Modeling Microplastic and Solute Transport in Vegetated Flows
Modeling Microplastic and Solute Transport in Vegetated Flows
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DOI：
10.1029/2023wr034653
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发表时间：
2023-05
影响因子：
5.4
通讯作者：
Ben Stride;S. Abolfathi;M. Odara;G. Bending;J. Pearson
中科院分区：
文献类型：
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作者：
Ben Stride;S. Abolfathi;M. Odara;G. Bending;J. Pearson
人们对微塑料在植被和淡水系统湍流中的物理相互作用知之甚少。进行了一项实验研究，以调查在自然环境中常见的一系列流动条件下，微塑料在淹没冠层上的潜在物理传输机制。改变冠层高度的影响进行了研究，通过测试两个模型冠层不同的茎高度，模拟季节变化。本研究利用荧光示踪技术确定并比较了微塑料和溶质的混合和分散过程。基于对流弥散方程建立了一个水动力学模型，用于量化淹没冠层中的微塑性混合。中性浮力微塑料（聚乙烯）和溶质的纵向分散系数显着相关的淹没模型植被内的复杂性的流动制度无关。流体动力学和溶质运移模型被证明能够稳健地预测中性浮力微塑料在冠层环境流中的混合，从而促进了一种新的方法来量化微塑料的运移和归宿。我们比较了微塑料和溶质的混合过程，然后提出了一个流体动力学模型，用于量化淹没冠层中的混合。
Physical interactions of microplastics within vegetation and turbulent flows of freshwater systems are poorly understood. An experimental study was conducted to investigate the underlying physical transport mechanisms of microplastics over submerged canopies across a range of flow conditions common in the natural environment. The effects of changing canopy heights were investigated by testing two model canopies of varying stem heights, simulating seasonal variation. This study determined and compared the mixing and dispersion processes for microplastics and solutes utilizing fluorometric tracing techniques. A hydrodynamic model was developed based on the advection‐dispersion equation for quantifying microplastic mixing in submerged canopies. Longitudinal dispersion coefficients for neutrally buoyant microplastics (polyethylene) and solutes were significantly correlated within submerged model vegetation irrespective of the complexity of the flow regime. Hydrodynamic and solute transport models were shown to be capable of robust predictions of mixing for neutrally buoyant microplastics in environmental flows over a canopy, facilitating a new approach to quantify microplastic transport and fate. We compare the mixing processes for microplastics and solutes then propose a hydrodynamic model for quantifying the mixing in submerged canopies.