气候变化领域集成服务门户(CCPortal): A unified model of ripples and dunes in water and planetary environments

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DOI	10.1038/s41561-019-0336-4
	A unified model of ripples and dunes in water and planetary environments
	Duran Vinent O.; Andreotti B.; Claudin P.; Winter C.
发表日期	2019
ISSN	17520894
卷号	12 期号:5
英文摘要	Subaqueous and aeolian bedforms are ubiquitous on Earth and other planetary environments. However, it is still unclear which hydrodynamic mechanisms lead to the observed variety of morphologies of self-organized natural patterns such as ripples, dunes or compound bedforms. Here we present simulations with a coupled hydrodynamic and sediment transport model that resolve the initial and mature stages of subaqueous and aeolian bedform evolution in the limit of large flow thickness. We identify two types of bedforms consistent with subaqueous ripples and dunes, and separated by a gap in wavelength. This gap is explained in terms of an anomalous hydrodynamic response in the structure of the inner boundary layer that leads to a shift of the position of the maximum shear stress from upstream to downstream of the crest. This anomaly gradually disappears when the bed becomes hydrodynamically rough. By also considering the effect of the spatial relaxation of sediment transport we provide a new unifying framework to compare ripples and dunes in planetary environments to their terrestrial counterparts. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	bedform; boundary layer; eolian deposit; hydrodynamics; ripple; sediment transport; shear stress
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124678
作者单位	MARUM Center for Marine Environmental Sciences, Bremen University, Bremen, Germany; Department of Ocean Engineering, Texas A&M University, College Station, TX, United States; Laboratoire de Physique et Mécanique des Milieux Hétérogènes, PMMH UMR 7636 CNRS — ESPCI PSL Research University — Univ. Paris-Diderot — Sorbonne Université, Paris, France; Institute of Geosciences, Christian-Albrechts University Kiel, Kiel, Germany; Laboratoire de Physique de l’Ecole Normale Supérieure (LPENS), UMR 8023 ENS-CNRS, University Paris-Diderot, Paris, France
推荐引用方式 GB/T 7714	Duran Vinent O.,Andreotti B.,Claudin P.,et al. A unified model of ripples and dunes in water and planetary environments[J],2019,12(5).
APA	Duran Vinent O.,Andreotti B.,Claudin P.,&Winter C..(2019).A unified model of ripples and dunes in water and planetary environments.Nature Geoscience,12(5).
MLA	Duran Vinent O.,et al."A unified model of ripples and dunes in water and planetary environments".Nature Geoscience 12.5(2019).