thermokarst depression

thermokarst depression
   A hollow in the ground resulting from subsidence following the local melting of ground ice in a permafrost region.

Glossary of landform and geologic terms. 2013.

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  • Thermokarst — refers to a land surface that forms as ice rich permafrost melts. It occurs extensively in Arctic areas, and on a smaller scale in mountainous areas such as the Himalayas and the Swiss Alps. The name is given to very irregular surfaces of marshy… …   Wikipedia

  • thermokarst pit —    Steep walled depression formed by thermokarst processes [10] …   Lexicon of Cave and Karst Terminology

  • alas —    A type of thermokarst depression with steep sides and a flat, grass covered floor, found in thermokarst terrain, produced by thawing of extensive areas of very thick and exceedingly ice rich permafrost.    Compare: thermokarst depression.… …   Glossary of landform and geologic terms

  • Alass — Dépression lacustre d’origine thermokarstique dans le pergélisol. Au Québec, l expression lac de thermokarst est préférée[1]. Le réchauffement des basses couches de l atmosphère favorise la fonte du pergélisol et le développement de ces lacs dans …   Wikipédia en Français

  • permafrost — /perr meuh frawst , frost /, n. (in arctic or subarctic regions) perennially frozen subsoil. Also called pergelisol. [1943; PERMA(NENT) + FROST] * * * Perennially frozen earth, with a temperature below 32 °F (0 °C) continuously for two years or… …   Universalium

  • cryokarst —    1. A non karstic term. Land surface with closed depression (usually small and shallow) formed by alternate freezing and thawing of permafrost or ground ice overlying different rock, including limestone. The term ‘cryokarst’ is more common in… …   Lexicon of Cave and Karst Terminology