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综合数值建模以量化微塑料在低温区的运输和命运

Franz Dichgans¹, Jan-Pascal Boos², Pouyan Ahmadi¹

¹Helmholtz Centre for Environmental Research - UFZ, Department Hydrogeology, Permoserstr. 15, 04318 Leipzig, Germany.

|July 23, 2023

概括

这项研究模拟了河流中的微塑料 (MP) 运输,发现对小颗粒有效,但对较大的颗粒不那么有效. 这项研究增强了对河流系统中MP运动的理解.

科学领域:

环境科学环境科学
水文学水文学
生态毒理学生态毒理学

背景情况:

河流是微塑料进入海洋环境的关键通道.
了解MP在河流系统中的行为,特别是透和运输在低沉积物中的行为是有限的.
目前的研究缺乏在流床接口上的MP动态的详细见解.

研究的目的:

研究微塑料 (MP) 在河流系统中的运输和保留动态.
开发和验证MP在河流中运动的数值建模方法.
根据实验数据,评估不同MP大小 (1微米和10微米) 的模型准确性.

主要方法:

开发了一个数值模型作为流体实验的数字双胞胎.
根据实验数据验证模型,包括MP度模式和流量.
模拟的运输和透1微米和10微米的MP粒子在沙溪床.

主要成果:

吸附-分散方程足够地表示在低孔区域 (HZ) 内的孔尺度1微米MP的运输.
较大的10微米MP显示了延迟的透和传输,该模型捕捉了空间范围,但没有完全复制低度传输时间.
该研究提供了MP运输模型与实验数据的首次明确验证,涵盖了定性和定量方面.

结论:

综合建模方法为MP的运输和在河流中的保留提供了有价值的见解.
该研究强调了该模型在代表MP运动方面的优势,以及其在准确预测传输时间方面的局限性.
这项研究显著提高了对河流环境中微塑料动态的理解.

关键词:

计算流体动力学 (CFD) 是一种计算流体动力学.希波雷斯的交换方式低气候地区 (hyporheic zone) 是一个低气候地区.微塑料是一种微塑料.开放式的泡

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