GPHY 102 Lecture Notes - Lecture 25: Periglaciation, Thermokarst, Permafrost

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GPHY 102 Full Course Notes
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GPHY 102 Full Course Notes
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Document Summary

Periglacial landforms: associated with cold climates, particularly in high latitude and elevation locations, processes associated with free-thaw and permafrost dominated and result in a distinctive suite of landform types. Permafrost: one of the key features of periglacial landscapes is permafrost, defined as ground material that remains frozen for two or more years, found in zones where it is localized (discontinuous) or continuous. In some cases, it is found below arctic coasts formed in the past when sea levels were lower. Permafrost types: permafrost can be composed of rock, soil or ice, in any combination, usually, the processes we are concerned with in periglacial landscapes to ground ice of various types. Pore ice that fills void space in soils. Massive ice that forms distinct bodies of ice, often of substantial thickness. The active layer: each summer, the upper ground thaws to some depth, a zone called the. Active layer: the thickness may vary depending on weather in a given year.

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