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Hydrodynamic and sediment dynamic modifications of tidal flow in the near-field area of offshore breakwaters

机译：海上防波堤近场区域潮流的水动力和泥沙动力变化

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摘要

Numerical modeling was used in order to study the effect of tidal currents within a breakwater scheme that has reached morphodynamic equilibrium. Tidal flow is simulated, using a downscaling procedure from a regional numerical model, in order to investigate the small-scale hydrodynamic modifications caused by the structures in the absence of waves. Sediment transport processes at different stages of the neap and spring tidal cycle are also considered over the entire scheme. Significant modifications to the tidal currents were identified, caused by the presence of the following structures: (1) obstruction of the main tidal flow and (2) flow channelization between the structures and the coastline, leading to flow acceleration over the salients. Furthermore, the effect of the modified tidal regime on bedload sediment transport processes was investigated. The design characteristics of the scheme (i.e., gap width, offshore distance, and relative angle with respect to the tidal currents) are found to influence locally the tidal flow and the bedload transport, over the top of the salients, modulating their growth. Despite being located in a mixed-energy, wave-dominated environment, the shear stress ratio between currents and waves show a dominance of tidal processes at the sheltered areas of the scheme (i.e., behind the breakwaters) that diminishes as the incident wave period increases. Hence, in order to correctly predict the morphological evolution of such coast under the influence of coastal protection schemes, the tidal processes have to be studied in addition to the wave processes.
机译：为了研究潮汐流在达到形态动力学平衡的防波堤方案内的影响，使用了数值模型。为了研究潮汐流动，使用了区域数值模型中的缩小比例程序，以便研究在没有波浪的情况下由结构引起的小规模水动力变化。整个方案还考虑了小睡和春季潮汐周期不同阶段的泥沙输送过程。由于以下结构的存在，对潮流进行了重大修改：（1）主潮汐流受阻；（2）结构与海岸线之间的水流通道化，导致凸面上的水流加速。此外，还研究了改进的潮汐制度对河床沉积物输运过程的影响。发现该方案的设计特征（即缝隙宽度，离岸距离和相对于潮流的相对角度）在凸部顶部上方局部影响潮流和河床输运，从而调节其生长。尽管处在混合能量，以波浪为主的环境中，但海流与波浪之间的剪切应力比显示出该方案避难区（即防波堤后方）的潮汐过程占主导地位，该过程随着入射波周期的增加而减小。因此，为了在海岸保护方案的影响下正确预测这种海岸的形态演化，除了波浪过程外，还必须研究潮汐过程。

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  • 来源
    《Ocean Dynamics》 |2013年第3期|225-241|共17页
  • 作者

    Theocharis A. Plomaritis; Michael B. Collins;

  • 作者单位

    School of Ocean and Earth Science National Oceanography Centre Southampton University of Southampton">(1);

    Earth Science Department Faculty of Marine Science and Environment University of Cadiz">(2);

    School of Ocean and Earth Science National Oceanography Centre Southampton University of Southampton">(1);

    PiE (Plentziako Itsas Estazioa) University of the Basque Country (UPV)">(3);

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

    Sediment transport; Tidal currents; Breakwaters; Elmer;

    机译：泥沙运输;潮流防波堤;埃尔默;

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