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Caractérisation macroscopique du milieu végétal pour les modèles physiques de feux de forêts

Abstract : The macroscopic and gigascopic scale description of forest fires allows physical modelings of the propagation which can predict the fire evolution with a better accuracy than usually developed empirical Rothermel-like models. However, those models need fitting for their parameters which cannot be measured directly as the models equations are related to the equivalent media at the considered scale and not related to the air and the vegetal material. The equivalent media properties are related to the inner media properties, but the inner media properties knowledge does not allow directly the equivalent media properties knowledge. This work is then aiming on the vegetal medium reconstruction using fractal geometry. Geometrical parameters measurement methods used in forestry sciences are applied for the vegetal modeling validation. Numerical studies are finally done on the reconstructed structures to fit the relevant macroscopic scale parameters. Those studies also allow us to validate or invalidate the assumptions which have been done for the equivalent medium equation development. Those parameters are: the equivalent medium viscosity, the convective heat transfer coefficient and the extinction coefficient
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  • HAL Id : tel-01753043, version 1



Aymeric Lamorlette. Caractérisation macroscopique du milieu végétal pour les modèles physiques de feux de forêts. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL044N⟩. ⟨tel-01753043⟩



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