![]() ![]() Here, we measured photodegradation rates of different plastic types slightly larger than microplastics (virgin polymers and foating plastic debris) under simulated marine conditions. Solar ultraviolet (UV) radiation can induce photodegradation, but its importance in determining the longevity of foating plastic remains unconstrained. Ocean plastic pollution is a problem of increasing magnitude yet, the amount of plastic at the sea surface is much lower than expected. Collaborators: NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Microbiology & Biogeochemistry (NL), University of Vigo, Biological Oceanography Group (ES), The Ocean Cleanup (NL), Egger Research and Consulting (CH), Utrecht University, Faculty of Science, Institute for Marine and Atmospheric Research (NL), Utrecht University, Faculty of Geosciences, Department of Earth Sciences (NL), University of Tromsø, CAGE - Centre for Arctic Gas Hydrate, Environment and Climate (NO). ![]() January 2023, Article in peer-reviewed journalĪnnalisa Delre, Maaike Goudriaan, Victor Hernando Morales, Annika Vaksmaa, Rachel Tintswalo Ndhlovu, Marianne Baas, Edwin Keijzer, Tim de Groot, Emna Zeghal, Matthias Egger, Thomas Rockmann and Helge Niemann GNSS and GPS, Hydrology and bathymetry, Macroplastic transport hotlines, Retention and remobilisation, River estuary, Surface drifters and trackers. ![]() Finally, it is shown that trajectories crossing the riverine-marine continuum at the estuary can be accurately traced to support future investigations on the so far scarcely evidenced river mouth emissions of macroplastic debris. Furthermore, it is outlined that the trajectories can be linked with environmental factors such as bathymetry and tides to more accurately model macroplastic debris behaviour in rivers. On their way through the river and gulf, covering between 9 and 696 km, drifters got stuck up to 23 times, spending 80% of their river lifetime in retention. This study indicates that river macroplastic debris transport ‘hotlines’ (positions where floating debris will likely pass by in a river) as well as retention-remobilisation cycles can be studied at fine scale. ![]() The used grapefruit-sized drifters (n = 5) with minimal drogue (ρ ≈ 0.67 g/cm 3) sent their positions at up to 4 m and 5 min spatiotemporal resolution via cellular GSM network for up to 48 days. Exploring the capacity to investigate fine-scale macroplastic debris-estuary interactions, this study brings together, on the one hand, a small, sensitive, floating satellite drifter with, on the other hand, the major riverine-marine habitat of the Chao Phraya River estuary at Bangkok, Thailand. Though well established in the marine environment, the use of floating satellite drifters to understand macroplastic debris transport in tidal rivers and estuaries is in its infancy. at a pier) and remobilisation is needed to inform global river plastic transport models as well as mechanical cleanup efforts. Data on fine-scale and high-accuracy transport trajectories and cycles of retention (when macroplastics are trapped, e.g. In river plastic pollution research little is known about the detailed pathways and interruptions that occur during the journey of macroplastic debris (>5 cm) from land to sea. Marine and Coastal Resources Research Center (TH) Collaborators: The Ocean Cleanup (NL), Aquatic Resources Research Institute, Chulalongkorn University (TH), Environmental Research Institute, Chulalongkorn University (TH), Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University (TH), Program Management Unit for Human Resources & Institutional Development, Research and Innovation (PMU-B), Office of National Higher Education Science Research and Innovation Policy Council, Ministry of Higher Education, Science, Research and Innovation (TH),.Publication journal: Environmental Pollution.Publication type: Article in peer-reviewed journal.Thomas Mani, Yotwadee Hawangchu, Pummarin Khamdahsag, Jenyuk Lohwacharin, Doungkamon Phihusut, Isara Arsiranant, Chalatip Junchompoo and Ratchanon Piemjaiswang January 2023, article in peer-reviewed journal ![]()
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