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. In modelling the wildfire behaviour, good knowledge of the mechanisms andthe kinetic parameters controlling the thermal decomposition of forest fuelis of great importance. The kinetic modelling is based on the mass-loss rate,which defines the mass-source term of combustible gases that supply theflames and influences the propagation of wildland fires. In this work, weinvestigated the thermal degradation of three different fuels using amulti-scale approach. Lab-scale experimental diagnostics such as thermogravimetric analysis (TGA),differential scanning calorimetry (DSC), use of the cone calorimeter (CC) or FirePropagation Apparatus (FPA) led to valuable results for modelling thethermal degradation of vegetal fuels and allowed several upgrades ofpyrolysis models. However, this work remains beyond large-scale conditions of a wildland orforest fire. In an effort to elaborate on the kinetic models under realisticnatural fire conditions, a mass-loss device specifically designed for thefield scale has been developed. The paper presents primary results gainedusing this new device, during large-scale experiments of controlled fires.The mass-loss records obtained on a field scale highlight the influence of thechemical composition and the structure of plants. Indeed, two species withsimilar chemical and morphological characteristics exhibit similarmass-loss rates, whereas the third presents different thermal behaviour. The experimental data collected at a field scale led to a new insightabout thermal degradation processes of natural fuel when compared to thekinetic laws established in TGA. These new results provide a globaldescription of the kinetics of degradation of Mediterranean forest fuels.The results led to a proposed thermal degradation mechanism that has alsobeen validated on a larger scale.

New experimental diagnostics in combustion of forest fuels: microscale appreciation for a macroscale approach