Profile measurement and simulation of a transverse dune field in the Lencois Maranhenses
Profile measurement and simulation of a transverse dune field in the Lencois Maranhenses
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DOI：
10.1016/j.geomorph.2006.02.015
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发表时间：
2006-11-20
期刊：
影响因子：
3.9
通讯作者：
Maia, L. P.
中科院分区：
文献类型：
--
作者：
Parteli, E. J. R.;Schwaemmle, V.;Maia, L. P.
在这项工作中，我们报告了对巴西东北部沿海沙丘区“Lengcois Maranhens”的横向沙丘高度剖面的测量。我们的测量表明，与Barchan沙丘的情况相反，高度大致相同的横向沙丘相对于峰顶呈现出不同的边缘位置。在野外资料的基础上，给出了沙丘间距与横向沙丘峰缘距离的关系。此外，我们将测量结果与从二维沙丘模型得到的横向沙丘的模拟结果进行了比较，在该模型中，引入了近距离横向沙丘背风面分离流线长度的唯象定义。我们发现，我们的模型再现了具有相似沙丘间距和沙丘纵横比的横向沙丘区域。(C)2006爱思唯尔B.V.保留所有权利。
In this work, we report measurements of the height profile of transverse dunes in the coastal dune field known as "Lengcois Maranhenses", northeastern Brazil. Our measurements show that transverse dunes with approximately the same height present a variable brink position relative to the crest, in contrast to the case of barchan dunes. Based on our field data, we present a relation for the dune spacing as a function of the crest-brink distances of transverse dunes. Furthermore, we compare the measurements with simulations of transverse dunes obtained from a two-dimensional dune model, where a phenomenological definition is introduced for the length of the separation streamlines on the lee side of closely spaced transverse dunes. We find that our model reproduces transverse dune fields with similar interdune distances and dune aspect ratios as measured in the field. (c) 2006 Elsevier B.V. All rights reserved.