We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
The fate of microplastics in estuary: A quantitative simulation approach
Summary
Researchers applied quantitative numerical simulation to model microplastic transport and concentration distribution in the Yangtze Estuary, one of the world's largest plastic export pathways. The model used a mass-number method to estimate spatial distribution and risk levels of microplastics in February and May, revealing seasonal variation in transport patterns.
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.
Sign in to start a discussion.
More Papers Like This
Shape- and polymer-considered simulation to unravel the estuarine microplastics fate
Using a shape- and polymer-specific simulation model of the Yangtze River Estuary — the world's largest plastic contributor to the ocean — researchers estimated that approximately 9,766 kg of microplastics pass through the surface layer per month during peak input periods. The study also showed that resuspension of microplastics from intertidal zones significantly affects transport estimates, and introduced a new risk index that factors in particle shape, abundance, and polymer type to better identify estuarine hotspots where removal interventions could be most effective.
How the Yangtze River transports microplastic to the east China sea
Researchers used interpolation and input-output modeling to estimate how the Yangtze River transports microplastics seasonally from land to the East China Sea, finding that MP loads varied substantially by month with peak transport during high-flow periods. Tributary contributions and agricultural runoff were identified as major factors controlling MP flux to the estuary.
Small microplastic particles dominate Yangtze River particulate pollution
Researchers conducted annual monitoring of plastic particle fluxes in the Yangtze River estuary, finding that small microplastic particles dominate particulate pollution and that their distribution varies significantly by location and season, with important implications for estimating riverine plastic inputs to the sea.
Seasonal dynamics, tidal influences, and anthropogenic impacts on microplastic distribution in the Yangtze River estuary: A comprehensive characterization and comparative analysis
Researchers studied microplastic pollution in the Yangtze River estuary and found average concentrations of about 1 particle per cubic meter of surface water, mostly polystyrene, polypropylene, and polyethylene. Microplastic levels were nearly twice as high during flood season compared to dry season and decreased with distance from urban centers. These findings highlight how population density and seasonal water flow influence microplastic distribution in major waterways.
Small microplastic particles dominate Yangtze River particulate pollution
Annual field monitoring of microplastic fluxes in the Yangtze River estuary found that small particles dominated the plastic load and that abundance was spatially and temporally heterogeneous, providing the first systematic estimate of the river's annual plastic contribution to the ocean.