| DOI: | 10.1002/2015GL067542
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| 论文题名: | The hydrology of subglacial overdeepenings: A new supercooling threshold formula |
| 作者: | Werder M.A.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9296
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| EISSN: | 1944-9027
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| 出版年: | 2016
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| 卷: | 43, 期:5 | | 起始页码: | 2045
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| 结束页码: | 2052
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| 语种: | 英语
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| 英文关键词: | glacial erosion
; overdeepening
; subglacial hydrology
; supercooling
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| Scopus关键词: | Glacial geology
; Hydrology
; Drainage systems
; Formation mechanism
; Glacial erosion
; Glacial landforms
; Overburden pressures
; Overdeepening
; Subglacial hydrology
; Water pressures
; Supercooling
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| 英文摘要: | Overdeepenings are a hallmark glacial landform of broad geomorphologlogical and glaciological interest. Their formation mechanism has not yet been fully uncovered, but subglacial drainage is likely a key factor. One prominent hypothesis states that the depth of an overdeepening stabilizes at the supercooling threshold. This threshold is reached when the adverse bed slope terminating an overdeepening is sufficiently large to shut down the efficient, channelized drainage system. Classic theory puts this threshold at a ratio of bed to surface slope of-1.6. Here I extend that theory by taking into account that downstream water pressure can be below overburden pressure. The new formula agrees well with results from one- A nd two-dimensional subglacial drainage models. Applying it to observations of 147 overdeepenings from alpine glaciers and ice sheets shows that the depth of overdeepenings rarely exceeds the new supercooling threshold. Thus, this work supports the stabilizing hypothesis. © 2016. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84960402521&doi=10.1002%2f2015GL067542&partnerID=40&md5=c8bd445542a12abedac31fdd6bd906e2
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/10259
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Glaciology and Geomorphodynamics Group, Department of Geography, University of Zurich, Zurich, Switzerland
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| Recommended Citation: | |
Werder M.A.. The hydrology of subglacial overdeepenings: A new supercooling threshold formula[J]. Geophysical Research Letters,2016-01-01,43(5).
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