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Evaluation of Micro- Nanoplastic Generation Potential in Class a River Basins Considering Population Distribution and Meteorogical Conditions
Summary
Researchers developed a grid-based model to evaluate micro- and nanoplastic generation potential in Class A river basins across Japan, applying degradation models from accelerated aging tests to population distribution, UV radiation, and rainfall data, finding the highest per-area potential in the densely populated Tsurumi River basin.
本研究では，飲料用ボトルキャップを対象に乾燥・湿潤状態各々の促進劣化試験に基づいて作成した劣化モデルを人口分布と気象条件（年間累積紫外線量，年間降水日数）を考慮した高解像度のグリッドベースマップに適用することで，国内1級河川流域内において微細プラスチック（Micro- and nanoplastics: MNP）発生ポテンシャルを評価した．各グリッドのMNP発生ポテンシャルを1級河川流域界毎に集計したところ，流域人口や面積の大きい利根川や淀川の値が大きくなった．一方，流域面積当たりの発生ポテンシャルに着目すると，流域内人口密度の高い鶴見川で極めて高くなることがわかった．また，流域人口当たりの発生ポテンシャルでは，降水量の少ない瀬戸内気候に属する太田川において最も大きいことが判明した．今後は流域内での物理的な外力によるMNPの発生や降雨に伴う表面流出効果を考慮して，MNP発生ポテンシャルを解明していく必要がある．
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