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DOI | 10.1029/2019GL082304 |
A Model for the Formation of Eskers | |
Hewitt, Ian J.1; Creyts, Timothy T.2 | |
2019-06-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:12页码:6673-6680 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA |
英文摘要 | We develop a mathematical model for esker formation by the continuous deposition of sediments near the mouth of water-filled subglacial tunnels. We assume a retreating ice sheet margin and prescribe meltwater and sediment supply to a channelized subglacial drainage system. The hydrodynamic model for the subglacial channel has its cross section governed by wall melting, creep closure, and sediment deposition. Sediment-carrying capacity typically increases downstream, before decreasing rapidly near the margin, suggesting that most deposition occurs there. This can lead to choking near the margin, which is offset by enhanced melting to keep the channel open. The model shows that the deposition rate varies roughly quadratically with sediment supply and inversely with water flux. For given sediment supply, the model suggests esker formation is most prevalent in smaller channels. Larger ice sheet melt rates likely produce more closely spaced eskers, but with smaller cross sections. |
英文关键词 | esker subglacial landforms mathematical model deglaciation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000477616300057 |
WOS关键词 | SUBGLACIAL DRAINAGE ; SEDIMENT TRANSPORT ; ICE ; LAURENTIDE ; EROSION ; DEGLACIATION ; BENEATH |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/184256 |
专题 | 气候变化 |
作者单位 | 1.Univ Oxford, Math Inst, Oxford, England; 2.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA |
推荐引用方式 GB/T 7714 | Hewitt, Ian J.,Creyts, Timothy T.. A Model for the Formation of Eskers[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(12):6673-6680. |
APA | Hewitt, Ian J.,&Creyts, Timothy T..(2019).A Model for the Formation of Eskers.GEOPHYSICAL RESEARCH LETTERS,46(12),6673-6680. |
MLA | Hewitt, Ian J.,et al."A Model for the Formation of Eskers".GEOPHYSICAL RESEARCH LETTERS 46.12(2019):6673-6680. |
条目包含的文件 | 条目无相关文件。 |
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