Gelifluction within a solifluction lobe in the Kärkevagge valley, Swedish Lapland

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Abstract:

Soil displacement, soil temperature, depths of thaw plane and groundwater level were continuously monitored during the period from July 1999 to June 2000 within a solifluction lobe in the Kärkevagge valley, northern Sweden. The strain–probe method was used to measure soil displacement, and we found significant soil displacements in the thawing period 2000. These displacements were the result of gelifluction. The ice content profile showed that gelifluction occurred at the same time as the thaw plane reached the layers with high ice content at shallow soil depths (0–6 and 16–25 cm deep). In contrast, gelifluction did not occur when the thaw plane reached the layers with high ice content at greater depth (46–49 cm deep). These observations indicate that thawing of ice lenses in the near–surface layer triggers gelifluction.

Keywords: Kärkevagge; gelifluction; ice lens; strain–probe

Document Type: Original Article

DOI: http://dx.doi.org/10.1111/1468-0459.00180

Affiliations: 1: Ibaraki Prefectural Ishige High School, Ibaraki, Japan, 2: Frontier Observational Research System for Global Change, Yokohama, Japan

Publication date: January 1, 2002

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