Abstract : A.2
Continuously stratified hydraulics of shallow and deep foehn

Georg J. Mayr, Laurence Armi
georg.mayr@uibk.ac.at
Institute of Meteorology and Geophysics, University of Innsbruck

Shallow and deep alpine foehn flows are analyzed within the framework of continuously stratified hydraulics. A distinguishing upstream feature of these flows is the presence of stagnant, nearly well-mixed layers above and beneath the moving stratified fluid. These layers isolate the moving stratified fluid, which has a self-similar parabolic like velocity distribution, from the stratified fluid above and beneath.

The temporal evolution from shallow to deep foehn and its spatial distribution were captured with a sequence of radiosondes, automatic weather stations, an instrumented car, and research aircraft flights.