Gotowa bibliografia na temat „Ecoulement topographique”
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Rozprawy doktorskie na temat "Ecoulement topographique"
Nasser, Antoine-Alexis. "Advancing the representation of flows along topography in z-coordinate ocean models". Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS446.
Pełny tekst źródłaThe seafloor exerts a major control on ocean circulation. The discrete representation of marine topography in geopotential Ocean General Circulation Models (OGCMs) creates artificial steps that have adverse effects on the simulated circulation. This thesis aims at finding suitable ways to address the adverse effects of stepped topography in z-coordinate OGCMs. Using idealized configurations and exploring the potential of the Brinkman Volume Penalisation (BVP) method, we investigate the sensitivity of modelled currents to the presence of artificial steps along model boundaries. We first address the spurious lateral form drag (or textit{staircase problem}) highlighted by Adcroft and Marshall (1998). We show that staircase-like coastlines (and isobaths) behave as smooth boundaries when applying a textit{true} mirror condition on the boundary flow. The discrete implementation of free-slip using flux-form advection and a symmetric viscous stress tensor actually corresponds to no-slip along stepped topography. The choice of viscous boundary condition should vary with location to capture the retroflection of boundary currents at capes. To become insensitive to stepped topography, numerical models should ideally achieve physical convergence (i.e. the main characteristics of the flow are not affected by increasing spatial resolution while keeping viscous and frictional parameters constant). This convergence can be attained at lower resolution with a careful treatment of discrete momentum advection involving a large stencil. We highlight the impact of momentum advection schemes on the fidelity of simulated downslope currents within an idealised overflow configuration. The BVP method allows to spread the land-ocean interface, by introducing porous cells that are half-land half-ocean. We find that this spreading allows to smooth bottom currents and to reduce spurious mixing during downslope flow. The numerical stability of the BVP can be guaranteed by sufficient spreading of the boundary and by defining permeability (friction within porous cells) in a consistent way. The results underscore the potential of the BVP method to better represent flows along topography in OGCMs
Shen, Zheng. "Quelques considerations sur les ecoulements orographiques". Clermont-Ferrand 2, 1986. http://www.theses.fr/1986CLF2D185.
Pełny tekst źródłaSauquet, Éric. "Une cartographie des ecoulements annuels et mensuels d'un grand bassin versant structuree par la topologie du reseau hydrographique". Grenoble INPG, 2000. http://www.theses.fr/2000INPG0036.
Pełny tekst źródłaTeinturier, Samuel. "Dynamique et stabilité de tourbillons océaniques en interaction avec la cote ou la topographie". Palaiseau, Ecole polytechnique, 2008. https://pastel.archives-ouvertes.fr/tel-00430962.
Pełny tekst źródłaLaroche, Hugues. "Simulations numériques directes des écoulements d'un fluide tournant, ou stratifié en densité de façon stable, autour d'un obstacle". Grenoble 1, 1991. http://www.theses.fr/1991GRE10044.
Pełny tekst źródłaPinto-Bull, Fernando. "Evolution tectono-sédimentaire d'un bloc basculé au cours du Jurassique : le massif du Rochail-Lauvitel ( Alpes occidentales, France) . Sédimentologie, stratigraphie et tectonique synsédimentaire". Phd thesis, Grenoble 1, 1988. http://tel.archives-ouvertes.fr/tel-00509909.
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