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首页> 外文期刊>Ocean Dynamics >Tidal-driven dynamics and mixing processes in a coastal ocean model with wetting and drying
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Tidal-driven dynamics and mixing processes in a coastal ocean model with wetting and drying

机译：湿润和干燥的沿海海洋模型中潮汐驱动的动力学和混合过程

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摘要

A three-dimensional sigma coordinate numerical model with wetting and drying (WAD) and a Mellor-Yamada turbulence closure scheme has been used in an idealized island configuration to evaluate how tidally driven dynamics and mixing are affected by inundation processes. Comprehensive sensitivity experiments evaluate the influence of various factors, including tidal amplitudes (from 1- to 9-m range), model grid size (from 2 to 16 km), stratification, wind, rotation, and the impact of WAD on the mixing. The dynamics of the system involves tidally driven basin-scale waves (propagating anticlockwise in the northern hemisphere) and coastally trapped waves propagating around the island in an opposite direction. The evolutions of the surface mixed layer (SML) and the bottom boundary layer (BBL) under different forcing have been studied. With small amplitude tides, wind-driven mixing dominates and the thickness of the SML increases with time, while with large-amplitude tides, tidal mixing dominates and the thickness of the BBL increases with time. The inclusion of WAD in the simulations increases bottom stress and impacts the velocities, the coastal waves, and the mixing. However, the impact of WAD is complexrnand non-linear. For example, WAD reduces near-coast currents during flood but increases currents during ebb as water drains from the island back to the sea. The impacts of WAD, forcing, and model parameters on the dynamics are summarized by an analysis of the vorticity balance for the different sensitivity experiments.
机译：在理想化的岛形配置中，使用了具有湿润和干燥（WAD）的3维sigma坐标数值模型和Mellor-Yamada湍流闭合方案，以评估潮汐驱动的动力和混合如何受淹没过程影响。全面的敏感性实验评估了各种因素的影响，包括潮汐幅度（从1到9-m范围），模型网格大小（从2到16 km），分层，风，旋转以及WAD对混合的影响。该系统的动力学涉及潮汐驱动的盆地尺度波（在北半球逆时针传播）和沿相反方向在岛周围传播的沿海陷波。研究了在不同作用力下表面混合层（SML）和底部边界层（BBL）的演化。对于小幅度的潮汐，风力混合占主导地位，SML的厚度随时间增加；而对于大幅度的潮汐，潮汐混合占主导地位，而BBL的厚度随时间增加。在模拟中包含WAD会增加底部应力并影响速度，沿海波浪和混合。但是，WAD的影响是复杂且非线性的。例如，当水从岛上流回大海时，WAD减少了洪水期间的近岸海流，但在退潮期间增加了海流。通过对不同灵敏度实验的涡度平衡进行分析，总结了WAD，强迫和模型参数对动力学的影响。

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  • 来源
    《Ocean Dynamics》 |2010年第2期|p.461-478|共18页
  • 作者

    Suriyan Saramul; Tal Ezer;

  • 作者单位

    Center for Coastal Physical Oceanography, Old Dominion University, 4111 Monarch Way, Norfolk, VA 23508, USA;

    Center for Coastal Physical Oceanography, Old Dominion University, 4111 Monarch Way, Norfolk, VA 23508, USA;

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

    numerical modeling; wetting and drying; inundation; mixing; tides;

    机译：数值建模;润湿和干燥;淹没混合;潮汐;

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