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A numerical study on the influence of geometry on the formation of sandbanks

机译:几何形状对沙洲形成影响的数值研究

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摘要

Applying a two-dimensional, non-linear hydrodynamic numerical model in combination with a semiempirical equation for bedload sediment transport, the influence of geometry on the formation of sandbanks is investigated. In the first experiment, the formation of sandbanks in an ideal rectangular basin, resembling the Taylor's problem, was calculated. Sandbanks occur in a small area at the closed boundary. Similar experiments were carried out for a range of wavelengths of the incident Kelvin wave. The results reveal that large wavelengths favor the generation of sandbanks. In subsequent calculations, the basin was modified by introducing new geographical features like bays and peninsulas. The numerical experiments show that geometry is a fundamental factor to determine the position where groups of sandbanks appear. The results suggest that in regions where the Kelvin wave is diffracted, the formation of sandbanks occurs. An experiment, in which we applied an ideal geometric configuration representing that of the Southern Bight of the North Sea, generated sandbank patterns resembling those observed in the region.
机译:应用二维非线性水动力数值模型,结合半经验方程,进行了床底泥沙的输运,研究了几何形状对沙洲形成的影响。在第一个实验中,计算了一个理想的矩形盆地中类似于泰勒问题的沙洲形成。沙洲发生在封闭边界的一小块区域。对入射开尔文波的一系列波长进行了类似的实验。结果表明,大波长有利于沙丘的产生。在随后的计算中,通过引入新的地理特征(如海湾和半岛)对盆地进行了修改。数值实验表明,几何形状是确定沙洲群出现位置的基本因素。结果表明,在开尔文波发生衍射的区域,形成了沙堤。我们进行了一项实验,在该实验中,我们应用了代表北海南部海岸线的理想几何构型,生成了与该地区类似的沙丘花纹。

著录项

  • 来源
    《Ocean Dynamics》 |2005年第6期|559-568|共10页
  • 作者单位

    Instituto Potosino de Investigation Cientifica y Tecnologica, Apdo Postal 3-74, Tangamanga, 78231 San Luis Potosi S L P, Mexico;

    rnDeparlement de Genie Energetique et Environnemenl Domaine Scientifique de la Doua, Institut National des sciences Appliquees, Batiment Sadi Carnot 9, rue de la Physique, 69 100 Villeurbanne, France;

    rnInstituto Potosino de Investigation Cientifica y Tecnologica, Apdo Postal 3-74, Tangamanga, 78231 San Luis Potosi S L P, Mexico;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    numerical modeling; tides; sandbanks; taylor's problem;

    机译:数值建模;潮汐沙洲泰勒的问题;

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