(Abbrev. FRST) - Frost describes the formation of thin ice crystals on the ground or other surfaces in the form of scales, needles, feathers, or fans. Frost develops under conditions similar to dew, e
xcept the temperatures of the Earth's surface and earthbound objects falls below 32
The process of alternate freezing and thawing of moisture in soil, rock and other materials, and the resulting effects on materials and on structures placed on, or in, the ground
The process of alternate freezing and thawing of moisture in soil, rock and other materials, and the resulting effects on materials and on structures placed on, or in, the ground.
The process of alternate freezing and thawing of moisture in soil, rock and other materials, and the resulting effects on materials and on structures placed on, or in, the ground. Frost action in soil
s describes the processes of Frost Heave that occurs in the ground during the freezing period, and Thaw Weakening that occurs as the seasonally Frozen Ground thaws. Although it normally refers to seasonal freezing and thawing processes and effects, the term Frost action has also been used to describe the long-term heaving that occurs when soils are subjected continuously to a freezing temperature over a long period of time (years). Frost action contributes to the mechanical weathering (disintegration or breakdown) of soil and rock materials, by frost wedging, Cryoturbation activity, and to the development of cryotexture and cryogenic fabric in soils.
In general, cycles of freezing and thawing of water contained in natural or man-made materials. This is especially applied to the disruptive effects of this action. In geology, two basic types of fros
t action are described: 1) congelifraction, the shattering or splitting of rock material; and 2) congeliturbation, the churning, heaving, and thrusting of soil material.
(Or frost dam.) A ditch constructed to assist the early and rapid freezing of the soil in order to block the seepage of subsurface flow from entering a critical area.
A seasonal frost mound produced through doming of seasonally frozen ground by a subsurface accumulation of water under elevated hydraulic potential during progressive freezing of the active layer
A seasonal frost mound produced through doming of seasonally frozen ground by a subsurface accumulation of water under elevated hydraulic potential during progressive freezing of the active layer.
A seasonal frost mound produced through doming of seasonally frozen ground by a subsurface accumulation of water under high hydraulic potential during progressive freezing of the active layer.
A small mound of soil material, presumed to have been formed by frost action. A type of nonsorted circle; they are commonly found in fine-grained sediments underlain by permafrost, but also occur in n
on-permafrost areas. Or mud boil
A more or less symmetrical zone of frozen ground formed around a buried chilled pipeline or beneath or around a structure maintained at temperatures below 0˚C
A more or less symmetrical zone of frozen ground formed around a buried chilled pipeline or beneath or around a structure maintained at temperatures below 0 degrees Celsius.
The coldest temperature province in C. W. Thornthwaite's 1931 climatic classification. It is the climate of the ice cap regions of the earth, that is, those regions perennially covered with snow and i
ce. It is equivalent to the more commonly used term perpetual frost climate, to the colder of Köppen's (1918) polar climates, and to Nordenskjöld's (1928) high arctic climate.