thaw tube
Link: http://w3id.org/permafrost/v/illustrateddictionary/thawtube
Within: An Illustrated Permafrost Dictionary
Definition: A device installed in the ground to monitor the annual thickness of the active layer.
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thaw tube
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| Comment |
Did you know? One type of thaw tube is filled with water and inserted vertically into a hole drilled into the permafrost. A coloured bead placed in the tube descends to the boundary between water and ice, and at the end of summer, it refreezes and marks the base of the active layer.
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| dcterms:source |
https://doi.org/10.52381/CPA.permafrostdictionary.1
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