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Urban water systems as entry points for river plastic pollution
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Researchers found that the urban canal network of Amsterdam contributes an estimated 2.7 million plastic items per year to the adjacent IJ River, demonstrating that urban water systems are significant and underappreciated entry points for river plastic pollution.
Abstract Accumulation of plastic in aquatic environments negatively impacts ecosystems and human livelihood. Urban areas are assumed to the main source of plastic pollution in these environments, because of high anthropogenic activity. Yet, the drivers of plastic emissions, abundance and retention within these systems and subsequent transport to river systems is poorly understood. In this study, we demonstrate that urban water systems function as major contributors to river plastic pollution, and explore the potential driving factors contributing to the transport dynamics. Monthly visual counting of floating litter at six outlets of the Amsterdam water system results in an estimated 2.7 million items to enter the closely connected IJ river annually, ranking it among the most polluting systems measured in the Netherlands and Europe. Subsequent analyses of environmental drivers (including rainfall, sunlight, wind speed and tidal regimes) and litter flux showed no strong correlations (r = -0.19 - 0.16), implying additional investigation of potential drivers is required. High frequency observations at various locations within the urban water system and advanced monitoring using novel technologies could be explored to harmonize and automate monitoring. Once litter type and abundance are well-defined with a clear origin, communication of the results with local communities and stakeholders could help co-develop solutions and stimulate behavioural change geared to reduce plastic pollution in urban environments.
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Amsterdam urban water system as entry point of river plastic pollution
AI summary Read the abstract
Researchers measured floating plastic litter at six outlets of the Amsterdam urban water system and estimated that approximately 2.7 million items enter the connected IJ river each year. The study identified urban waterways as major contributors to river plastic pollution, ranking Amsterdam among the most significant sources. The findings highlight the important but often overlooked role of city canal systems as pathways for plastic entering rivers and eventually the ocean.
The complex nature of the urban plastic soup
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Researchers tracked nearly 10,000 plastic items across Amsterdam's waterways over 12 months and found that plastic accumulation and transport follow distinct spatial patterns driven by different urban environmental features, with most plastic types showing no simple correlation with neighborhood characteristics, underscoring the complexity of identifying true urban plastic sources.
The complex nature of the urban plastic soup
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Researchers mapped nearly 10,000 plastic items across Amsterdam's waterways over 12 months, finding that plastic accumulation and transport patterns vary sharply by location and season and correlate with distinct urban contexts like hospitality hubs and transit nodes, with most item types defying simple spatial explanations.
Microplastics in urban freshwater : a case study in the city of Amsterdam
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This study measured microplastic concentrations in urban freshwater in Amsterdam, the Netherlands, finding widespread contamination across the city's canal network. Urban waterways receive microplastics from multiple sources including stormwater runoff, wastewater overflows, and direct littering.
Plastic pathways and intervention strategies in urban water systems
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A mass-flow analysis of 9,968 floating plastic items across 20 locations in Amsterdam's urban water system found that the top ten plastic item types comprise 80% of total items, and end-of-life littering causes disproportionate environmental harm relative to its small share of total plastic use. The study proposes seven targeted interventions — prioritizing waste reduction over collection — to prevent an estimated 16 metric tons of plastic from entering the IJ River annually, directly reducing microplastic precursor loads.
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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.