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Barchan dune corridors: field characterization and investigation of control parameters

Elbelrhiti, Hicham ; Andreotti, Bruno ; Claudin, Philippe; Claudin, Philippe (pacrepositoryorg)

arXiv.org, Jul 10, 2007 [Tạp chí có phản biện]

E-ISSN: 2331-8422 ; DOI: 10.1029/2007JF000767

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  • Nhan đề:
    Barchan dune corridors: field characterization and investigation of control parameters
  • Tác giả: Elbelrhiti, Hicham ; Andreotti, Bruno ; Claudin, Philippe
  • Claudin, Philippe (pacrepositoryorg)
  • Chủ đề: Investigations ; Aerial Photography ; Wind Direction ; Size Distribution ; Transportation Corridors ; Flux ; Sand ; Parameters ; Photographs ; Dunes ; Wind Variations
  • Là 1 phần của: arXiv.org, Jul 10, 2007
  • Mô tả: The structure of the barchan field located between Tarfaya and Laayoune (Atlantic Sahara, Morocco) is quantitatively investigated and compared to that in La Pampa de la Joya (Arequipa, Peru). On the basis of field measurements, we show how the volume, the velocity and the output sand flux of a dune can be computed from the value of its body and horn widths. The dune size distribution is obtained from the analysis of aerial photographs. It shows that these fields are in a statistically homogeneous state along the wind direction and present a `corridor' structure in the transverse direction, in which the dunes have a rather well selected size. Investigating the possible external parameters controlling these corridors, we demonstrate that none among topography, granulometry, wind and sand flux is relevant. We finally discuss the dynamical processes at work in these fields (collisions and wind fluctuations), and investigate the way they could regulate the size of the dunes. Furthermore we show...
  • Ngôn ngữ: English
  • Số nhận dạng: E-ISSN: 2331-8422 ; DOI: 10.1029/2007JF000767

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