一种用于模拟饲料污染物在流场输运的粒子追踪模型

A particle tracking model for simulating the drift of feed contaminants

  • 摘要: 为预测饲料污染物在流场中的输运和最终归宿,本文基于拉格朗日粒子追踪模型考虑固体沉降、风的作用以及岸线吸附等损耗过程,建立了饲料污染物的三维输运模型,并使用FVCOM模式模拟出的水动力场作为背景场,进行了饲料污染物输运的模拟实验。实验结果显示:风通过增加浅水层污染物的运动来促进其扩散;饲料密度决定了污染物在水体中的垂直分布;扩散过程增加了污染物在水平和垂直方向的扩散范围,使得污染物能在更广泛的水域中混合和输运;岸线吸附则会限制污染物在水域中的扩散范围,导致污染物在岸线附近聚集。本研究可为选择饲料的密度、投放位置和时间提供科学依据,有助于减轻饲料污染物的影响。

     

    Abstract: In order to predict the transport and final fate of feed contaminants in the flow field, this paper establishes a three-dimensional transport model of feed contaminants based on the Lagrangian particle tracking model considering the loss processes such as solid settling, wind action, and shoreline adsorption, and carries out simulation experiments of feed contaminant transport using the hydrodynamic field simulated by the FVCOM model as the background field. The experimental results showed that: wind promotes the dispersion of pollutants in the shallow water layer by increasing their movement; forage density determines the vertical distribution of pollutants in the water column; diffusion processes increase the range of pollutant dispersion in the horizontal and vertical directions, allowing pollutants to be mixed and transported in a wider range of waters; and shoreline adsorption restricts the range of pollutant dispersal in the waters, leading to the aggregation of pollutants near the shoreline. This study can provide a scientific basis for selecting the density, location and timing of feed placement, which can help to mitigate the effects of feed pollution.

     

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