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Physical processes matters! Recommendations for sampling microplastics in estuarine waters based on hydrodynamics
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This methodological review discusses how estuarine hydrodynamics create challenges for representative microplastic sampling, recommending standardized protocols that account for tidal cycles, salinity gradients, and seasonal variability to ensure comparability of data across different estuary systems.
Monitoring the abundance and characteristics of microplastics in estuarine waters is crucial for understanding the fate of microplastics at the land-sea continuum, and for developing policies and legislation to mitigate associated risks. However, if protocols to monitor microplastic pollution in ocean waters or beach sediments are well established, they may not be adequate for estuarine environments, due to the complex 3D hydrodynamics. In this note, we review and discuss sampling methods and strategies in relation to the main environmental forcing, estuarine hydrodynamics, and their spatio-temporal scales of variability. We propose recommendations about when, where and how to sample microplastics to capture the most representative picture of microplastic pollution. This note opens discussions on the urgent need for standardized methods and protocols to routinely monitor microplastics in estuaries which should, at the same time, be easily adaptable to the different systems to ensure consistency and comparability of data across different studies.
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Sampling microplastics in estuarine environments: lessons learned from suspended sediment dynamics and perspectives.
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This paper reviews the challenges of sampling microplastics in estuaries, where tidal flows and suspended sediment make collection methods complex and inconsistent. The authors call for standardized protocols that account for the unique dynamics of estuarine environments to improve comparability across studies.
Hydrodynamic controls on microplastic transport in tidal estuaries: A process-based review and conceptual framework
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This review pulls together existing research to show that tides act like a pump for microplastic pollution in estuaries — some tide patterns flush plastic particles out to the ocean, while others trap and recirculate them near coastlines where seafood is harvested. Understanding these patterns matters because it helps scientists predict where microplastics build up in the water we fish from, and could improve how we monitor and eventually reduce human exposure through contaminated seafood.
Influence of estuarine physical processes in the transport of microplastics: a modelling study in the Gironde estuary
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Researchers developed a hydrodynamic model to investigate how estuarine physical processes in the Gironde estuary influence the transport and distribution of microplastics, examining the role of tidal currents, salinity gradients, and fluvial discharge on particle fate. The modelling study provides insight into the mechanisms controlling microplastic accumulation and export in estuarine environments.
Horizontal variation of microplastics with tidal fluctuation in the Chao Phraya River Estuary, Thailand
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Microplastic concentrations and composition in the Chao Phraya River Estuary in Thailand varied with tidal cycle, with flood tides increasing marine-sourced particles and ebb tides flushing river-derived fragments, showing that tidal dynamics must be accounted for in estuarine microplastic sampling designs.
How does the tidal cycle influence the estuarine dynamics of microplastics?
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Researchers investigated how tidal cycles influence the abundance and characteristics of microplastics in an urban estuary, finding that tidal dynamics significantly affect MP transport dynamics and that estuaries serve as a major conduit for MP transfer from rivers to the ocean.
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.