Debris transport in a temperate valley glacier: Haut Glacier d’Arolla, Valais, Switzerland

Goodsell, Becky; Hambrey, Michael J.; Glasser, Neil F.

doi:10.3189/172756505781829647

Cited by 53 publications

(65 citation statements)

References 35 publications

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“…Longitudinal features, visible on the surface of the glacier at the southern side (Figure 5(a) and 5(c)), resemble longitudinal foliation reported from many glaciers worldwide (e.g. Goodsell, Hambrey, & Glasser, 2005;Hambrey, 1975;Hambrey et al, 2005;Jennings, Hambrey, Glasser, James, & Hubbard, 2015). These structures can be traced downflow into an ice-cored moraine complex, where they are still detectable as linear structures (Figure 5(b)) on the surface of the moraine.…”

Section: Glacier Surfacementioning

confidence: 80%

Glacial geomorphology of the terrestrial margins of the tidewater glacier, Nordenskiöldbreen, Svalbard

2016

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A 1:4000 scale map of the terrestrial margins of the foreland of Nordenskiöldbreen depicts a polythermal glacial landsystem containing a record of the landform signatures of individual ice flow units that operate within the glacier snout. A 1:700 map provides a detailed overview of fluted terrain, based on unmanned aerial vehicle images captured in 2014. The pattern of landforms lying inside the Little Ice Age (LIA) latero-frontal moraine on the northern side of the fjord comprises a fluted till surface, which in turn grades into icemoulded bedrock. This signature records the recession of a single, wide ice flow unit, which was characterised by limited incorporation of subglacial material and restricted delivery of supraglacial debris. Inside the latero-frontal moraine on the south side of the fjord, a fluted surface is subordinate to a pronounced and large ice-cored moraine complex related to the confluence of five narrower ice flow units, each of which transported significant quantities of englacial and supraglacial debris at their suture zones as a series of longitudinal debris stripes. The suite of foreland landforms is diagnostic of both temperate subglacial and frozen-snout conditions, indicating the operation of a warm polythermal glacier fed by multiple flow units during the LIA. ARTICLE HISTORY

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Section: Glacier Surfacementioning

confidence: 80%

Glacial geomorphology of the terrestrial margins of the tidewater glacier, Nordenskiöldbreen, Svalbard

2016

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“…The debris transport and deformation modelled here reproduces structures analogous to those observed in structural glaciology, where elongated and sometimes cross-cutting debris layers outcrop with a range of dip angles at the glacier surface (Jennings et al, 2014;Goodsell et al, 2005). Not only can these structures be reproduced, but the 2-D glacier simulations indicate that these elongated, band-shaped debris layers can form from initially fundamentally different debris deposits.…”

Section: Model Capabilities and Applicabilitymentioning

confidence: 56%

“…Hence, the initial shape of the deposit will be changed significantly, and this englacial deformation will affect the pattern of debris emergence at the glacier surface (e.g. Goodsell et al, 2005). In order to numerically model transport and deformation of sediment inclusions, a full representation of 3-D velocity fields resolving all spatial gradients is essential, which calls for a full-Stokes ice flow modelling approach.…”

Section: Introductionmentioning

confidence: 99%

Modelling debris transport within glaciers by advection in a full-Stokes ice flow model

Wirbel¹,

Jarosch²,

Nicholson³

2018

The Cryosphere

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Abstract. Glaciers with extensive surface debris cover respond differently to climate forcing than those without supraglacial debris. In order to include debris-covered glaciers in projections of glaciogenic runoff and sea level rise and to understand the paleoclimate proxy recorded by such glaciers, it is necessary to understand the manner and timescales over which a supraglacial debris cover develops. Because debris is delivered to the glacier by processes that are heterogeneous in space and time, and these debris inclusions are altered during englacial transport through the glacier system, correctly determining where, when and how much debris is delivered to the glacier surface requires knowledge of englacial transport pathways and deformation. To achieve this, we present a model of englacial debris transport in which we couple an advection scheme to a full-Stokes ice flow model. The model performs well in numerical benchmark tests, and we present both 2-D and 3-D glacier test cases that, for a set of prescribed debris inputs, reproduce the englacial features, deformation thereof and patterns of surface emergence predicted by theory and observations of structural glaciology. In a future step, coupling this model to (i) a debris-aware surface mass balance scheme and (ii) a supraglacial debris transport scheme will enable the co-evolution of debris cover and glacier geometry to be modelled.

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“…Entrainment of large volumes of subglacial or basal glacial debris accompanies this process Hambrey et al, 1999;Bennett, 2001;Glasser and Hambrey, 2001). Ice-marginal thrusting involving substantial volumes of debris has also been documented in temperate Icelandic glaciers, and locally in alpine temperate glaciers (Goodsell et al, 2005). Release of the debris produces moraine-mound complexes that maintain their integrity in zones of permafrost, albeit modified by slope processes (Hambrey and Huddart, 1995;Huddart and Hambrey, 1996;Bennett et al, 1999).…”

Section: Englacial Thrustingmentioning

confidence: 99%

Sediments and Landforms in an Upland Glaciated‐Valley Landsystem: Upper Ennerdale, English Lake District

Graham

Hambrey

2007

Glacial Sedimentary Processes and Products

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• This is a book chapter. ABSTRACTThe genesis of moraines associated with British glaciers of Younger Dryas age has proved controversial in recent years. A number of alternative hypotheses exist and, whilst it is generally accepted that such features are polygenetic in origin, some workers have argued that not all of the proposed mechanisms are valid. This paper seeks to explore these issues, using a case study from the English Lake District. A landsystems approach is adopted, integrating information at a variety of spatial scales to explain the development of the sediment-landform associations in upper Ennerdale.The evidence suggests that landform development resulted from a combination of icemarginal deposition and englacial thrusting. It is probable that thrusting resulted from flow compression against a reverse bedrock slope, combined with the confluence of ice from two separate source areas. It is argued that, whilst englacial thrust moraines may not be commonly associated with British Younger Dryas glaciers, under certain conditions englacial thrusting is an important process in landform development.

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Debris transport in a temperate valley glacier: Haut Glacier d’Arolla, Valais, Switzerland

Cited by 53 publications

References 35 publications

Glacial geomorphology of the terrestrial margins of the tidewater glacier, Nordenskiöldbreen, Svalbard

Glacial geomorphology of the terrestrial margins of the tidewater glacier, Nordenskiöldbreen, Svalbard

Modelling debris transport within glaciers by advection in a full-Stokes ice flow model

Sediments and Landforms in an Upland Glaciated‐Valley Landsystem: Upper Ennerdale, English Lake District

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