Velocity profile inversion in dense avalanche flow

Cambridge

2010

S. 27-31

Bandaufführung

10544S

159621

We present a velocity time series of a dry-mixed real-scale avalanche that was recorded at different heights on a mast in the VallÖee de la Sionne avalanche test site. The dataset is of extraordinary quality in terms of completeness and spatio-temporal resolution, and allows the evolution of distinct flow phases of the avalanche to be traced. In particular, we found velocity profile inversions at the transition from the avalanche front to the avalanche body. We provide a tentative empirical description of the profile inversions and briefly discuss our observations in the light of theoretical considerations.