DOI: 10.1016/j.epsl.2018.03.022
Scopus记录号: 2-s2.0-85044069467
论文题名: The influence of basal-ice debris on patterns and rates of glacial erosion
作者: Ugelvig S.V. ; Egholm D.L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 490 起始页码: 110
结束页码: 121
语种: 英语
英文关键词: computational modeling
; glacial erosion
; landscape evolution
Scopus关键词: Abrasion
; Debris
; Erosion
; Glacial geology
; Computational experiment
; Computational model
; Dynamic feedback
; Erosion process
; Glacial erosion
; Landscape evolutions
; Late Cenozoic
; Physics-based models
; Ice
; abrasion
; basal ice
; erosion rate
; glacial debris
; glacial erosion
; glacier
; landscape evolution
; numerical model
英文摘要: Glaciers have played a key role for shaping much of Earth's high topography during the cold periods of the Late Cenozoic. However, despite of their distinct influence on landscapes, the mechanisms of glacial erosion, and the properties that determine their rate of operation, are still poorly understood. Theoretical models of subglacial erosion generally highlight the influence of basal sliding in setting the pace of erosion, but they also point to a strong influence of other subglacial properties, such as effective bed pressure and basal-ice debris concentration. The latter properties are, however, not easily measured in existing glaciers, and hence their influence cannot readily be confirmed by observations. In order to better connect theoretical models for erosion to measurable properties in glaciers, we used computational landscape evolution experiments to study the expected influence of basal-ice debris concentration for subglacial abrasion at the scale of glaciers. The computational experiments couple the two erosion processes of quarrying and abrasion, and furthermore integrate the flow of ice and transport of debris within the ice, thus allowing for the study of dynamic feedbacks between subglacial erosion and systematic glacier-scale variations in basal-ice debris concentration. The experiments explored several physics-based models for glacial erosion, in combination with different models for basal sliding to elucidate the relationship between sliding speed, erosion rate and basal-ice debris concentration. The results demonstrate how differences in debris concentration can explain large variations in measured rates. The experiments also provide a simple explanation for the observed dependence of glacier-averaged rate of erosion on glacier size: that large glacier uplands feed more debris into their lower-elevation parts, thereby strengthening their erosive power. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109940
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus C, 8000, Denmark
Recommended Citation:
Ugelvig S.V.,Egholm D.L.. The influence of basal-ice debris on patterns and rates of glacial erosion[J]. Earth and Planetary Science Letters,2018-01-01,490