Variation de la vitesse du vent a l'interieur et au-dessus d'une vigne

Abstract Horizontal wind speed profiles above and within rows of vineyard can be represented by a one-dimensional model in a limited zone within the boundary layer and they can be expressed with the attenuation coefficient of Cionco and zero-plane displacement. The two zones with different roughness lengths are not observed. Wind direction effects are especially evident inside the canopy and the data indicate that the usual flux profile relationships are not valid for mass and heat fluxes.