Survey on Microplastics and Macroscopic Floating Garbage in River, Coasts, and Estuary in the Eastern Part of Takamatsu City, Japan

Kanta MAZAKI; Masahide Ishizuka; Shōgo Saito; Syunsuke Uemura; Ayami NISHIOKA; Ayami NISHIOKA; Masatoshi Nakakuni; Kazuhiko Ichimi; Kuninao Tada

doi:10.2208/jscejj.24-16087

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Survey on Microplastics and Macroscopic Floating Garbage in River, Coasts, and Estuary in the Eastern Part of Takamatsu City, Japan

Japanese Journal of JSCE 2025

Kanta MAZAKI, Masahide Ishizuka, Shōgo Saito, Syunsuke Uemura, Ayami NISHIOKA, Ayami NISHIOKA, Masatoshi Nakakuni, Kazuhiko Ichimi, Kuninao Tada

Summary

Researchers surveyed microplastics and macroscopic floating litter in rivers, coasts, and estuaries in eastern Takamatsu City, Japan, finding PE and PP dominated microplastics in both river and coastal environments, and that plastic fragments, bags, and cigarette butts were the most common macro-litter items with distribution influenced by wind and wave conditions.

Study Type Environmental

河川・海岸におけるマイクロプラスチックと海岸・海域におけるマクロプラスチック漂流ごみを対象として，直接採取により，それらの特徴や流出量を調べた．その結果，マイクロプラスチックでは，河川・海岸ともにPEやPPが多くみられた．また，2次粒子のMPsの粒径から元の製品の同定は難しいことが確認された．マクロ漂流ごみでは，大分類のうちプラスチックが最も多く，その内訳では袋類や破片やたばこの吸い殻が多い結果となった．また，風や波が強いと潮目が生じず，ごみの回収量もやや減少することが確認された．さらに，不法投棄や不適切な処分をされて流入したごみは，比較的短期間に海域部へと移動することが賞味期限の結果から示された．

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