Ice-wedge
A ice-wedge is the shape of massive ice of ground which one finds in the areas of continuous Pergélisol. It results from the freezing of water in slits of thermal rétaction. The seasonal freezing of water on the level of permafrost allows the growth of the ice-wedge which presents a form of bevel typically (of a few centimetres to several meters broad, according to water available and the number of seasonal cycles). The pressure induced by the corner creates pads from and of other. The ice of the ice-wedge can be partially coloured by inclusions of sediments.
In plan, these slits of freezing open by constituting quadrangular or polygonal network irregular, of decametric mesh of order.
During the degradation of permafrost (climate warming), the ice-wedges are subjected to a Thermokarst. They then are frequently widened by collapse or creep of the walls or streaming in the network, the inherited form is then called pseudomorphous of ice-wedge. The slits of freezing released by the cast iron of the ice, can fill of sand, ground or loess.
The ice-wedges, or large slits of freezing , should not be confused with the réseaus of small slits of freezing (in English frost aces ), major and forming a regular polygonal network of a decimetre nature, which do not require the presence of Pergélisol.
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