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Modeling the microplastic distribution along the Delaware River Estuary: Accumulation patterns and hydrodynamic influences
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This study used computer modeling to predict how different types of microplastics accumulate along the Delaware River Estuary. Researchers found that lightweight plastics tend to collect in the upper estuary near Trenton, NJ, while heavier fibers and films accumulate downstream near the salinity front below Philadelphia. The accumulation patterns shift seasonally with river flow, providing valuable information for targeting cleanup and monitoring efforts in polluted waterways.
Microplastic pollution is an escalating environmental concern, particularly in densely populated estuary regions, where it poses significant threats to aquatic life and human health. The dispersion patterns of microplastic particles along estuaries are influenced and complicated by multiple environmental factors such as river flow, tidal mixing, salt intrusion, and estuarine circulation. This study examines the accumulation and dispersion patterns by modeling three typical classes of microplastics in the Delaware River Estuary: synthetic fibers, sinking plastic films, and rising plastic pellets. Our findings reveal specific areas with high microplastic accumulation for each type. Notably, the upper estuary regions exhibit significant retention of rising microplastics, associated with a region with reduced along-thalweg velocities downstream of Trenton, NJ and upstream of Philadelphia, PA. Conversely, synthetic fibers and sinking plastic films accumulate in the flow convergence zone near the bottom salinity front, typically downstream of Philadelphia. All of the microplastic accumulation hot spot locations are controlled by the balance of river discharge and salinity intrusions. During the dry season, microplastic accumulation hot spots shift upstream in the estuary, whereas in the wet season, the strong river discharge pushes them downstream. On the other hand, tidal mixing, settling, and resuspension processes strongly impact the spreading of microplastics along the river.
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Microplastics in the Delaware River Estuary: Mapping the Distribution and Modeling Hydrodynamic Transport
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Researchers mapped the distribution of microplastics in the Delaware River Estuary and used hydrodynamic modeling to understand how water currents transport these particles. They found that microplastic concentrations varied significantly across the estuary, with higher levels near urban and industrial areas. The study demonstrates that river and tidal dynamics play a major role in determining where microplastic pollution accumulates.
Coupled watershed and estuary modeling of microplastic transport and retention in the Delaware river basin
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Researchers built a computer model linking land and river processes to ocean currents to track how microplastics move through the Delaware River Basin to the bay. The model found that bay water circulation traps some microplastics rather than letting them flow to the ocean, and that land features like hills and city layout affect how long plastics stay on land before washing away.
Microplastic concentration, characterization, and size distribution in the Delaware Bay estuary
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Researchers measured microplastic concentrations and composition in the Delaware Bay estuary across two sampling campaigns. The study found that polyethylene and polypropylene were the dominant polymer types, and the highest microplastic levels were observed near visible debris along frontal zones, suggesting that estuarine dynamics play an important role in shaping microplastic distribution.
Observations and Simulations of Microplastic Debris in a Tide, Wind, and Freshwater-Driven Estuarine Environment: the Delaware Bay
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Researchers sampled microplastic concentrations in Delaware Bay and used high-resolution numerical modelling to simulate transport of buoyant particles driven by tides, wind, and freshwater inputs, finding average concentrations of 0.19-1.24 pieces/m3 with higher values in the upper bay near the estuarine turbidity maximum. Model results predicted that buoyant microplastic distributions become highly patchy within hours and can vary by a factor of 1000 within a single tidal cycle.
Microplastic accumulation and vertical distribution in the Delaware Estuary estuarine turbidity maximum
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Researchers studied microplastic accumulation in the Delaware Estuary's turbidity maximum zone — a region where tidal currents concentrate suspended particles — and found microplastics present throughout the water column at all sampling stations. Particle modeling helped explain how estuary dynamics trap and concentrate plastic debris, making estuaries more efficient sinks for microplastics than the open ocean. This adds to evidence that coastal urban estuaries are significant accumulation zones where microplastics can be ingested by filter feeders and enter food chains.
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