, haies, petits bois, bocage, parcs et bords de route Thématique Bioclimatologie
Mots-clés :	bocage  microclimat
Résumé :	Influences of hedges networks upon the climate of a small region In a more general frame of a pluridisciplinary study initiated in Britanny (west of France), a specific program was realized by the I.N.R.A. Station de Bioclimatologie d'Avignon-Montfavet in order to establish influences of hedge networks (so called «bocage» ) upon the climate of a small region. That study, based on theoretical studies described elsewhere, consisted of comparative micrometeorological and meteorological measurements taken in adjacent sites (one with the old original landscape of "bocage" and the other where land management operations had led to more or less total destruction of the system of hedges). Results concern, at first, aerodynamic effects corresponding to the modification of air flow by the hedge system, which may be related to the overall aerodynamic roughness corresponding to height and density of obstacles. Then are reported results about radiative balance, which displays no noticeable modification of net radiation, the slight increase in infrared loss being counterbalanced by a similar slight increase in absorbed solar radiation due to a smaller albedo. Concerning air temperature, these combined effects generally induce higher diurnal and lower nocturnal temperatures, then resulting in an increase of thermal amplitude (0°5 to 1.5°C). Similarly, the "bocage" generally induces an increase in air saturation deficit, especially on the sea border (0.5 to 3.0 mb). For potential evapotranspiration PET, while the evaporation of Piche evaporimeter shows a noticeable reduction (about 30%), no marked effect appears on PET itself, which can be explained by the low-weight of the advective term (traduced by Piche indications) in Penman formulation compared to the radiative term in the specific context of Britanny climate.
Type de document :	...
Permalink :	https://pmb.bretagne-vivante.org/pmb/opac_css/index.php?lvl=notice_display&id=65