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Numerical Analysis on Marine Microplastic Transport in Hiroshima Bay Using a Roms-based Lagrangian Particle Tracking Model
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This Japanese study used a high-resolution 3D ocean circulation model combined with Lagrangian particle tracking to analyze microplastic transport dynamics in Hiroshima Bay. Results showed that estuarine circulation patterns, seasonal river flow, and sea surface cooling controlled microplastic distribution and accumulation hotspots.
閉鎖性海域である広島湾における海洋マイクロプラスチック（MP）の輸送特性について，高解像度3次元瀬戸内海流動モデルとLagrange粒子追跡計算を用いた詳細な数値解析を行った．広島湾内のMP輸送は，湾西海岸に沿う南下流，周防大島東側の湾口での流出，湾奥多島海域での停滞などによって特徴付けられた．これらの輸送は反時計回りのエスチャリ循環と，傾圧不安定による混合層の強化・縮退の影響でよく説明され，河川流量や海面冷却効果に伴って明確な季節差が生じていた．さらにMPの発生源と漂着地の関係性について，MP粒子の統計的な漂着強さを示すdestination strengthと現地調査結果との比較を通じて考察した．
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Researchers used the Regional Ocean Modeling System combined with the LTRANS Lagrangian transport model to simulate seasonal microplastic transport throughout the China Seas, finding that circulation patterns, river discharge, and particle properties drive marked seasonal variations in microplastic pathways and spatial distribution.
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