, la disponibilité des données d'entrée des modèles, leur degré de précision et leur spatialisation n'est pas homogène et conditionnent donc aussi la mise en oeuvre des modèles et le formalisme des processus étudiés. La problématique de changement d'échelle concerne donc à la fois la modélisation des processus, le niveau de précision des données d'entrée et la déclinaison des scénarios. L'objectif de ce chapitre est avant tout, de mettre en évidence les verrous rencontrés lors du changement d'échelle, appliqué au cas d'étude du site de Kervidy-Naizin (5 km²) et du territoire du Blavet (2140 km²). Les deux modèles utilisés, TNT2 et SENEQUE-RIVERSTRALHER, sont appliqués dans un premier temps à l'échelle du site de Kervidy-Naizin, puis dans un second temps le modèle SENEQUE est appliqué à l'échelle du Blavet. Ces deux applications successives sur un même jeu de scénarios permettent de discuter leur déclinaison et leur évaluation aux deux échelles territoriales. La comparaison des résultats obtenus à petite échelle entre le modèle SENEQUE-RIVERSTRALHER et le modèle TNT2 permet d'appréhender les incertitudes liées au formalisme du modèle SENEQUE-RIVERSTRALHER et d'envisager des perspectives de travaux pour l'améliorer. Ces éléments permettront de « sécuriser, L'évaluation de scénarios visant à réduire les émissions polluantes d'azote, repose sur une gamme d'outils complémentaires. Or, selon la taille du territoire d'étude (échelle du site versus échelle du paysage), les questions des gestionnaires (priorisation d'action à l'échelle régionale ou choix de solutions correctives à l'échelle locale)

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, Architecture de la base de données

I. I. Annexe, Exemple de formulaire de la base de données

I. I. Annexe, Suite exemple de formulaire de la base de données

I. Annexe, Description des règles de pâturage sur Kervidy-Naizin

I. V. Annexe, Comparaison spatiale de l'assolement obtenu par relevé terrain et simulé par le modèle pour l'année 2016

. .. Annexe-v-;-dans-tnt2, Schéma conceptuel du fonctionnement du module CERES-EGC du modèle Nitroscape (Benhamou et al. 2017)

(. Nitroscape and . Benhamou, 188 Annexe VIII : Recensement des bâtiments sur le site de Kervidy-Naizin avec une estimation du nombre d'animaux, 2017.

X. Annexe, Evolution du delta stock de la nappe pour l'ensemble des scénarios

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X. Annexe, Carte de sous-bassins versants du Blavet

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X. Annexe, Indice de couverture automnale : détail des calculs et des scores d'abattement, p.195

, Détail des rotations et des surplus en kgN, p.1

. .. N_bmp), Kervidy-Naizin pour les scénarios « pratiques actuelles » (N_BAU) et « pratiques optimisées