Articles
ORCHARD-ATMOSPHERE PHYSICAL EXCHANGES: MODELLING THE CANOPY AERODYNAMICS
Article number
416_21
Pages
177 – 182
Language
Abstract
Measurements of wind speed at several heights were conducted in a peach orchard to determine some aerodynamic characteristics of the tall vegetation canopy.
Wind speed profiles computed from the data collected above and within the tree canopy, where leaf vertical distribution was mainly concentrated at the top, were analysed in near-neutral atmospheric conditions.
The roughness of canopy elements induced a distortion of the logarithmic wind profile that was all the more marked the lower the wind speed.
Within the canopy, the wind speed profile was strongly affected by canopy architecture, and the exponential relationship of air-flow attenuation with depth was confirmed throughout the measured wind-speed range.
The canopy-specific attenuation coefficient showed a direct dependence on the morphological features of the vegetative surface.
A linear parameterization allowed to describe with a good degree of confidence the wind profile, once applied to the transition layer.
The estimation of aerodynamic characteristics of tall vegetation by means of these simple method can lead to strong simplifications in modelling the whole orchard time-scale evolution during the vegetative grown.
In particular, fluxes of physical quantities, such as latent and sensible heat fluxes, could be easily determined with low man-time consumption and low-cost instrumentation.
Wind speed profiles computed from the data collected above and within the tree canopy, where leaf vertical distribution was mainly concentrated at the top, were analysed in near-neutral atmospheric conditions.
The roughness of canopy elements induced a distortion of the logarithmic wind profile that was all the more marked the lower the wind speed.
Within the canopy, the wind speed profile was strongly affected by canopy architecture, and the exponential relationship of air-flow attenuation with depth was confirmed throughout the measured wind-speed range.
The canopy-specific attenuation coefficient showed a direct dependence on the morphological features of the vegetative surface.
A linear parameterization allowed to describe with a good degree of confidence the wind profile, once applied to the transition layer.
The estimation of aerodynamic characteristics of tall vegetation by means of these simple method can lead to strong simplifications in modelling the whole orchard time-scale evolution during the vegetative grown.
In particular, fluxes of physical quantities, such as latent and sensible heat fluxes, could be easily determined with low man-time consumption and low-cost instrumentation.
Publication
Authors
T. Georgiadis, E. Dalpane, F. Rossi, F. Nerozzi
Keywords
Online Articles (37)