| Title | Measuring spatial variations of weak layer and slab properties with regard to snow slope stability |
| Author | Bellaire, S.; Schweizer, J. |
| Author Affil | Bellaire, S., WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland |
| Source | Cold Regions Science and Technology, 65(2), p.234-241, . Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0165- 232X |
| Publication Date | Feb. 2011 |
| Notes | In English. 32 refs. GeoRef Acc. No: 309492 |
| Index Terms | avalanches; layers; mass movements (geology); mechanical properties; penetrometers; slope stability; snow; statistical analysis; microstructure; geostatistics; layered materials; mass movements; natural hazards; probability; risk assessment; sampling; spatial variations; ultrastructure |
| Abstract | Spatial variations of weak layer and slab properties are believed to affect snow slope stability. To quantify spatial variability at the slope scale, penetration resistance was measured with a high- resolution snow micro-penetrometer (SMP) in a partly randomized grid pattern. The grid design consisted of 46 SMP measurement locations. In addition, a full snow profile and 20 compression tests as well as a Rutschblock test at the snow profile location were performed within the grid. Fifteen slopes of different aspects were sampled of which 11 could be analysed. Weak layer and slab properties were characterised using non- spatial as well as spatial statistics and results were related to slope stability. The geostatistical analysis revealed that in more than half of the cases a range could be determined. Slab layers tended to have more spatial structure than the weak layer. Though some trends are apparent, firm conclusions on the dependence of slope stability on spatial variations were not possible due to the limited range of snow conditions in the dataset, and the fact that the definition of slope stability remains elusive. Based on our limited data set, we can therefore not specify the conditions when spatial variations of weak layer and slab properties are most relevant for snow slab release. |
| URL | http://hdl.handle.net/10.1016/j.coldregions.2010.08.013 |
| Publication Type | journal article |
| Record ID | 65006615 |