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

Georg J. Mayr, Laurence Armi
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.