frozen ground or permafrost

thermal talik

a layer or body of unfrozen ground (in a permafrost area) in which the temperature is above 0 degrees Celsius due to the local thermal regime of the ground.
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frozen ground or permafrost

thermal regime of the ground

a general term encompassing the temperature distribution and heat flows in the ground and their time-dependence.
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frozen ground or permafrost

thermal properties of frozen ground

the properties of the ground governing the flow of heat through it, and its freezing and thawing conditions.
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frozen ground or permafrost

thermal pile

a foundation pile on which natural convection or forced circulation cooling systems or devices have been installed to remove heat from the ground.
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frozen ground or permafrost

thermal expansion (or contraction) coefficient

the volume change per unit volume of a substance due to a one degree change in its temperature.
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frozen ground or permafrost

thermal erosion

the erosion of ice-bearing permafrost by the combined thermal and mechanical action of moving water.
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frozen ground or permafrost

thermal diffusivity

the ratio of the thermal conductivity to the volumetric heat capacity.
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frozen ground or permafrost

thermal conductivity

the quantity of heat that will flow through a unit area of a substance in unit time under a unit temperature gradient.
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frozen ground or permafrost

thawing index

the cumulative number of degree-days above 0 degrees Celsius for a given time period.
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frozen ground or permafrost
climatology and meteorology

thawing front

the advancing boundary between thawed ground and frozen ground.
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frozen ground or permafrost

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