Products and Effects of Modern Eolian Activity on a Nineteenth-Century Glacier-Pushed Ridge in West Spitsbergen, Svalbard

Riezebos, P. A.; Boulton, Geoffrey; Meer, J.J.M. van der; Ruegg, G.H.J.; Beets, D.J.; Castel, I. I. Y.; Hart, Jane K.; Quinn, I.T.; Thornton, Merijn; Wateren, F.M. van der

doi:10.2307/1551088

Cited by 16 publications

(10 citation statements)

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“…Amounts of aeolian sediment deposited onto snow were measured by clearing either 0.25 m2 (Ross Point) or 1 m2 (Thomsen River) of the surface to a depth of approximately 1 cm, a method used by a number of investigators (e.g. Warren Wilson, 1958;Jahn, 1972;Riezebos et al, 1986). Because sediment accumulations on the snow were generally patchy, areas with the highest concentration visually were chosen for clearance, producing values close to the maxima for the sites.…”

Section: Methodsmentioning

confidence: 99%

Observations of aeolian transport and niveo‐aeolian deposition at three lowland sites, Canadian arctic archipelago

Lewkowicz

Young

1991

Permafrost & Periglacial

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Observations of wind action were made in the late winter, spring and summer at three lowland sites located on Banks Island (1977‐79), Melville Island (1986‐87) and Ellesmere Island (1989‐90). Erosion pin measurements in north‐central Banks Island showed minimal activity on interfluves and the highest rates at a blowout site in an unvegetated sand plain. The timing of aeolian activity during the year depended on the site characteristics. Where the snow cover was incomplete in winter, either because a rugged microtopography resulted in terrain elements protruding above the surface of the snow or because sublimation of snow exposed the ground surface, aeolian transport could occur year‐round. In areas with a flatter microtopography, summer transport took place but deflation was negligible over the winter and niveo‐aeolian deposition was confined to the autumn and spring when the snow cover was patchy. Windblown sediment became spatially concentrated by denivation at some sites and was deposited on slopes as fans or layers up to 8 cm thick. In the years this occurred, the rate of deposition was greater than sediment removal by wash or other processes and, at least in the short term, the form of the slope was changed.

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Section: Methodsmentioning

confidence: 99%

Observations of aeolian transport and niveo‐aeolian deposition at three lowland sites, Canadian arctic archipelago

Lewkowicz

Young

1991

Permafrost & Periglacial

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“…Denudation of push moraines is generally the result of prolonged erosion by wind action and mass-wasting (Riezebos et al 1986). Reconstruction of truncated folds leads to estimates of 15-20 m of surface level lowering, as a minimum.…”

Section: Post-glacial Evolutionmentioning

confidence: 99%

Structure of a Pleistocene push moraine revealed by GPR: the eastern Veluwe Ridge, The Netherlands

Bakker

Meer

2003

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The classic idea on the architecture of the push moraines of The Netherlands is one of imbricated thrusts. This study shows a more complete model of the structural style within a push moraine. We have mapped three glaciotectonic styles using 50 MHz ground penetrating radar (GPR).The moraines are composed of coarse-grained unconsolidated sediments of fluvial and glaciofluvial origin. Maximum penetration depth is about 45 m. In a 12 km cross-section over the eastern Veluwe Ridge we have encountered the following glaciotectonic styles. Style I is found near the former ice margin and consists of imbricated thrust sheets, with thrust planes dipping towards the former glacier. Style II, further away from the glacier, is a combination of folds and thrust structures. The folds have a wavelength of up to 200 m and an amplitude of 40 m. Style III is almost entirely composed of large-scale folds with wavelengths of 400 m maximum. Toward the most distal parts of the ridges the folds flatten out.The study shows that GPR is capable of imaging large-scale glaciotectonic structures, resulting in a factual model of the eastern Veluwe push-moraine architecture and better insight into postglacial denudation amounts and push-moraine genesis.

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“…Derbyshire & Owen, 1996, Gisladottir, et al 2005, Glasser & Hambrey, 2002, Riezobos et al 1986). There are, however, very few estimates of the quantity and characteristics of fine sediments deflated from proglacial areas.…”

Section: Introductionmentioning

confidence: 99%

Dust generation on a proglacial floodplain, West Greenland

Bullard

Austin

2011

Aeolian Research

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The interplay of glacial dynamics, glaciofluvial and aeolian transport in proglacial landscapes plays an important role in local environmental systems and in the global context by affecting the amount of dust generated and transported at different phases of glacial-interglacial cycles. Glacial outwash plains are a significant source of dust, however the processes involved in dust generation on proglacial floodplains are poorly documented. We report a study of the quantity and characteristics of aeolian suspended sediment transport in Sandflugtdalen, a valley containing a proglacial floodplain and aeolian dunefield in West Greenland. Although the surface sediment of both the floodplain and dunefield contain a considerable amount of sand-sized material, wind speeds recorded were insufficiently strong to mobilise this material; this is probably due to the armouring effect of coarser particles in the surface deposits. Nevertheless, fine (dust-sized) aeolian sediments were transported down valley in suspension and the source of this material was a silt-dominated meltwater deposit up valley from the monitoring sites. Dust transport ranged from 0.0008-0.082 g m-w s-1 over seven days and 0.0035-0.011 g m-w s-1 over a further 57 days during which no additional fluvial sediments were deposited.The reduction in sediment transport rate is attributed to both a depleted sediment supply and a decrease in above threshold winds. The supply of fine sediments to this proglacial region is dependent on meltwater suspended sediment loads which are predicted to increase during glacier retreat; reworking of the floodplain during ice retreat may also make more material available for aeolian transport.

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Products and Effects of Modern Eolian Activity on a Nineteenth-Century Glacier-Pushed Ridge in West Spitsbergen, Svalbard

Cited by 16 publications

References 0 publications

Observations of aeolian transport and niveo‐aeolian deposition at three lowland sites, Canadian arctic archipelago

Observations of aeolian transport and niveo‐aeolian deposition at three lowland sites, Canadian arctic archipelago

Structure of a Pleistocene push moraine revealed by GPR: the eastern Veluwe Ridge, The Netherlands

Dust generation on a proglacial floodplain, West Greenland

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