Solifluction


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solifluction

[¦säl·ə′flək·shən]
(geology)
A rapid soil creep, especially referring to downslope soil movement in periglacial areas. Also known as sludging; soil flow; soil fluction.

Solifluction

 

the flow of wet, finely dispersed soil down a slope resulting from the perennial freezing and thawing of the ground. The flow rate is usually a few centimeters a year; sometimes, in the case of disastrous flows, the flow rate reaches hundreds of meters an hour. The development of solifluction results from decreased ground stability caused by meltwaters and rain and by freezing and thawing. Solifluction occurs primarily in permafrost regions and in regions characterized by seasonal freezing. It is most common on slopes of medium steepness (8°-15°) that have a layer of dispersed beds at least 1.0–2.0 m thick. Slow solifluction develops primarily above the timberline and creates characteristic forms of microrelief, for example, flows and terraces having a tonguelike (parabolic) shape. The classical regions of development of solifluction are the polar and subpolar regions, the Urals, the Chukchi Peninsula, Spitsbergen, and Alaska.

REFERENCES

Kaplina,T. N. Kriogennyesklonovyeprotsessy. Moscow, 1965.
Zhigarev, L. A. Prichiny i mekhanizm razvitiia solifluiuktsü. Mos cow, 1967.

T. N. KAPLINA

References in periodicals archive ?
where we set out to investigate the internal structure of a solifluction lobe.
Solifluction lobes have slid downslope, along the depressions and valleys that incised the cliffs.
The rest is shared by landslides, avalanches, glaciers, solifluction movements, and wind erosion.
A solifluction sheet directly buried level IA without affecting levels II or III.
Below this layer is the Alpine subnival zone, which is divided into an upper layer, with screes, scattered pioneer vegetation, and structural soils, and a lower layer, with dense pastures and controlled solifluction.
Colluvium B and Loess B represent material deposited during and after the Kumara 2 stadial, Colluvium A represents solifluction and erosion product deposited during the Kumara 3 stadial, and Loess A represents loess accumulation subsequent to the Kumara 3 advance.
In this period, eolian and solifluction activity rhythmically alternated.
This phenomenon occurred during particularly warm summers and resulted in increased rates of solifluction on slopes.
Cryogenic consolidation, illuviation, and solifluction
Site B was characterised by a huge solifluction tongue from loamy fine material with loamy, Pergelic Cryaquepts showing scattered vegetation (Table 10) due to an active cryoturbation (Washburn 1980).
A combination of land submergence, coastal erosion, and solifluction had caused the deterioration of certain houses (especially House 3 and House 8) and their assoc iated midden deposits.