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首页> 外文期刊>Journal of oceanography >Analytical Study of Longitudinal Mass Flux Due to the Shear Effect in a Tidal Basin
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Analytical Study of Longitudinal Mass Flux Due to the Shear Effect in a Tidal Basin

机译：潮汐盆地剪切作用引起的纵向质量通量的分析研究

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The fundamental nature of the mass flux due to the shear effect is examined analytically in a basin with steady and oscillatory currents to promote a better understanding of the mass transport process in coastal waters. The currents are given from solutions of the simplified motion equation so as to be consistent with the diffusion equation. The matter concentration used is given by an analytical solution of the diffusion equation with the settling flux term contained. Mass flux, yielding the depth-averaged dispersion coefficient, is rather varied vertically in both steady and oscillatory currents. In the oscillatory current with a Stokes layer in particular, the vertical profile of flux is more complicated and even negative flux is induced near the basin floor. This negative flux does not necessarily yield a negative value of the vertically averaged dispersion coefficient. The exact dispersion coefficient given by the flux analysis is realized only in the steady state of the matter concentration distribution, though we can scarcely observe the steady state in the actual sea. The vertically uniform longitudinal dispersion coefficient at the stationary stage is shown to be caused from the vertical complexity of mass flux by the action of the vertical diffusing and the settling flux.
机译：在具有稳定和振荡电流的流域中，对由剪切作用引起的质量通量的基本性质进行了分析，以促进对沿海水域的质量输运过程的更好理解。从简化运动方程的解中给出电流，以便与扩散方程一致。所用物质浓度由包含稳定通量项的扩散方程的解析解给出。产生深度平均弥散系数的质量通量在稳定电流和振荡电流中都垂直变化。特别是在具有斯托克斯层的振荡电流中，通量的垂直分布更加复杂，甚至在池底附近也感应出负通量。该负通量不一定会产生垂直平均色散系数的负值。通量分析给出的精确色散系数仅在物质浓度分布的稳态下才能实现，尽管我们几乎无法观察到实际海中的稳态。示出了在静止阶段的垂直均匀的纵向弥散系数是由质量通量的垂直复杂性通过垂直扩散和沉降通量的作用引起的。

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