Item: Spatial clusters of slab stability and snowpack properties within avalanche start zones
Title: Spatial clusters of slab stability and snowpack properties within avalanche start zones
Proceedings: Proceedings of the 2006 International Snow Science Workshop, Telluride, Colorado
Authors: Cam Campbell and Bruce Jamieson, Department of Civil Engineering, Department of Geology and Geophysics University of Calgary, Calgary, Alberta, T2N 1N4, Canada
Abstract: During the winters of 2000-01 and 2001-02, 36 spatial arrays of closely spaced smallcolumn-type stability tests were performed, each in a day. Each array consisted of 16 to 120, 30 cm by 30 cm test columns arranged in a regular grid pattern, separated by 30 cm in both the up-slope and cross slope directions. The point stability, slab thickness and total snowpack depth data were analyzed with a new spatial clustering technique. Thirty-three percent of the arrays showed significant spatial clusters in either high or low point stability or both, which ranged in length 1.7 m to 3.8 m. Spatial clusters of high or low slab thickness, or both, were identified in 53% of the arrays, ranging in length from 1.7 m to 3.2 m. Spatial clusters in either high or low total snowpack depth were identified in 33% of the arrays, which ranged in length from 1.8 m to 2.7 m. These lengths are the maximum dimension of the clusters and, due to the extent of the arrays, considered to be minima.
Keywords: spatial variability, snow stability, avalanche start zones, clustering, snowpack stratigraphy, avalanche forecasting
Digital Abstract Not Available