气候变化领域集成服务门户(CCPortal): The origins of s-forms: Form similarity, process analogy, and links to high-energy, subglacial meltwater flows

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DOI	10.1016/j.earscirev.2019.102994
	The origins of s-forms: Form similarity, process analogy, and links to high-energy, subglacial meltwater flows
	Shaw J.; Gilbert R.G.; Sharpe D.R.; Lesemann J.-E.; Young R.R.
发表日期	2020
ISSN	00128252
卷号	200
英文摘要	This paper first presents the history of ideas on s-form formation, with an emphasis on meltwater models. The main approach is based on form similarity between modern erosional marks and subglacial s-forms. Form similarity is then extended to process similarity, which promotes understanding of s-forms. Three classes of erosional marks are identified: obstacle scours, basin-shaped erosional marks and landforms related to escarpment flow. Identification is based on form, with recognition of elements, though it mainly depends on recognition of the whole form in much the same way as we recognize family members or familiar flowers. Flow conditions related to the various flow features are determined by flow visualization and computational fluid dynamics. Some s-forms are produced in flume models, though most are natural features observed in the field. Examples from beneath past ice-sheets are seen in the field and illustrated by air and ground photographs, satellite images and DEM (digital elevation model). The results of this work show remarkable similarity between modern erosional marks and ancient, subglacial s-forms. Consequently established processes are attributed to ancient forms. In turn, s-forms may be used abductively to interpret subglacial, hydrological conditions. The lack of waning stage bedforms scoured into primary forms, suggests that erosional marks form under abruptly terminating, catastrophic flow. © 2019 Elsevier B.V.
关键词	Furrows Megaflood Meltwater sheet flow s-forms Subglacial Transverse troughs
英文关键词	computational fluid dynamics; flood; glacier; ice sheet; meltwater; sheet flow
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203881
作者单位	University of British Columbia, Department of Earth, Environmental, Kelowna, V1V 1V7, Canada
推荐引用方式 GB/T 7714	Shaw J.,Gilbert R.G.,Sharpe D.R.,et al. The origins of s-forms: Form similarity, process analogy, and links to high-energy, subglacial meltwater flows[J],2020,200.
APA	Shaw J.,Gilbert R.G.,Sharpe D.R.,Lesemann J.-E.,&Young R.R..(2020).The origins of s-forms: Form similarity, process analogy, and links to high-energy, subglacial meltwater flows.Earth Science Reviews,200.
MLA	Shaw J.,et al."The origins of s-forms: Form similarity, process analogy, and links to high-energy, subglacial meltwater flows".Earth Science Reviews 200(2020).