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首页> 外文期刊>Journal of Marine Environmental Engineering >Tidal Straining, Mixing and Lagrangian Flow Residuals Around Headlands
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Tidal Straining, Mixing and Lagrangian Flow Residuals Around Headlands

机译：岬角周围的潮汐应变，混合和拉格朗日流量残差

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Tidal flow past an idealized triangular headland was investigated using an explicit finite difference solver for the equations of shallow water flow. Flow separation and transient eddies developed downstream from the tip of the headland on each successive half tidal cycle. Details of the flow patterns were studied using Lagrangian particle tracks. Mixing and dispersion diagrams were created that showed the effect of the eddies on sets of colour-coded particles. These revealed both the inter-mixing of water masses originally located on each side of the headland and the straining of discrete volumes of water originating from locations seaward of the headland tip. The pattern of Eulerian tidal residuals was contrasted with the pattern of Lagrangian tidal residuals. The patterns were found to be very different from one another; the Lagrangian residuals revealed complex detail with some systematic features. It is only the Lagrangian residuals that can be used to make valid inferences about the mixing of dissolved or suspended material when the length-scale of the tidal excursion is similar to the size of the headland and of the eddies. In such cases, the use of the Eulerian residuals is invalid. The mixing rates were also quantified by evaluating the effective diffusion coefficient for the eddy system. Four distinct stages of development of dispersion were identified and elucidated by the use of mixing diagrams. The impact of transient eddies was shown to be confined to a distinct mixing zone within which high rates of strain and diffusion were observed.
机译：使用显式有限差分求解器研究了浅水流方程，研究了流过理想三角形岬角的潮汐流。在每个连续的半个潮汐周期中，水流分离和瞬态涡流在岬角尖端的下游发展。使用拉格朗日粒子轨迹研究了流态的细节。创建了混合图和分散图，显示了涡流对多组颜色编码的粒子的影响。这些都揭示了原本位于岬角两侧的水团的相互混合以及源于岬角尖端向海位置的离散水的过滤。欧拉潮汐残差的模式与拉格朗日潮汐残差的模式形成对比。发现这些模式彼此非常不同。拉格朗日残差揭示了具有系统特征的复杂细节。当潮汐偏移的长度尺度与岬角和涡流的大小相似时，只有拉格朗日残差可以用于得出有关溶解或悬浮物质混合的有效推论。在这种情况下，使用欧拉残差是无效的。还通过评估涡流系统的有效扩散系数来量化混合速率。通过使用混合图鉴定并阐明了分散体发展的四个不同阶段。瞬态涡流的影响被显示为局限于一个独特的混合区域，在该区域内观察到了高应变和扩散速率。

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