DOI: 10.1038/ngeo2047
论文题名: Emergence of oblique dunes in a landscape-scale experiment
作者: Ping L. ; Narteau C. ; Dong Z. ; Zhang Z. ; Courrech Du Pont S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 2 起始页码: 99
结束页码: 103
语种: 英语
Scopus关键词: arid region
; bedform
; cohesion
; dune
; dune formation
; eolian deposit
; experimental study
; landscape evolution
; timescale
; wind forcing
; wind profile
; China
; Nei Monggol
; Tengger Desert
英文摘要: Aeolian dunes in many arid environments on Earth are shaped by seasonally varying bimodal wind regimes. However, the dynamics of dune evolution under such wind regimes are difficult to investigate at the time and length scales of laboratory experiments. These bedforms, in their natural environments, may also be influenced by unknown initial conditions and a variety of factors such as sediment availability, vegetation and cohesion. Here we report results from a landscape-scale experiment in which we examine the evolution of bedforms under asymmetric bimodal winds. After flattening an experimental dunefield across 16 hectares of the Tengger Desert in Inner Mongolia, we measured winds and topography from March 2008 to October 2011 to reveal the development of regular dune patterns with a constant wavelength and increasing amplitude. On a seasonal timescale, we show that individual dunes propagate in different directions according to the prevailing wind. We find that the orientation of dune crests is controlled by the combination of the normal contributions of the two dominant winds, with respect to their relative strengths and directions, such that crests form an oblique angle of 50with the resultant sand flux. Our landscape-scale experiment suggests that the alignment of aeolian dunes can be used to determine wind forcing patterns on the Earth and other planetary bodies. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106463
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, 320 West Donggang Road, Lanzhou 730000, Gansu, China; Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Univ Paris Diderot, 1 rue Jussieu, Paris 75238, Cedex 05, France; Laboratoire Matière et Système Complexes, Sorbonne Paris Cité, Univ Paris Diderot, 10 rue Alice Domon et Léonie Duquet, Paris 75205, Cedex 13, France
Recommended Citation:
Ping L.,Narteau C.,Dong Z.,et al. Emergence of oblique dunes in a landscape-scale experiment[J]. Nature Geoscience,2014-01-01,7(2)