Comparison of measured and simulated snow avalanche velocities

Velocity measurements by means of videogrammetry and pulsed Doppler radar at two selected snow avalanche events are analysed and compared with avalanche simulations. At the test site Vallée de la Sionne (Switzerland) an artificially triggered avalanche was filmed by two synchronised digital video cameras to obtain the front velocity of the avalanche. At the monitoring site Grimming/Multereck (Austria) a spontaneous avalanche was measured by the radar system of the Technical University Graz, which provides valuable velocity records along the avalanche path. The analysis showed that the peak velocity of the simulations within the avalanche track is about 5 m/s lower than observed. However, in the run out zone the measured and calculated values show good correspondence. For this study it was important to apply only the standard parameters to check the level of agreement with the practical application. The objective of this paper is to study the progression of avalanche velocities with the avalanche models SamosAT and ELBA+ in comparison to the field measurements.

[1]  P. Bartelt,et al.  Velocity profile inversion in dense avalanche flow , 2010, Annals of Glaciology.

[2]  Peter Sampl,et al.  Avalanche simulation with SAMOS , 2004, Annals of Glaciology.

[3]  Marc Christen,et al.  RAMMS: numerical simulation of dense snow avalanches in three-dimensional terrain , 2010 .

[4]  P. Gauer,et al.  Possible erosion mechanisms in snow avalanches , 2004, Annals of Glaciology.

[5]  Dieter Issler,et al.  Experimental Information on the Dynamics of Dry-Snow Avalanches , 2003 .

[6]  W. Ammann,et al.  A new Swiss test-site for avalanche experiments in the Vallée de la Sionne/Valais , 1999 .

[7]  Felix Tiefenbacher,et al.  Comparison of avalanche-velocity measurements by means of pulsed Doppler radar, continuous wave radar and optical methods , 2007 .

[8]  Kolumban Hutter,et al.  Dynamic response of granular and porous materials under large and catastrophic deformations , 2003 .

[9]  Betty Sovilla,et al.  Observations and modelling of snow avalanche entrainment , 2002 .

[10]  Betty Sovilla,et al.  Impact pressures and flow regimes in dense snow avalanches observed at the Vallée de la Sionne test site , 2008 .

[11]  F. Dufour,et al.  Photogrammetric avalanche volume measurements at Vallée de la Sionne, Switzerland , 2001, Annals of Glaciology.

[12]  Yves Bühler,et al.  Modeling mass‐dependent flow regime transitions to predict the stopping and depositional behavior of snow avalanches , 2012 .

[13]  P. Burlando,et al.  Field experiments and numerical modeling of mass entrainment in snow avalanches , 2006 .

[14]  Barbara Turnbull,et al.  Observations on powder snow avalanches using videogrammetry , 2004 .

[15]  Horst Schaffhauser,et al.  Avalanche dynamics measurement by pulsed Doppler radar , 2001, Annals of Glaciology.

[16]  Betty Sovilla,et al.  On snow entrainment in avalanche dynamics calculations , 2007 .

[17]  Rudolf Sailer,et al.  Recalculation of an artificially released avalanche with SAMOS and validation with measurements from a pulsed Doppler radar , 2002 .

[18]  Betty Sovilla,et al.  Measurements and analysis of full-scale avalanche impact pressure at the Vallée de la Sionne test site , 2008 .

[19]  Peter Gauer,et al.  On pulsed Doppler radar measurements of avalanches and their implication to avalanche dynamics , 2007 .