This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.3389/fenvs.2022.979685. This is version 2 of this Preprint.
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Abstract
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.
DOI
https://doi.org/10.31223/X5303G
Subjects
Other Environmental Sciences
Keywords
macroplastics, fate modelling, plastic mobilisation thresholds, spatiotemporal macroplastic distribution, plastic transport routes, terrestrial garbage patches
Dates
Published: 2021-02-22 05:42
Last Updated: 2022-04-25 12:50
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License
CC BY Attribution 4.0 International
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Conflict of interest statement:
None
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