Investigation of the Sheltering Effects on the Mobilization of Microplastics in Open-Channel Flow

Zijian Yu; Mark Loewen; Shuai Guo

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Investigation of the Sheltering Effects on the Mobilization of Microplastics in Open-Channel Flow

机译：Investigation of the Sheltering Effects on the Mobilization of Microplastics in Open-Channel Flow

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Microplastics (MPs) can be sheltered by bed grains, resulting in a higher threshold of mobilization compared with those moving on a smooth bed. Only one formula considering the sheltering effects has been proposed for the critical shear stress (rc) of MP mobilization by including the densities and sizes of MPs and bed grains, but it is inaccurate for MPs of certain materials such as PS and shows limitations in understanding the sheltering effects. Additionally, no method exists for the critical depth-averaged velocity (17C). In this study, experiments were conducted measuring both tc and Uc of MPs (made of PA, PVC, and PET) deposited on rough beds of different roughnesses, with a focus on the sheltering effects. A power law relationship between rc and the density and size of MPs was found, and a new formula for estimating rc was proposed for MPs, which reduced the errors by approximately 40% compared with that of the previous formula (27.8%). To explicitly quantify the sheltering effects in MP mobilizations, hiddenness (AZ), exposure (AH), and longitudinal exposure (AX) were introduced, all of which were observed to follow a normal distribution. A semiempirical method for Uc was then proposed incorporating the new measures, which reduced the errors by around 70% compared to the methods developed for estimating the Uc values of sediments.

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来源
《Environmental Science & Technology: ES&T》 |2023年第30期|11259-11266|共8页
作者
Zijian Yu; Mark Loewen; Shuai Guo;
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作者单位

Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, Canada T6G 1H9;

Department of Civil and Environmental Engineering University of Alberta, Edmonton, AB, Canada T6G 1H9;

Department of Municipal Engineering Hefei University of Technology, Hefei 230009, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
Microplastics; Incipient motion; Critical flow velocity; Critical shear stress; Sheltering effects;

Investigation of the Sheltering Effects on the Mobilization of Microplastics in Open-Channel Flow

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