@prefix qx8: . @prefix skos: . qx8:-RNL0WXJ4-2 skos:prefLabel "phénomène physique"@fr, "physical phenomenon"@en ; a skos:Concept ; skos:narrower qx8:-8LBTB3N2-V . qx8: a skos:ConceptScheme . qx8:-8LBTB3N2-V skos:exactMatch , , ; skos:definition "L'advection est le transport d'une quantité (scalaire ou vectorielle) d'un élément donné (tel que la chaleur, l'énergie interne, un élément chimique, des charges électriques) par le mouvement (et donc la vitesse) du milieu environnant. C'est une notion courante en mécanique des fluides car toutes les caractéristiques d'une particule fluide sont advectées lors de son déplacement au sein de l'écoulement. Dans l'équation de Navier-Stokes, l'advection du vecteur vitesse apparaît dans le terme d'inertie, qui correspond à l'advection de la quantité de mouvement. En météorologie et en océanographie, l'advection se réfère surtout au transport horizontal de certaines propriétés par les fluides considérés, dont le transport par le vent ou les courants : advection de vapeur d'eau, de chaleur, de salinité, etc. Le phénomène d'advection est entièrement codé dans l'équation de conservation. (Adapté de : https://fr.wikipedia.org/wiki/Advection)"@fr, "In the field of physics, engineering, and earth sciences, advection is the transport of a substance or quantity by bulk motion of a fluid. The properties of that substance are carried with it. Generally the majority of the advected substance is also a fluid. The properties that are carried with the advected substance are conserved properties such as energy. An example of advection is the transport of pollutants or silt in a river by bulk water flow downstream. Another commonly advected quantity is energy or enthalpy. Here the fluid may be any material that contains thermal energy, such as water or air. In general, any substance or conserved, extensive quantity can be advected by a fluid that can hold or contain the quantity or substance. During advection, a fluid transports some conserved quantity or material via bulk motion. The fluid's motion is described mathematically as a vector field, and the transported material is described by a scalar field showing its distribution over space. Advection requires currents in the fluid, and so cannot happen in rigid solids. It does not include transport of substances by molecular diffusion. In meteorology and physical oceanography, advection often refers to the transport of some property of the atmosphere or ocean, such as heat, humidity (see moisture) or salinity. Advection is important for the formation of orographic clouds and the precipitation of water from clouds, as part of the hydrological cycle. (Adapted from: https://en.wikipedia.org/wiki/Advection)"@en ; a skos:Concept ; skos:prefLabel "advection"@fr, "advection"@en ; skos:inScheme qx8: ; skos:broader qx8:-RNL0WXJ4-2 .