Effects of small scale heterogeneity of vegetation on radiative transfer in forest fire [Abstract]

Pimont François, Dupuy Jean-Luc, Scarella Gilles, Caraglio Yves, Morvan Dominique. 2006. Effects of small scale heterogeneity of vegetation on radiative transfer in forest fire [Abstract] Forest Ecology and Management, 234 (suppl.), Résumé, S88 International Conference on Forest Fire Research, Figueira da Foz, Portugal, 27 Novembre 2006/30 Novembre 2006.

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Résumé : Wildland fires are driven by vegetation which is a medium that can be very heterogeneous at several scales. These heterogeneities from shoot to stand levels are likely to affect fire behavior. In the context of theoretical fire modelling, we investigated the effects of departure from randomness in radiative transfer. A methodology derived from approach in other turbid media for solar radiation was adapted to our problem. From several Mediterranean fuel type calculations, conditions on vegetation parameters that provide heterogeneity effects were exhibited. Fuel description was done from field measurements and plant architecture modelling. Results show that both a strong spatial variation in fuel distribution and vegetation dense enough were required to provide heterogeneity effects. The combined effect of fuel surface area, cover fraction and heterogeneity size was studied. Radiative transfer in heterogeneous maritime pines and dense shrub stands is shown to be very significantly affected by heterogeneity. On the contrary, lower effects are expected from Aleppo pine and light shrub fuel distributions. Further work will determine the appropriate resolution scale for vegetation description of each species and a way to take into account heterogeneity when no detailed information is available on fuel distribution. © 2006 Published by Elsevier B.V.

Classification Agris : F62 - Physiologie végétale : croissance et développement
K10 - Production forestière

Axe stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations

  • Pimont François, INRA (FRA)
  • Dupuy Jean-Luc, INRA (FRA)
  • Scarella Gilles, INRA (FRA)
  • Caraglio Yves, CIRAD-AMIS-UMR AMAP (FRA)
  • Morvan Dominique, Université d'Aix-Marseille II (FRA)

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