METHOD TO FORECAST START OF SPONTANEOUS COLLAPSE OF SNOW EAVES ON AVALANCHE-PRONE SLOPES Russian patent published in 2013 - IPC E01F7/04 

FIELD: construction.

SUBSTANCE: method to forecast start of spontaneous collapse of snow eaves on avalanche-prone slopes by means of their visual inspection and detection of length of its cantilever part. Previously above an avalanche-prone site, on an eave-dangerous area, a ridge line is identified and marked with landmarks, and on the windward part of the slope at the distance of 3-10 m below the ridge line, there are safety anchors driven into soil. Then after each snowstorm, having attached themselves through a safety belt to safety anchors, they inspect and measure length of snow eave cantilever with the help of a weight and a reepschnur, for this purpose the weight fixed to the end of the rope is thrown over the edge of the eave, and then pulled to the edge of the eave. Afterwards a point of expected crossing with the ridge line is marked on the reepschnur, and the length of rope is measured in the section between this mark and the weight, then, comparing thus measured length of cantilever part of the snow eave with its permissible limit value for this slope, they forecast the start of spontaneous collapse of snow eave. Installation of landmarks and safety anchors on the ridge primarily takes place in summer period.

EFFECT: improved accuracy of forecasting, efficiency and safety of recreation events holding.

2 cl, 1 dwg