Sastrugi

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Sastrugi are sharp irregular grooves or ridges formed on a snow surface by wind erosion and deposition, and found in polar and temperate snow regions. They differ from sand dunes in that the ridges are parallel to the prevailing winds. These words are plural: the singular is sastruga or zastruga. The word was taken from Russian.
Sastrugi are sharp irregular grooves or ridges formed on a snow surface by wind erosion and deposition, and found in polar and temperate snow regions. They differ from sand dunes in that the ridges are parallel to the prevailing winds. These words are plural: the singular is sastruga or zastruga. The word was taken from Russian.


Sastrugi are sharp irregular grooves or ridges formed on a snow surface by wind erosion and deposition, and found in polar and temperate snow regions. They differ from sand dunes in that the ridges are parallel to the prevailing winds. These words are plural: the singular is sastruga or zastruga. The word was taken from Russian.

Wind erodes from the windward side of an obstacle and deposits on the lee side. We call the eroded snow sastrugi. You can recognize it by its rough, sand-blasted texture. It is thought that wind eroded snow as being stable because stress on buried weak layers has been decreased by wind eroding the overlying snow. Conversely, wind will deposit that same snow on to the lee slopes, which increases weight on buried weak layers.

[edit] Also See

[edit] Reference

  1. Wikipedia Sastrugi [1]
  2. National Avalanche Center and The Friends of the Utah Avalanche Forecast Center. Sastrugi [2]

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