Un modèle mécano-empirique pour mieux comprendre la stabilité au vent du hêtre sur plateau calcaire

Abstract : Most of the damages in European forest are done by gales and strong winds. To find out risk factors needs models of wind firmness. We have realised one for the high forests and the coppice with standards from the Lorraine limestone plateau. Since the high rate of windthrow between the damaged trees, only this kind of damages has been taken into account. Our empirical windthrow model was more based on mechanical ideas than current statistical models, which make it original. The creation of a linear relation inspired from Weibull?s model of brittle fracture and of a mechanically based criterion has led to a parsimonious and efficient model, which only needs variables commonly used in forestry. The main windfirmn factors are the product of the crown diameter by the square of the total tree height and the soil depth where limestone appears. Any type of silviculture seems to be more windfirm a priori. The use of a random site effect has largely increased the model quality. Most of the between-site variability may result from the storm site windiness. Improving this data is difficult but could highlight less important factor like silviculture.
Document type :
Master thesis
File URL :
http://docnum.univ-lorraine.fr/prive/SCDSCI_M_2011_BONNESOEUR_VIVIEN.pdf
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https://hal.univ-lorraine.fr/hal-01798084
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Submitted on : Wednesday, May 23, 2018 - 10:27:57 AM
Last modification on : Thursday, September 13, 2018 - 9:32:36 AM

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Vivien Bonnesoeur. Un modèle mécano-empirique pour mieux comprendre la stabilité au vent du hêtre sur plateau calcaire. Sciences de l'environnement. 2011. ⟨hal-01798084⟩

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