polygon
Link: http://w3id.org/permafrost/v/ipaglossary/t0261
Within: IPA Permafrost Glossary
Definition: Polygons are closed, multi-sided, roughly equidimensional patterned- ground features, bounded by more or less straight sides; some of the sides may be irregular (see Figure 16a, b).
| Term |
polygone
fr
polygon en |
|---|---|
| Comment |
Macro-scale polygons, typically 15 to 30 m across, result from thermal contraction cracking of the ground and form random or oriented polygonal patterns. They occur in both mineral terrain and peatland (see polygonal peat plateau). Ice- wedge polygons are common in poorly drained areas and may be either high- centred or low-centred. Sand-wedge polygons occur where wedges of primary mineral infill underly the polygon boundaries. Some polygons may be formed by seasonal frost cracking in areas of deep seasonal frost. Micro-scale polygonal patterns, usually less than 2 m in diameter, are normally caused by desiccation cracking.
en
|
| dcterms:source |
https://doi.org/10.4224/20386561
xsd:anyURI
|
| skos:altLabel |
frost-crack polygon
en
frost polygon en |
| skos:hiddenLabel |
depressed-centre polygon
en
tundra polygon en raised-centre polygon en fissure polygon en Taimyr polygon en |