A simple wind–tree interaction model predicting the probabilityof wind damage at stand level
Language
en
Article de revue
This item was published in
Agricultural and Forest Meteorology. 2016, vol. 224, p. 49-63
Elsevier Masson
English Abstract
Forest wind damage occurs under the passage of strong intermittent wind gusts at tree level. In order topredict the probability of tree damage of a forest, a simple statistical wind speed model was developed and coupled ...Read more >
Forest wind damage occurs under the passage of strong intermittent wind gusts at tree level. In order topredict the probability of tree damage of a forest, a simple statistical wind speed model was developed and coupled to a tree swaying model. The wind model is based on a stochastic approach and on some universal characters of normalized wind statistics at canopy top. This model aims at generating high frequency (10 Hz) time series of the three wind velocity components at canopy top knowing only the wind intensity from a nearby meteorological station and the height and cumulative plant area index of the forest. Compared to field measurements and large-eddy simulations over different canopy structures and densities, the wind model was able to reproduce accurately the main features of canopy-top wind dynamics, in particular the signature of the mixing-layer type coherent eddy structures developing at canopy top. Coupled with a tree swaying model, the model has allowed to predict the probability of wind damage of forest following the windstorm intensity and duration, and following the main tree characteristics resulting from silvicultural scenarios. By responding to some weaknesses of existing mechanistic wind risk models, this simple wind–tree interaction model may represent the first step toward a new generation of mechanistic wind risk models based on a probabilistic approach.Read less <
Keywords
dégât dû au vent
approche stochastique
modèle probabiliste
caractéristique du couvert
English Keywords
forest wind damage
stochastic wind model
tree motion
wind risk
wind damage
probabilistic model
Origin
Hal imported