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DOI10.1029/2020GL088919
Spatial and Temporal Development of Incipient Dunes
Gadal C.; Narteau C.; Ewing R.C.; Gunn A.; Jerolmack D.; Andreotti B.; Claudin P.
发表日期2020
ISSN 0094-8276
卷号47期号:16
英文摘要In zones of loose sand, wind-blown sand dunes emerge due the linear instability of a flat sedimentary bed. This instability has been studied in experiments and numerical models but rarely in the field, due to the large time and length scales involved. We examine dune formation at the upwind margin of the White Sands Dune Field in New Mexico (USA), using 4 years of lidar topographic data to follow the spatial and temporal development of incipient dunes. Data quantify dune wavelength, growth rate, and propagation velocity and also the characteristic length scale associated with the growth process. We show that all these measurements are in quantitative agreement with predictions from linear stability analysis. This validation makes it possible to use the theory to reliably interpret dune-pattern characteristics and provide quantitative constraints on associated wind regimes and sediment properties, where direct local measurements are not available or feasible. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词Earth sciences; Geophysics; Characteristic length; Linear instabilities; Local measurement; Pattern characteristic; Propagation velocities; Quantitative agreement; Sediment properties; Temporal development; Linear stability analysis; digital mapping; dune formation; instability; lidar; satellite altimetry; sediment analysis; temporal variation; topographic mapping; New Mexico; United States; White Sands
语种英语
来源期刊Geophysical Research Letters
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/169872
作者单位Institut de Physique du Globe de Paris, Université de Paris, CNRS, Paris, France; Department of Geology and Geophysics, Texas A&M University, College Station, TX, United States; Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA, United States; Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA, United States; Laboratoire de Physique, ENS-PSL Research University, Université de Paris, CNRS, Sorbonne Université, Paris, France; Physique et Mécanique des Milieux Hétérogènes, ESPCI Paris-PSL Research University, Université de Paris, CNRS, Sorbonne Université, Paris, France
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Gadal C.,Narteau C.,Ewing R.C.,et al. Spatial and Temporal Development of Incipient Dunes[J],2020,47(16).
APA Gadal C..,Narteau C..,Ewing R.C..,Gunn A..,Jerolmack D..,...&Claudin P..(2020).Spatial and Temporal Development of Incipient Dunes.Geophysical Research Letters,47(16).
MLA Gadal C.,et al."Spatial and Temporal Development of Incipient Dunes".Geophysical Research Letters 47.16(2020).
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