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The Plastic Pathfinder: A Macroplastic Transport and Fate Model for Terrestrial Environments
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Researchers introduced the Plastic Pathfinder, a computer model that simulates how plastic waste moves across land through wind, rain, and river systems before reaching the ocean. The model helps identify key transport pathways and accumulation hotspots, which is critical information for targeting plastic pollution interventions.
Land-based plastic waste is the major source for freshwater and marine plastic pollution. Yet, the transport pathways over land remain highly uncertain. Here, we introduce a new conceptual model to forecast plastic transport on land: the Plastic Pathfinder; a numerical model that simulates the spatiotemporal distribution of macroplastic (>0.5 cm) at a river basin scale. The plastic transport driving forces are wind and surface runoff, while plastic transport is resisted by terrain surface friction. The terrain surface friction, a function of the slope and land use, is converted into thresholds that define the critical wind and surface runoff conditions required to mobilise and transport macroplastic waste. When the wind and/or surface runoff conditions exceed their respective thresholds, the model simulates the transport and (re)distribution of plastics, resulting in plastic accumulation hotspots maps and high probability transport route maps. The Plastic Pathfinder contributes to a better mechanistic understanding of plastic transport through terrestrial environments, and upon future calibration and validation, can serve as a practical tool to optimise plastic waste prevention, mitigation, and reduction strategies.
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Researchers developed the first catchment-scale model successfully predicting microplastic transport from land to water, validated against field data, revealing how soil accumulation, runoff dynamics, and in-stream transport interact to determine where microplastics concentrate before reaching the ocean.
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Researchers used computer modeling to simulate how microplastics move and accumulate along Portugal's coastline. The modeling approach helps identify areas of highest plastic concentration and informs strategies to reduce microplastic pollution in marine environments.
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Macroplastic fate and transport in an Amazonian Estuarine System: A Lagrangian Modelling Approach
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Scientists used computer models to track how large plastic waste travels from the city of Belém, Brazil through rivers and waterways to the ocean. They found that plastic pollution gets stuck in certain areas during low water periods but moves quickly to the ocean during high water periods, creating pollution hotspots near the city. This research helps identify where plastic waste accumulates so communities can better target cleanup efforts and prevent this pollution from reaching the ocean and potentially entering our food chain.
Geometry-Driven Prediction of Microplastic Transport in Saturated Sediments: Fast and Memory-Efficient Pore-Scale Modeling
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Scientists developed a new computer model that can predict how fast tiny plastic particles move through soil and sediment when water flows through them. This matters because microplastics can carry harmful chemicals like pesticides and heavy metals as they travel underground, potentially contaminating drinking water sources and groundwater. The model helps researchers understand where these plastic pollutants might end up and how quickly they could reach water supplies that people depend on.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.