Caractérisation des mouvements oscillants dans l'atmosphère stable d'une vallée encaissée

Chantal Staquet (1) , Yann Largeron (1) , Charles Chemel (2)

1 LEGI - Laboratoire des Écoulements Géophysiques et Industriels [Grenoble]
2 NCAS Weather

In a valley sheltered from strong synoptic effects, the dynamics of the valley atmosphere at night are dominated by katabatic winds. In a stably stratified atmosphere, these winds undergo temporal oscillations, whose frequency is given by Nsinθ for an infinitely long slope of constant slope angle θ, N being the buoyancy frequency. Such an unsteady flow in a stably stratified atmosphere may also generate internal gravity waves (IGWs).

Domaines: Océan, Atmosphère

Chantal Staquet, Yann Largeron, Charles Chemel. Caractérisation des mouvements oscillants dans l'atmosphère stable d'une vallée encaissée. Symposium OGOA, May 2013, Lyon, France. ⟨hal-00854444⟩