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River Countermeasures to Avoid Marine Plastics and Microplastics Pollution
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This Japanese study documents microplastic contamination across 23 rivers, finding that urbanized watersheds carry more microplastics and that flood events are responsible for large episodic pulses of plastic transport toward the ocean — highlighting rivers as a key pathway for terrestrial plastic entering marine environments.
本報では，海洋プラスチックごみやマイクロプラスチックの発生源と考えられる陸域・河川ごみの動態を示すために，多くの現地調査事例に基づいて，河川におけるごみ (川ごみ) の輸送状況やごみ組成を示すとともに，日本の河川におけるマイクロプラスチック汚染状況の実態を取りまとめた。その結果，川ごみは出水時に大量に輸送され，川ごみ全体の 6 %がプラスチック等の人工系ごみであった。マイクロプラスチックに関しては，全 23 河川で発見されたこと，流域の市街化が進んでいる河川のほうがマイクロプラスチック汚染が進んでいることも示された。さらに，海洋プラスチックごみおよびマイクロプラスチック対策としての河川におけるごみ捕捉技術の可能性について言及した。
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