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GEOG 1350 (22)
Chapter 6

Chapter 6: Snow Avalanches

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University of Guelph
GEOG 1350
Jaclyn Cockburn

Chapter 661 Intro to Snow AvalanchesAvalanches are rapid downslope movements of snow ice rock or soilSnow Avalanches are masses of snow generally more than a few cubic metres in volume that separate from the intact snowpack and slide or flow downslopey Avalanche may travel as a coherent block or may disaggregate into smaller particles that move independently of one another y Occur in remote uninhabited mountains during fall winter and spring unnoticed y Avalanches are driven by gravity Size RunOut Potential Damage Sluff Small and does not bury a person Relatively Harmless Small Avalanche stops on slope Can bury injure or kill a person size 100m Medium Avalanches goes to bottom of Can bury and destroy a car slope damage a truck destroy small buildings or break trees size 1000m Large Avalanche runs out over areas Can bury and destroy large significantly less steep than 30 trucks and trains large buildings and forested degrees may reach valley bottom areas sixe 1000m and run up the lower part of the opposing slope Snow Climatology y Snow accumulates when temperatures are at or below freezing y Length of snow season depends on latitude and altitude y Great Lakes snow belts accumulate a lot of snow y Amount of snow on ground depends on o Slope of land 45 degrees for snow accumulation o Elevation o Amount of snowfall o WindsAvalanche Initiation
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