Avalanches - Brady

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Avalanches:

Avalanches Submitted to: Mr. Stirling Submitted by: Brady Mouland

What Are Avalanches and How Do They Occur?:

What Are Avalanches and How Do They Occur? An avalanche is a sudden, extreme flow of snow usually down the slop of a mountain. Avalanches occur when either natural triggers such as large amounts of snow, or artificial triggers such as snowmobiles cause snow to flow rapidly down a hill or mountain.

Different Types of Avalanches:

Different Types of Avalanches There are two different types of avalanches. They are : 1.) Surface Avalanches : These occur when a layer of snow slides over another layer of snow. 2.) Full-Depth Avaanches : These occur when an entire depth of snow from the earth to the surface slides down hill.

Where do Avalanches Mainly Occur?:

Where do Avalanches Mainly Occur? Avalanches are most commonly found in mountainous regions. Almost all avalanches occur on slopes of 30° to 45°. Avalanches commonly occur in the countries of France, Austria, Switzerland, and Italy. Very few avalanches occur on hills or on slopes of less than 30°.

Parts of an Avalanche:

Parts of an Avalanche There are three parts to an avalanche. They are: 1.) Fracture Zone: The starting point of an avalanche. 2.) Path: The path of an avalanche. 3.) Deposition Zone: Where the avalanche runs out and finally stops.

Methods to Help Prevent Avalanches:

Methods to Help Prevent Avalanches Snow fences prevent the build-up of snow in fracture zones. Plant many trees on hillsides, scattered enough to slow down and break up any snow flow from above. Use explosives to loosen up small build-ups of snow.

Other Interesting Facts:

Other Interesting Facts On average, 250 000 avalanches occur each year in Europe alone. Each year avalanches claim more than 150 lives world wide. In 90% of avalanche accidents, the victim, or someone within the victim's party triggered the avalanche.

Bibliography:

Bibliography http://en.wikipedia.org/wiki/Avalanche http://environment.nationalgeographic.com/environment/natural-disasters/avalanche-profile/ http://geography.about.com/od/physicalgeography/a/avalanches.htm http://www.dosomething.org/tipsandtools/11-facts-about-avalanches http://www.ehow.com/how_4914618_prevent-avalanches.html http://www.naturaldisasters.ednet.ns.ca/Projects/Avalanche/bja.htm http://www.planat.ch/en/knowledge-base/avalanche/diagram-lw/