Taylor Rowley, ... John D. Vitek, in Advancements in Earth Surchallenge Processes, 2015

13.15 Solifluction

Solifluction (sometimes termed gelifluction in periglacial environments) is the slow-moving flow of saturated soil downslope indicating no frozen ground is existing in the relocating layer (Washburn, 1979). Movement of these saturated soils can be initiated by thawing, creating excess pore-push in the soil, bring about slope activities (Mackay, 1981) (Fig. 13.19). The relief of the slope, depth of thaw, and water content are significant factors in solifluction rates (Walker, 1986; Hjort et al., 2014).You are watching: Throughout which seakid does solifluction occur in the arctic, and why?


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Figure 13.19. Solifluction lobes show saturated conditions on this slope.

You are watching: During which season does solifluction occur in the arctic, and why?

Photo by J. Giardino (2008).

Solifluction reaches its maximum potential in the late spring and summer months once thaw satuprices soils. Saturated soils have enhanced pore pressures, leading to unsecure problems because of a absence of friction and also cohesion. Solifluction have the right to occur on slope much less than 1°, yet it is even more widespread on slope gradients in between 5° and 20°. With even more relief, soil saturation typically decreases as the water drains down the slope as runoff (Walker, 1986). Stvalidated and multilayered slope sediments in the Colorado Front Range are attributed to solifluction (Voelkel et al., 2011). Such deposits will certainly impact the motion of water and also breakthrough of soils.

The solifluction sector is positioned greatly in between 3280 and 6560 ft above sea level, but is also current external these altitudinal levels. Although the slopes are still sometimes acute, the woodland has a propensity to disappear bereason of uncontrolled deforestation, on one hand, and also the damaging effects of some impressive floods throughout the rainy seaboy. Here the phenomenon of solifluction shows up plainly in net-brought red clay soil. The top sectors are influenced by laminar solifluction, which leaves many times an exterior sound rock, yet retains the multifaceted form. Downstream, a mass solifluction shows up, through significant erosion shapes, periodically on the order of even more than 30 ft. Soliflucted material covers the marshy bottoms of these basins (see Fig. 2.4).

Figure 2.4. Coastal mountain array. Landslides because of creeping and also solifluction create a transition of multifaceted to multiconvex forms.

Picture Bergoeing (2009c).

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C. Harris, in Encyclopedia of Quaternary Science (2nd Edition), 2013

Sediment Transport Rates

Measured solifluction carry prices in present-day non-permafrost periglacial areas are generally in between 20 and 50 cm3 cm−1 yr−1, via a maximum cshed to 120 cm3 cm−1 yr−1 (Matsuoka, 2001). In permafrost regions, transfer rates are slightly greater, varying up to 230 cm3 cm−1 yr−1, mostly because of the greater thickness of active layer impacted by plug-favor solifluction. Hence, sediment transport rates because of solifluction are one or even more orders of magnitude better than deliver prices due to soil creep in humid temperate areas. Cutting edge area instrumentation for monitoring of solifluction is explained by Harris et al. (2007) and also Matsuoka (2010).See more: In General, Which Of The Following Gases Would Behave The Many Ideally?

Many hill slopes in the nonglaciated tempeprice zone, such as southerly Britain, present clear evidence of Quaternary periglacial solifluction procedures, both in their slope prorecords and also in their mantle of relict periglacial slope deposits dating to late Pleistocene cold stperiods (Ballantyne and also Harris, 1994).