Results 21 to 30 of about 12,531 (254)

Quantifying subglacial soft bed sedimentary processes

, 2022
<p>An understanding of subglacial processes are a vital component of ice-sheet models for sea level rise prediction as the use of different sliding laws can result in very different outcomes. In particular, the West Antarctic ice streams, are potentially unstable, and are underlain by soft (unconsolidated) beds, which have rarely been ...
Jane Hart, Kirk Martinez, Nathaniel Baurley, Benjamin Robson   +3 more
openaire   +3 more sources

Supraglacial Lake Drainage: from process puzzle to subglacial diagnostic

Supraglacial lake drainages are isolated events that deliver the largest observable fluxes of surface melt to the ice-sheet bed. This talk will present advances in the study of these lake drainages, through which we piece together an empirical understanding of glacier hydrology.
Stevens, LA, Banwell, AF, Behn, MD, Chase, DL, Das, SB, Dell, RL, Falconer, E, Joughin, IR, Lai, C-Y, Larochelle, S, Lu, GJ, McGuire, JJ, Nettles, M, Okal, M, Rines, J, Willis, IC   +15 more
openaire   +2 more sources

The Effect of Subglacial Chemical Processes on Glacier Sliding [PDF]

Journal of Glaciology, 1976
Abstract The glacier sliding theory of Nye is modified to include the effect of solutes in subglacial regelation waters on the sliding process. Motivation for this development stems from studies of subglacially formed chemical deposits that appear to be widespread on rock surfaces recently exposed by retreating temperate glaciers.
B. Hallet
openaire   +2 more sources

The Devil Lake pothole (Ontario): Evidence of subglacial fluvial processes [PDF]

Géographie physique et Quaternaire, 2002
A pothole 1.93 m deep and 1.3 m maximum diameter is located near the crest of a ridge that forms one arm of an eroded anticline in para-gneiss of the Precambrian Shield in southeastern Ontario. It's position on high ground in a region of more than 100 m relief on the bed rock precludes its formation by modern subaerial stream flow or by streams that ...
Robert G. Gilbert
openaire   +3 more sources

Different geomorphic processes control suspended sediment and bedload export from glaciers [PDF]

Nature Communications
Ongoing cryospheric change has modified sediment export from glacierized catchments substantially, with significant implications for ecosystems and downstream users, notably hydropower companies.
Ian Delaney, Frédéric Lardet, Matt Jenkin, Davide Mancini, Stuart N. Lane   +4 more
doaj   +2 more sources

Subglacial Processes and Subglacial Hydrology

, 2016
The hydrology of glaciers is known to have a significant influence on glacier dynamics. Rapid variations in dynamics can occur due to changes in the glacial and subglacial hydrology. However, our understanding of the subglacial drainage system is based on few direct and usually short-term observations.
Pierre-Marie Lefeuvre
openaire   +2 more sources

Computationally efficient subglacial drainage modelling using Gaussian process emulators: GlaDS-GP v1.0 [PDF]

Geoscientific Model Development
Abstract. Subglacial drainage models represent water flow at the ice–bed interface through coupled distributed and channelized systems to determine water pressure, discharge, and drainage system geometry. While they are used to understand processes such as the relationship between surface melt and ice flow, the number of uncertain model parameters and ...
Tim Hill, Derek Bingham, Gwenn Flowers, Matthew J. Hoffman   +3 more
  +4 more sources

Differential impact of isolated topographic bumps on ice sheet flow and subglacial processes [PDF]

The Cryosphere, 2023
Topographic highs (“bumps”) across glaciated landscapes have the potential to temporarily slow ice sheet flow or, conversely, accelerate ice flow through subglacial strain heating and meltwater production.
M. A. McKenzie, L. E. Miller, J. S. Slawson, J. S. Slawson, E. J. MacKie, S. Wang   +5 more
doaj   +1 more source

Physical processes in Subglacial Lake Whillans, West Antarctica: Inferences from sediment cores

Earth and Planetary Science Letters, 2016
Timothy Hodson, Ross D. Powell, Stefanie Brachfeld, Sławek Tulaczyk, Reed P. Scherer   +4 more
openalex   +4 more sources

Subglacial drainage modelling and Bayesian calibration using Gaussian Process emulators

Subglacial drainage models sensitively depend on the values of numerous uncertain parameters. However, the computation time associated with running these models makes it difficult to quantify the associated uncertainty in model outputs and to use field data to calibrate parameter values.
Tim Hill, Gwenn Flowers, Derek Bingham, Matthew Hoffman   +3 more
openaire   +2 more sources