Barchan dune corridors: Field characterization and investigation of control parameters
Barchan dune corridors: Field characterization and investigation of control parameters
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DOI：
10.1029/2007jf000767
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发表时间：
2008-03-08
影响因子：
3.9
通讯作者：
Claudin, P.
中科院分区：
文献类型：
--
作者：
Elbelrhiti, H.;Andreotti, B.;Claudin, P.
对位于Tarfaya和欧云（大西洋撒哈拉，摩洛哥）之间的新月形油气田的结构进行了定量研究，并与拉潘帕德拉霍亚（阿雷基帕，秘鲁）的构造进行了比较。实地测量的基础上，我们展示了如何的体积，速度，和输出沙通量的沙丘可以计算从它的身体和喇叭宽度的值。沙丘的大小分布是从航空照片的分析。结果表明，这些场沿风向呈统计上的沿着均匀状态，在横向上呈“走廊”结构，沙丘的大小有较好的选择。调查可能的外部参数控制这些走廊，我们表明，地形，粒度，风和沙通量之间没有相关的。最后，我们讨论了在这些领域的工作动力学过程（碰撞和风的波动），并调查他们可以调节沙丘的大小的方式。此外，我们表明，沙丘场输送的总沙通量小于在没有沙丘的情况下可能达到的最大输送量，即，在坚实的地面上跳跃。
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 that the overall sand flux transported by a dune field is smaller than the maximum transport that could be reached in the absence of dunes, i.e., in saltation over the solid ground.