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The fate of microplastics in estuary: A quantitative simulation approach

Accepted version
Peer-reviewed

Type

Article

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Authors

Shen, Zilin 
Wang, Hua 
Zeng, Yichuan 

Abstract

Microplastics pollution is an emerging environmental concern. However, there are almost no MPs numerical simulation studies in the Yangtze Estuary which is considered as the largest plastic export in the world and quantitative simulation is not carried out in the existing models. Therefore, completing quantitative simulation and exploring different patterns of MPs transport are the main objectives of this study. In addition, the concentration distribution and risk of MPs are also analyzed. Mass-Number method is proposed to quantitatively simulate microplastics concentration in Feb. and May with errors of less than 18%. Compared with sediment flocculation and settling transport, independent floating transport is more susceptible to surface currents resulting in increased beaching and more inhomogeneous concentration distribution. Meanwhile, under the influence of current, local topography and salt wedge, the MPs perform linear motion and clockwise spiral motion inside and outside the estuary and rapidly form a "hot spot" on the southeastern part of Chongming Island and 57% to 90% of MPs are beached or settled inside the estuary, especially on the north shore. Therefore, MPs risk in some sensitive targets should be concerned according to risk assessment results. Our results break the space-time limit and explore the fate of MPs in the Yangtze Estuary and provide new idea and concern of MPs numerical simulation.

Description

Keywords

Microplastics, Pollution risk, Quantitative simulation, Transport patterns, Microplastics, Estuaries, Plastics, Environmental Monitoring, Water Pollutants, Chemical, Geologic Sediments

Journal Title

Water Research

Conference Name

Journal ISSN

0043-1354
1879-2448

Volume Title

Publisher

IWA Publishing