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探索沉积物运动对河床微塑料沉积的影响

Eshel Peleg¹, Yoni Teitelbaum¹, Shai Arnon¹

¹Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Israel.

|December 15, 2023

概括

流床运动显著影响微塑料 (MP) 沉积,导致长期积累,即使最初的颗粒太大而无法沉降. 忽视河床动态导致MP在河流中的命运预测不准确.

科学领域:

环境科学环境科学
水文学的水文学
环境化学环境化学

背景情况:

微塑料 (MP) 在河床中无处不在,但沉积机制,特别是移动的细沉积物床,人们对其了解甚少.
之前的研究还没有系统地探索动态流床环境中的MP传递和积累过程.

研究的目的:

量化溪床运动对河流沉积物中的微塑料沉积和积累的影响.
通过使用数值建模,在不同的流速和沉积物颗粒大小下调查MP命运.

主要方法:

在数值流量和运输模型中使用粒子跟踪模拟.
基于流水速度 (0.1-0.5 m/s) 和中位粒大小 (0.15-0.6 mm) 的模拟流床形态学.
采用过系数来模拟MP在多孔介质中的捕获在各种场景中.

主要成果:

沉积物循环促进了微塑料的埋葬和长期沉积,包括那些以前因大小而被排除在外的微塑料.
局部化的MP沉积物在细沉积物流床中的移动沉积物部分下形成水平层.
增加的流量速度降低了流床内的微塑料沉积深度.

结论:

忽视流床运动的模型可能错误计算了微塑料沉积,保留,再悬浮和长期积累.
了解沉积物动态对于准确评估水生生态系统中的微塑料命运至关重要.

关键词:

床的形状床的形状过的过方式低度的汇率流动是低度的汇率流.塑料塑料的塑料的波的波是因为波的波.沉积物运动的沉积物运动

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