MONITORAMENTO DE SECAS NA BRETANHA: reconstituição histórica e abordagem por teledetecção

Abstract : Brittany, as many French territories, experiences sometimes drought issues which can vary in intensity and duration. The aim of this study is to determine the impacts of droughts on soil water resources since the early XIXth century. Thus, a soil water balance suited to regional scales was used and applied to different cities of Brittany and surroundings such as Rennes, Plougonvelin and Nantes. The evaporation deficiency obtained at a monthly scale revealed droughts intensity and inter-annual variability. At a yearly scale a positive tendency of the deficiency was noticed. At a monthly scale the inter-annual variability was clearly shown and revealed a 4-year period rhythm with soils lacking of water for one summer month. Finally, we used the NDVI calculated from SPOT-Vegetation images for monitoring the spatial extent of drought in Brittany. For 2003 (the last great drought observed in western France), we found a good relationship between the NDVI and the evapotranspiration but bidirectional reflectance effects, angular values and compositing's procedures may also have a great impact on observed values of NDVI.
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Vincent Dubreuil, Chloé Lamy, Rémi Lecerf, Olivier Planchon. MONITORAMENTO DE SECAS NA BRETANHA: reconstituição histórica e abordagem por teledetecção. Revista Mercator, Universidade Federal do Ceará, 2010, 9 (1), pp.107-119. ⟨10.4215/RM2010.0901.007⟩. ⟨halshs-00561895⟩



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