Recent High-Arctic glacial sediment redistribution: A process perspective using airborne lidar

Irvine‐Fynn, Tristram; Barrand, Nicholas E.; Porter, Philip R.; Hodson, Andy; Murray, Tavi

doi:10.1016/j.geomorph.2010.08.012

Cited by 55 publications

(56 citation statements)

References 89 publications

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“…As the parts of the glacier forefield are likely to be geomorphologically unstable (e.g. -Fynn et al, 2011), where possible control points were located outside the Neoglacial moraine. The 2014 imagery was georeferenced using 27 ground control-points consisting of A3 sized paper targets placed on snow-free areas of the moraine (Fig.…”

Section: Data Acquisitionmentioning

confidence: 99%

“…However, the high-Arctic glacial environment in Svalbard is known for its highly unstable ice-cored moraine, and rapidly progressing mass wasting processes (Bennett et al, 2000;Schomacker, 2008;Irvine-Fynn et al, 2011;Ewertowski and Tomczyk, 2015). Schomacker (2008) …”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Whilst the dynamics of de-icing have been studied (e.g. Schomacker 2008;Irvine-Fynn et al, 2011;Bennett and Evans, 2012), the resulting preservation potential of these landforms in the geomorphological record is unclear (Bennett et al, 2000;Evans, 2009). …”

Section: Introductionmentioning

confidence: 99%

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Ice-cored moraine degradation mapped and quantified using an unmanned aerial vehicle: A case study from a polythermal glacier in Svalbard

et al. 2016

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Section: Data Acquisitionmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Ice-cored moraine degradation mapped and quantified using an unmanned aerial vehicle: A case study from a polythermal glacier in Svalbard

et al. 2016

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“…Controls on buried ice ablation were reviewed in Schomacker (2008). Subsequent to the publication of this review, a wider range of studies have provided insight into the processes of buried ice ablation and paraglacial redistribution of sediments following deglaciation (e.g., Irvine-Fynn et al, 2011;Ewertowski, 2014;Ewertowski and Tomczyk, 2015;.…”

Section: Introductionmentioning

confidence: 99%

Evolution of high-Arctic glacial landforms during deglaciation

et al. 2018

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Glacial landsystems in the high-Arctic have been reported to undergo geomorphological transformation during deglaciation. This research evaluates moraine evolution over a decadal timescale at Midtre Lovénbreen, Svalbard. This work is of interest because glacial landforms developed in Svalbard have been used as an analogue for landforms developed during Pleistocene mid-latitude glaciation. Ground penetrating radar was used to investigate the subsurface characteristics of moraines. To determine surface change, a LiDAR topographic data set (obtained 2003) and a UAV-derived (obtained 2014) digital surface model processed using structure-from-motion (SfM) are also compared. Evaluation of these data sets together enables subsurface character and landform response to climatic amelioration to be linked. Ground penetrating radar evidence shows that the moraine substrate at Midtre Lovénbreen includes ice-rich (radar velocities of 0.17 m ns (mean thresholded rate of −4.39 m over the 11-year observation period). However, the debris-rich zones show a relatively low rate of surface change (mean thresholded rate of −0.98 m over the 11-year observation period), and the morphology of the debris-rich landforms appear stable over the observation period. A complex response of proglacial landforms to climatic warming is shown to occur within and between glacier forelands as indicated by spatially variable surface lowering rates. Landform response is controlled by the ice-debris balance of the moraine substrate, along with the topographic context (such as the influence of meltwater). Site-specific characteristics such as surface debris thickness and glaciofluvial drainage are, therefore, argued to be a highly important control on surface evolution in ice-cored terrain, resulting in a diverse response of high-Arctic glacial landsystems to climatic amelioration. These results highlight that care is needed when assessing the long-term preservation potential of contemporary landforms at high-Arctic glaciers. A better understanding of ice-cored terrain facilitates the development of appropriate age and climatic interpretations that can be obtained from palaeo ice-marginal landsystems.

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“…Quantification of the annual changes, e.g. using LiDAR (Irvine-Fynn et al, 2011), or implementation of terrestrial laser scanning (TLS) for geomorphological modelling ) is much less common.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the ice-cored moraines' short-term dynamics in the high-Arctic glaciers Ebbabreen and Ragnarbreen, Petuniabukta, Svalbard

Ewertowski

Tomczyk

2015

Geomorphology

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Extensive ice-cored moraine complexes are common elements, marking the last advance of many Svalbard glaciers. Sediment gravity flows are among the most dynamic processes, transforming these landforms. The short-term (yearly and weekly) dynamics of mass-wasting processes were studied in a cm-scale using repetitive topographic scanning. We monitored several active sites on the forelands of two glaciers, Ebbabreen and Ragnarbreen, both of which are located near the Petuniabukta at the northern end of Billefjorden in Spitsbergen.The surveys indicate high dynamic rates of landforms' transformation. The mean annual volume loss of sediments and dead-ice for the most active parts of the moraines was up to 1.8 m a -1 . However, most of the transformation occurred during summer, with the short-term values of mean elevation changes as high as −104 mm day −1 . In comparison, the dynamics of the other (i.e. non-active) parts of the ice-cored moraines were much lower, namely, the mean annual lowering (attributed mainly to dead-ice downwasting) was up to 0.3 m a -1 , whereas lowering during summer was up to 8 mm day −1 . Our results indicate that in the case of the studied glaciers, backwasting was much more effective than downwasting in terms of landscape transformation in the glacier forelands. However, despite the high activity of localised mass movement processes, the overall short-term dynamics of ice-cored moraines for the studied glaciers were relatively low. We suggest that as long as debris cover is sufficiently thick (thicker than the permafrost's active layer depths), the mass movement activity would occur only under specific topographic conditions and/or due to occurrence of external meltwater sources and slope undercutting. In other areas, ice-cored moraines remain a stable landsystem component in a yearly to decadal time-scale. Graphical abstractPlease cite this article as: Ewertowski, Marek W., Tomczyk, Aleksandra M., Quantification of the ice-cored moraines' short-term dynamics in the high-Arctic glaciers Ebbabreen and Ragnarbreen, Petuniabukta, Svalbard, Geomorphology 234 (2015): 211-227,

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Recent High-Arctic glacial sediment redistribution: A process perspective using airborne lidar

Cited by 55 publications

References 89 publications

Ice-cored moraine degradation mapped and quantified using an unmanned aerial vehicle: A case study from a polythermal glacier in Svalbard

Ice-cored moraine degradation mapped and quantified using an unmanned aerial vehicle: A case study from a polythermal glacier in Svalbard

Evolution of high-Arctic glacial landforms during deglaciation

Quantification of the ice-cored moraines' short-term dynamics in the high-Arctic glaciers Ebbabreen and Ragnarbreen, Petuniabukta, Svalbard

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