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     <dc:title xml:lang="fr">Simulations numériques et mesures de terrain d'évènements gélifs dans un vignoble équipé de tours antigel : application au vignoble de Quincy</dc:title>
     <dcterms:alternative xml:lang="en">Numerical simulations and field measurements of frost events in a vineyard equipped with wind machines : application to the Quincy vineyard</dcterms:alternative>
     <dc:subject xml:lang="fr">gel</dc:subject>
<dc:subject xml:lang="fr">vignoble</dc:subject>
<dc:subject xml:lang="fr">tour antigel</dc:subject>
<dc:subject xml:lang="fr">mesure</dc:subject>
<dc:subject xml:lang="fr">statistique</dc:subject>
<dc:subject xml:lang="fr">modélisation</dc:subject>
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<dc:subject xml:lang="en">vineyard</dc:subject>
<dc:subject xml:lang="en">wind machine</dc:subject>
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     <dcterms:abstract xml:lang="fr">Cette thèse présente les travaux réalisés sur la caractérisation de la tour antigel comme moyen de lutte contre le gel de printemps dans le vignoble de Quincy. Des études statistiques ont été menées à partir d’un réseau de capteurs de températures disséminés à travers le territoire et des données synoptiques et topographiques. Elles ont permis de mettre en lumières les zones les plus gélives dans le vignoble de Quincy et d’apporter un regard critique sur l’actuelle implantation des 60 tours antigel dotant le vignoble. Des mesures de terrain ont été menées afin de caractériser le débit et flux de quantité de mouvement du jet produit par cinq tours antigel différentes. Les résultats montrent que malgré les différents designs, les propriétés des tours sont équivalentes. Une mesure inédite de l’action combinée de la tour antigel et d’un brûleur lors d’une nuit de gel montre que le brûleur a une contribution intense dans le réchauffement de la température mais si brève que des questions subsistent sur sa rentabilité. Enfin, en travail exploratoire, un modèle numérique LES d’une nuit de gel radiatif a été développé afin de simuler l’action de la tour antigel par le moyen d’un disque actuateur.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">This thesis presents the work conducted on the characterization of the wind machine as a means of controlling spring frost in the vineyard of Quincy. Statistical studies were conducted using a network of temperature sensors spread across the territory along with synoptic and topographic data. They allowed to highlight the most frost sensitive areas in the Quincy vineyard and to provide a diagnostic on the actual implementation of the 60 wind machines in the vineyard. Field measurements were conducted to characterize the flow rate and momentum of the jet produced by five different wind machines. The results show that despite the different designs, the properties of the towers are equivalent. A pioneer measurement of the combined action of the wind machine and a burner during a frost night showed that the burner had an intense contribution in warming the temperature but so brief that questions remain about its profitability. Finally, as an exploratory work, an LES numerical model of a night of radiative frost has been developed to simulate the action of the wind machine using an actuator disk.</dcterms:abstract>
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