The aim of this paper is to describe the surveys techniques, used at the Seehore avalanche test site located in Aosta Valley (NW Italy), concerning the snow erosion and deposition due to avalanches and the preliminary results obtained during the first operative seasons. The following approaches are used: ‐ the laser scanner technique: the data recorded during two experiments are analyzed in order to assess the influence of the morphology of the test site (slope angle) on deposition. Analytical models (the cohesive-frictional and Pouliquen ones) are applied to explain the correlation between the slope angle and the snow depth in the runout area; ‐ the straw test: this new field test is devised to evaluate the net erosion/deposition processes using a very cheap and quick method based on the number and on the position of plastic straws placed within the snow cover. The test is used in the analysis of the eroded and deposited snow along the avalanche track, in particular close to the obstacle,, which was built in the experimental site and was impacted by the avalanches; ‐ the RAMMS simulations: a comparison between the model outputs and the experimental data is made focusing the attention on the eroded areas and on the deposition zones; ‐ the manual measurements of the snow depth through a probe: they allow the evaluation of the deposition depth and the involved snow volume.
Different Surveys Techniques to Assess the Snow Erosion and Deposition at the Punta Seehore Test Site
MAGGIONI, MARGHERITA;GODONE, DANILO FRANCESCO;FREPPAZ, Michele
2012-01-01
Abstract
The aim of this paper is to describe the surveys techniques, used at the Seehore avalanche test site located in Aosta Valley (NW Italy), concerning the snow erosion and deposition due to avalanches and the preliminary results obtained during the first operative seasons. The following approaches are used: ‐ the laser scanner technique: the data recorded during two experiments are analyzed in order to assess the influence of the morphology of the test site (slope angle) on deposition. Analytical models (the cohesive-frictional and Pouliquen ones) are applied to explain the correlation between the slope angle and the snow depth in the runout area; ‐ the straw test: this new field test is devised to evaluate the net erosion/deposition processes using a very cheap and quick method based on the number and on the position of plastic straws placed within the snow cover. The test is used in the analysis of the eroded and deposited snow along the avalanche track, in particular close to the obstacle,, which was built in the experimental site and was impacted by the avalanches; ‐ the RAMMS simulations: a comparison between the model outputs and the experimental data is made focusing the attention on the eroded areas and on the deposition zones; ‐ the manual measurements of the snow depth through a probe: they allow the evaluation of the deposition depth and the involved snow volume.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
