We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Transport dynamics of microplastics from land to sea: the role of particle properties and stream morphology.
Summary
Researchers used the nutrient spiraling technique to measure how quickly microplastics of different sizes, densities, and polymer types travel and settle in 15 streams with varying levels of human modification. Particle properties and stream geomorphology both significantly influenced transport distances and deposition velocities.
Rivers and streams are the primary conduits through which microplastic pollution moves from land to sea. Attributes of the plastic and of the streams are both likely to influence how microplastic moves, but there are few empirical studies of plastic transport dynamics in real systems. We adapted the spiralling technique commonly used to measure nutrient cycling in streams to quantify transport distances and deposition velocities of microplastics in streams with varying geomorphological structure and level of human modification. We conducted pulse releases of trace amounts of three size classes of five different polymers spanning a density gradient in fifteen streams. The streams were typical of the range of human modification in urban environments, from semi-natural to highly modified. A range of geomorphological and hydrological parameters were quantified in each stream. Transport distances of microplastic ranged from Also see: https://micro2024.sciencesconf.org/558661/document
Sign in to start a discussion.
More Papers Like This
Transport dynamics of microplastics from land to sea: the role of particle properties and stream morphology.
Researchers measured how particle properties including size, density, and polymer type interact with stream morphology to determine microplastic transport distances in 15 streams. Both plastic characteristics and stream structure independently influenced how far microplastics travel before settling, with implications for estimating fluxes to the ocean.
Factors Controlling Transport Dynamics of Microplastics in Streams
Researchers tracked how microplastics of different sizes and polymer types travel through 15 urban streams with varying levels of human modification. They found that smaller, denser particles traveled shorter distances and settled faster, while stream channel complexity and flow conditions strongly influenced transport patterns. The study provides some of the first field-based measurements of how microplastics move through real waterways on their journey from land to sea.
The effects of stream water velocity, streambed celerity, and particle properties on microplastic deposition in streams
Researchers conducted laboratory flume experiments to examine how stream water velocity, bedform movement, and microplastic particle properties (material type PET/PP/PA and fiber length 25-200 µm) influence the deposition dynamics of microplastics in sandy streambeds, finding that bedform movement and particle characteristics significantly affected deposition rates and sediment distribution patterns.
Comprehensive review of the co-transport of microplastics and suspended sediments in aquatic environments: macroscopic transport and microscopic mechanisms
Researchers reviewed how microplastics and suspended sediments interact and travel together through rivers, lakes, and coastal waters, identifying water flow conditions, particle density, and plastic shape as key factors governing their joint migration and deposition. Understanding these co-transport dynamics is essential for predicting where microplastics accumulate and assessing their ecological risks.
Microplastic deposition velocity in streams follows patterns for naturally occurring allochthonous particles
Using particle-spiraling metrics adapted from organic matter studies, researchers found that microplastic deposition velocity in streams followed patterns similar to natural particles, enabling predictions of riverine microplastic retention.