干旱区生态环境知识资源中心(Arid): Direct validation of dune instability theory

Arid

DOI	10.1073/pnas.2024105118
	Direct validation of dune instability theory
	Lu, Ping; Narteau, Clement; Dong, Zhibao; Claudin, Philippe; Rodriguezb, Sebastien; An, Zhishan; Fernandez-Cascales, Laura; Gadal, Cyril; du Pont, Sylvain Courrech
通讯作者	Lu, P ; Narteau, C (corresponding author), Shaanxi Normal Univ, Schl Geog & Tourism, Xian 710119, Shaanxi, Peoples R China. ; Lu, P ; Narteau, C (corresponding author), Univ Paris, Inst Phys Globe Paris, CNRS, F-75005 Paris, France.
来源期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN	0027-8424
出版年	2021
卷号	118 期号:17
英文摘要	Modern dune fields are valuable sources of information for the large-scale analysis of terrestrial and planetary environments and atmospheres, but their study relies on understanding the small-scale dynamics that constantly generate new dunes and reshape older ones. Here, we designed a landscape-scale experiment at the edge of the Gobi desert, China, to quantify the development of incipient dunes under the natural action of winds. High-resolution topographic data documenting 42 mo of bedform dynamics are examined to provide a spectral analysis of dune pattern formation. We identified two successive phases in the process of dune growth, from the initial flat sand bed to a meter-high periodic pattern. We focus on the initial phase, when the linear regime of dune instability applies, and measure the growth rate of dunes of different wavelengths. We identify the existence of a maximum growth rate, which readily explains the mechanism by which dunes select their size, leading to the prevalence of a 15-m wavelength pattern. We quantitatively compare our experimental results with the prediction of the dune instability theory using transport and flow parameters independently measured in the field. The remarkable agreement between theory and observations demonstrates that the linear regime of dune growth is permanently expressed on low-amplitude bed topography, before larger regular patterns and slip faces eventually emerge. Our experiment underpins existing theoretical models for the early development of eolian dunes, which can now be used to provide reliable insights into atmospheric and surface processes on Earth and other planetary bodies.
英文关键词	dune instability size selection sediment transport surface winds
类型	Article
语种	英语
开放获取类型	Green Submitted, Green Published, Bronze
收录类别	SCI-E
WOS记录号	WOS:000672579000001
WOS关键词	RIPPLE FORMATION ; FIELD EVIDENCE ; SAND ; BEDFORMS ; WIND ; ORIENTATION ; MECHANISMS ; TRANSVERSE ; STABILITY ; SURFACE
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364416
作者单位	[Lu, Ping; Narteau, Clement; Dong, Zhibao] Shaanxi Normal Univ, Schl Geog & Tourism, Xian 710119, Shaanxi, Peoples R China; [Lu, Ping; Narteau, Clement; Rodriguezb, Sebastien; Fernandez-Cascales, Laura; Gadal, Cyril] Univ Paris, Inst Phys Globe Paris, CNRS, F-75005 Paris, France; [Claudin, Philippe] Univ Paris, Sorbonne Univ,CNRS, Paris Sci & Lettres Res Univ,Phys & Mecaniq Milie, Ecole Superieure Phys & Chim Ind Ville Paris, F-75005 Paris, France; [An, Zhishan] Northwest Inst Ecoenvironm & Res, Lanzhou 730000, Gansu, Peoples R China; [du Pont, Sylvain Courrech] Univ Paris, CNRS, Lab Matiere & Syst Complexes, F-75205 Paris 13, France
推荐引用方式 GB/T 7714	Lu, Ping,Narteau, Clement,Dong, Zhibao,et al. Direct validation of dune instability theory[J],2021,118(17).
APA	Lu, Ping.,Narteau, Clement.,Dong, Zhibao.,Claudin, Philippe.,Rodriguezb, Sebastien.,...&du Pont, Sylvain Courrech.(2021).Direct validation of dune instability theory.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,118(17).
MLA	Lu, Ping,et al."Direct validation of dune instability theory".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 118.17(2021).