thaw bulb
Link: http://w3id.org/permafrost/v/ipaglossary/t0340
Within: IPA Permafrost Glossary
Definition: A zone of thawed ground below or surrounding a man-made structure placed on or in permafrost and maintained at temperatures above 0°C (see Figure 23).
| Term |
thaw bulb
en
bulbe de dégel fr |
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| Comment |
Construction and operation of structures usually lead to alteration of the thermal regime of the ground. Where permitted, the development of a thaw bulb under a structure is taken into account and controlled as part of the engineering design. It is frequently nearly symmetrical in form and limited in size under structures such as buildings. Beneath linear structures or facilities built in permafrost areas, such as road embankments or buried warm pipelines, the thaw bulb may extend for the full length of the structure. Settlement of the ground and the structure or facility may occur as the thaw bulb forms. A thaw bulb may also form when a structure or facility, around which a frost bulb has developed, is abandoned and the ground is no longer maintained at a temperature below 0°C.
en
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| dcterms:source |
https://doi.org/10.4224/20386561
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