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DOI | 10.1029/2020GL088919 |
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 |
推荐引用方式 GB/T 7714 | 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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