We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Integrated numerical modeling of microplastic transport in fluvial systems
AI summary Read the abstract
This study developed an integrated numerical model for microplastic transport in rivers that accounts for both surface water flow and exchange with the hyporheic zone — the subsurface region where river water mixes with groundwater. Including hyporheic exchange improved predictions of microplastic storage and remobilization compared to surface-only models. The work helps explain why microplastics are often found at higher concentrations in river sediments than in the water column.
Although rivers and streams are major transport vectors of microplastics into the marine environment, little research has been conducted to understand the transport behavior of microplastic particles in fluvial systems. This work contributes to the understanding of these transport processes, specifically focusing on the interface of the surface water flow and the hyporheic zone.Transport of microplastic particles in fluvial systems is currently modeled mainly at larger, river- or basin-wide scales using existing hydrodynamic and sediment transport models. To investigate the transport behavior of microplastic particles along the interface between the hyporheic zone and the open water flow domain, smaller-scale models are required so that the complex processes in this region can be adequately represented and analyzed.To this end, a novel modeling technique will be presented based on the open source CFD toolbox OpenFOAM. It combines a new coupling approach for the hydrodynamic processes in the surface water and hyporheic zone with transport modeling of microplastics.The methodology considers the latest findings regarding deposition and resuspension of microplastic particles as well as the hyporheic exchange in a fully coupled model. The model is validated by accompanying flume experiments and relevant transport processes are identified from the presented scenario simulations.
More Papers Like This
Integrated modeling of microplastics in the hyporheic zone
AI summary Read the abstract
A combined field and modeling study investigated how microplastics interact with the hyporheic zone — the region of sediment beneath and alongside rivers where surface water and groundwater mix. The study found that microplastics can be transported into and retained in hyporheic sediments through infiltration processes, acting as a significant and poorly understood sink. Better models of hyporheic microplastic dynamics are needed to accurately account for plastic retention in river systems.
Integrated numerical modeling to quantify transport and fate of microplastics in the hyporheic zone
AI summary Read the abstract
Researchers developed an integrated numerical model to simulate microplastic transport and retention in the hyporheic zone beneath streambeds, finding that particle size, density, and streambed morphology significantly influence microplastic infiltration dynamics.
Microplastic accumulation in riverbed sediment via hyporheic exchange from headwaters to mainstems
AI summary Read the abstract
Researchers developed a model showing that hyporheic exchange between river surface water and sediment causes long-term microplastic retention, with headwater residence times averaging 5 hours per kilometer but increasing to 7 years per kilometer during low-flow conditions.
An Experimental Method to Quantitatively Assess the Transport of Microplastic Particles in Fluvial Systems
AI summary Read the abstract
Researchers developed an experimental method to quantitatively measure how microplastic particles behave when transported through fluvial (river) systems, including both surface flow and subsurface hyporheic zones. The study provides much-needed empirical data on microplastic transport mechanisms in rivers, which are key pathways for delivering plastic pollution to the ocean.
Significance of Hyporheic Exchange for Predicting Microplastic Fate in Rivers
AI summary Read the abstract
Researchers modeled the role of hyporheic exchange — water flow between rivers and streambed sediments — in driving microplastic delivery and retention in riverbeds, finding that this process significantly increases the rate at which small and positively buoyant microplastics are transported into streambed sediments. The study highlights hyporheic exchange as an underappreciated mechanism controlling microplastic fate in freshwater environments.
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.