微塑料
生物扩散
环境科学
水槽(地理)
泥沙输移
生态系统
污染物
生态学
环境化学
水文学(农业)
海洋学
沉积物
地质学
人口
化学
生物
地理
地貌学
社会学
人口学
岩土工程
地图学
作者
Beibei He,Mitchell Smith,Prasanna Egodawatta,Godwin A. Ayoko,Llew Rintoul,Ashantha Goonetilleke
标识
DOI:10.1016/j.envpol.2021.116884
摘要
Rivers are viewed as major pathways of microplastic transport from terrestrial areas to marine ecosystems. However, there is paucity of knowledge on the dispersal pattern and transport of microplastics in river sediments. In this study, a three dimensional hydrodynamic and particle transport modelling framework was created to investigate the dispersal and transport processes of microplastic particles commonly present in the environment, namely, polyethylene (PE), polypropylene (PP), polyamide (PA), and polyethylene terephthalate (PET) in river sediments. The study outcomes confirmed that sedimental microplastics with lower density would have higher mobility. PE and PP are likely to be transported for a relatively longer distance, while PA and PET would likely accumulate close to source points. High water flow would transport more microplastics from source points, and high flow velocity in bottom water layer are suggested to facilitate the transport of sedimental microplastics. Considering the limited dispersal and transport, the study outcomes indicated that river sediments would act as a sink for microplastic pollutants instead of being a transport pathway. The patchiness associated with the hotspots of different plastic types is expected to provide valuable information for microplastic source tracking.
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