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Rainfall and Tidal Cycle Regulate Seasonal Inputs of Microplastic Pellets to Sandy Beaches
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Researchers assessed how rainfall and tidal cycles regulate seasonal inputs of microplastic pellets to sandy beaches at regional and local scales, using pellets as a proxy pollutant to quantify spatio-temporal variation in stranding patterns near port facilities and industrial sites. Results showed that rainfall-driven runoff and tidal dynamics are primary controls on pellet delivery to beaches, with implications for managing industrial microplastic releases to coastal environments.
Microplastic contamination of coastal environments is a global problem and pellets used in industrial processes are a persistent form of microplastic pollution. Regions that host port facilities and industries may be sources of plastic pellets to local and adjacent coastal areas. This study assessed pellet densities over regional and local scales to provide a greater understanding of the spatio-temporal variation in its inputs to sandy beaches. Pellets were used as a proxy to undertake a multi-scale assessment of the spatial (local vs. regional) and temporal (tides and weather) stranding of microplastics. Regional variation was driven by weather (i.e., rainfall) and distance from source. Local-scale variability was driven by distance from source (along shore), tidal cycle, and beach hydrodynamics. Our results address the large spatio-temporal variability in microplastic pollution and provide useful information for monitoring programs by pointing to the need to consider variability in inputs over both regional and local scales.
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A beach survey found high small-scale variability in plastic pellet abundance across the intertidal zone, driven by tidal cycles, wind, and sampling method. These findings have important methodological implications — researchers need standardized sampling designs to generate reliable estimates of microplastic contamination on beaches.
The Effects of Rainfall Events on the Composition and Diversity of Microplastics on Beaches in Xiamen City on a Short-Term Scale
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Short-term monitoring around rainfall events on Xiamen City beaches found that precipitation increased the number and diversity of microplastics in beach sediments, pointing to storm runoff as a major delivery mechanism.
Microplastic accumulation dynamics in two Mediterranean beaches with contrasting inputs
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Researchers monitored microplastic accumulation dynamics on two Mediterranean beaches with contrasting human pressures over multiple seasons, finding that beaches near urban areas accumulated MPs faster and showed greater concentration variability. Short-term accumulation events tied to storms and wind patterns were identified as key drivers of MP deposition.
Seasonal variability of microplastic transport modulated by tides: A mass-based assessment in a turbidity maximum zone
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Researchers found that tidal dynamics seasonally modulate microplastic transport in an estuary's turbidity maximum zone, with summer conditions promoting bottom enrichment and seaward decreases in particle size and abundance consistent with fragmentation and differential settling processes.
The Debris Distribution Model for Removal Planning of an Urbanized Estuarine Complex
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Researchers modeled and mapped debris stranding patterns on a Brazilian beach across different tidal and seasonal conditions, finding that buoyancy and tidal cycle were the dominant factors controlling where litter deposited. The model could help optimize beach litter removal programs by predicting accumulation zones ahead of cleanup operations.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.