Modélisation des hétérogénéités de la réserve utile et du développement des cultures au sein d'un sous-bassin versant en Midi-Pyrénées

Abstract : One of the challenges in crop modelling is to understand and be able to reproduce heterogeneities in crop development at intra-plot scale in order to better predict the yield. The aim of this work was to suggest a method for spatializing the input data of crop models, in particular the water stock accessible to plants, in order to reproduce the differences in crop development within a subwatershed. This work was carried out in 3 main steps: (1) adaptationof the STICS crop model to the local context, (2) spatialization of the inputs by the spatial correlation method (SCORPAN-like method) and (3) evaluation of the simulated spatialization with STICS model. Prior to spatialization step, it was necessary to identify the determinants of vegetation heterogeneities observed within the experimental subwatershed. A preliminary study led to delimit the situations that could be reproduced by the model and to identify variables that could be spatialized as well as to define an optimal strategy to spatialize the inputs. Based on this, a methodological work was established to evaluate and parameterize the model without spatialization (local approach) in a context of soils with vertisolic properties. Particularity of local soils properties underlined the need to define a new domain of model validity. Moreover, the protocol used to measure water holding capacity, implied a needful and important step that was to determine the propagation of measurement uncertainty in the model. Finally, thanks to statistical spatialization of measurements, STICS model was used on 8 x 8 m meshes to simulate vegetation development on the whole studied subwatershed.
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Enguerrand Burel. Modélisation des hétérogénéités de la réserve utile et du développement des cultures au sein d'un sous-bassin versant en Midi-Pyrénées. Sciences de la Terre. Université Paul Sabatier - Toulouse III, 2018. Français. ⟨NNT : 2018TOU30336⟩. ⟨tel-02314042⟩

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