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Spatialisation du statut hydrique de la vigne sur un bassin versant méditerranéen par télédétection optique

Abstract : Vineyard hydric status is recognized as an essential factor for wine-producing. At the field scale, research work allowed to develop different methods for hydric status characterization. However, because of tedious implementation, these methods are useless at the watershed scale, whereas hydric status information at this scale is strongly needed. The main objective of this study is to spatialize vineyard hydric status over a Mediterranean watershed. The study site is located in the basse vallée de la Peyne, a 65 km2 wine-producing area, that is representative of the Mediterranean vineyards. The general procedure to achieve this objective was to spatialize actual evapotranspiration (ET), choose as an hydric status indicator, using two spatialized models (S-SEBI Roerink et al., 2000 and WDI, Moran et al., 1994) that were derived from thermal infrared remote sensing imagery (ASTER sensor). The results of these models were validated by comparison with local ET measurements and simulations. These simulations performed by a water transfer model HYDRUS-1D, (Simunek et al., 1998), represents an original validation method to obtain local ET over an important number of sites, at a minimal experimental cost. A sensibility study allowed to identify the robustness of these spatialized models to the experimental conditions. After checking that local ET simulations obtained by the HYDRUS-1D approach were correctly simulated, we showed that S-SEBI and WDI spatialized models allowed to estimate ET with satisfactory accuracies. The more empiric S-SEBI model produced better results than the WDI model (RMSE about 0.8 mm.d-1 and 1.1 mm.d-1 respectively). Further, the sensibility study showed that these spatialisation approaches were sensitive to experimental conditions, (spatial extent for S-SEBI and wind speed for WDI). Finally, these spatialisation results depicted for important ET spatio-temporal variability over the Peyne watershed. The spatial patterns retrieved by the two models are similar and seems to be strongly related to pedological and landscape characteristics within the study site.
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  • HAL Id : tel-02824261, version 1
  • PRODINRA : 222675

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Mauricio Galleguillos. Spatialisation du statut hydrique de la vigne sur un bassin versant méditerranéen par télédétection optique. Sciences agricoles. Institut National d'Etudes Supérieures Agronomiques de Montpellier, 2010. Français. ⟨tel-02824261⟩

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