File:Turbulence arbre 2 modifié-1.jpg
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[edit]DescriptionTurbulence arbre 2 modifié-1.jpg |
Français : représentation théorique et très simplifiée des turbulences générées en aval d'un arbre par un vent régulier. Par rapport à un système figé la turbulence est modifiée par le balancement de l'arbre (et en réalité de manière bien plus complexe par la percolation du flux dans les branches et feuilles ). Ces turbulences ont une importance pour les microclimats bocagers et forestiers, la circulation aériennes des pollens, d'invertébrés et microorganismes aéroportés, de propagules (ex : spores de mousses, lichens et autres épiphytes), mais aussi de phytohormones et d'odeurs aéroportées (parfum floral qui attire abeilles ou papillons par exemple, ou hormones de stress qui attirent d'autres espèces.). L'arbre est ici facteur de rugosité du paysage. Un buisson, bosquet, haie, ou massif forestiers auront des effets différents, assez importants parfois pour freiner le vent de 5 à 15 % dans la couche des 10 à 20 m au dessus du sol. English: theoretical and highly simplified representation of turbulence generated downstream of a tree by a steady wind. Compared with a fixed turbulence is modified by the swaying of the tree (and in fact much more complex by the percolation of flow in the branches and leaves). Turbulence are important for the hedgerow and forest microclimates, air traffic pollen, invertebrates and microorganisms airborne propagules (eg spores of mosses, lichens and other epiphytes), but also plant hormones and airborne odors ( floral fragrance that attracts bees and butterflies, for example, or stress hormones that attract other species.) |
Date | |
Source | Own work |
Author | Lamiot |
Dessin purement théorique et simplificateur.. La réalité est plus complexe, tridimentionnelle, et temporellement instable.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 11:29, 17 September 2011 | 742 × 876 (137 KB) | Lamiot (talk | contribs) |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop Elements 8.0 Windows |
File change date and time | 13:17, 17 September 2011 |
Color space | sRGB |