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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Dune formation under bimodal winds
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Dune formation under bimodal winds

机译：双峰风下的沙丘形成

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摘要

The study of dune morphology represents a valuable tool in the investigation of planetary wind systems-the primary factor controlling the dune shape is the wind directionality. However, our understanding of dune formation is still limited to the simplest situation of unidirectional winds: There is no model that solves the equations of sand transport under the most common situation of seasonally varying wind directions. Here we present the calculation of sand transport under bimodal winds using a dune model that is extended to account for more than one wind direction. Our calculations show that dunes align longitudinally to the resultant wind trend if the angle θ_w between the wind directions is larger than 90°. Under high sand availability, linear seif dunes are obtained, the intriguing meandering shape of which is found to be controlled by the dune height and by the time the wind lasts at each one of the two wind directions. Unusual dune shapes including the "wedge dunes" observed on Mars appear within a wide spectrum of bimodal dune morphologies under low sand availability.
机译：沙丘形态研究是研究行星风系统的重要工具-控制沙丘形状的主要因素是风向性。但是，我们对沙丘形成的理解仍然仅限于单向风的最简单情况：在季节性变化的风向最常见的情况下，没有模型能够解决沙运方程。在这里，我们介绍了使用沙丘模型对双峰风下的沙运量进行计算，该模型被扩展为考虑多个风向。我们的计算结果表明，如果风向之间的角度θ_w大于90°，​​则沙丘会与所得风向纵向对齐。在较高的沙土利用率下，可获得线性的seif沙丘，其有趣的曲折形状受沙丘高度和风在两个风向中的每个风向持续的时间所控制。在低含沙量下，在火星上观察到的不寻常的沙丘形状（包括“楔形沙丘”）会出现在多种双峰沙丘形态中。

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    Eric J. R. Parteli; Orencio Duran; Haim Tsoar; Veit Schwaemmle; Hans J. Herrmann;

  • 作者单位

    Departamento de Fisica, Universidade Federal do Ceara, Fortaleza, CE 60455-760, Brazil;

    Laboratoire de Physique et Mecanique des Milieux Heterogenes, Unite Mixte de Recherche, Centre National de Recherche Scientifique 7636, Ecole Superieure de Physique et de Chimie industrielles, 10 Rue Vauqueiin, 75231 Paris Cedex 05, France;

    Department of Geography and Environmental Development, Ben-Gurion University Negev, Beer Sheva 84105, Israel;

    Centro Brasileiro de Pesquisas Fisicas, Rua Xavier Sigaud 150, Rio de Janeiro, RJ 22290-180, Brazil;

    Departamento de Fisica, Universidade Federal do Ceara, Fortaleza, CE 60455-760, Brazil Computational Physics Research Group, Institute for Building Materials, Swiss Federal Institute of Technology, Schafmattstrasse 6, 8093 Zuerich, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    pattern formation; critical phenomena; aeolian transport; erosion and sedimentation;

    机译：模式形成;严重现象;风沙运输;侵蚀和沉淀;

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