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首页> 外文期刊>Ocean Dynamics >Impact of horizontal eddy diffusivity on Lagrangian statistics for coastal pollution from a major marine fairway
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Impact of horizontal eddy diffusivity on Lagrangian statistics for coastal pollution from a major marine fairway

机译：水平涡流扩散对主要海洋航道沿岸污染的拉格朗日统计的影响

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摘要

Lagrangian trajectory methods are often applied as deterministic transport models, where transport is due strictly to advection without taking into account stochastic elements of particle dispersion, which raises questions about validity of the model results. The present work investigates the impact of horizontal eddy diffusivity for a case study of coastal pollution in the Gulf of Finland, where the pollutants are assumed to originate from a major fairway and are transported to the coast by surface currents. Lagrangian trajectories are calculated using the TRACMASS model from velocity fields calculated by the Rossby Centre circulation model for 1982 to 2001. Three cases are investigated: (1) trajectory calculation without eddy diffusivity, (2) stochastic modelling of eddy diffusivity with a constant diffusion coefficient and (3) stochastic modelling of eddy diffusivity with a time- and space-variable diffusion coefficient. It is found that the eddy diffusivity effect increases the spreading rate of initially closely packed trajectories and the number of trajectories that eventually reach the coast. The pattern of most frequently hit coastal sections, the probability of hit to each such section and the time the pollution spends offshore are virtually invariant with respect to inclusion of eddy diffusivity.
机译：拉格朗日轨迹方法通常用作确定性的输运模型，其中的输运完全是由于对流而没有考虑颗粒分散的随机因素，这引起了有关模型结果有效性的问题。本工作调查了水平涡流扩散率对芬兰湾沿岸污染的案例研究的影响，其中假定污染物源自主要航道，并通过地表流运至海岸。拉格朗日轨迹是使用TRACMASS模型从1982年至2001年由Rossby Center环流模型计算出的速度场计算得出的。研究了三种情况：（1）无涡流扩散率的轨迹计算；（2）恒定扩散系数涡流扩散率的随机模型（3）具有随时间和空间变化的扩散系数的涡流扩散率的随机模型。发现涡流扩散效应增加了最初紧密堆积的轨迹的扩散率和最终到达海岸的轨迹的数量。相对于涡流扩散率而言，最常遭受袭击的沿海地区的模式，遭受袭击的每个地区的可能性以及污染物在海上花费的时间实际上是不变的。

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