Selective transport of microplastics and mesoplastics by drifting in coastal waters

Atsuhiko Isobe, Kenta Kubo, Yuka Tamura, Shin'ichio Kako, Etsuko Nakashima, Naoki Fujii

    Research output: Contribution to journalArticlepeer-review

    304 Citations (Scopus)


    The quantity and size distributions of small plastic fragments in the Seto Inland Sea, Japan were investigated using field surveys and a numerical particle-tracking model. The model was used to interpret the distributions of small plastic fragments and the possible transport processes in coastal waters. Of note, the size and quantity of mesoplastics (approximately > 5. mm) gradually increased close to the coast irrespective of the existence of river mouths, which probably act as a major source of anthropogenic marine debris. Additionally, microplastics were more dominant as we moved further offshore. The numerical model reproduced the near-shore trapping of mesoplastics, suggesting that mesoplastics are selectively conveyed onshore by a combination of Stokes drift and terminal velocity, dependent on fragment sizes. It is suggested that mesoplastics washed ashore on beaches degrade into microplastics, and that the microplastics, which are free from near-shore trapping, are thereafter spread offshore in coastal waters.

    Original languageEnglish
    Pages (from-to)324-330
    Number of pages7
    JournalMarine Pollution Bulletin
    Issue number1-2
    Publication statusPublished - Dec 15 2014

    All Science Journal Classification (ASJC) codes

    • Oceanography
    • Aquatic Science
    • Pollution


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