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Spatial Variability of Microplastics in the Fujisawa Coast and Preliminary Experimental Investigation of Its Removal
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This Japanese study investigated the spatial distribution of microplastics on Fujisawa beach in Kanagawa Prefecture across two seasons and tested a simple removal method. Researchers found an average of 93 microplastic particles per square meter, with distribution influenced by wind patterns and position on the beach. A field experiment demonstrated that over 90% of microplastics could be recovered from sand using a simple collection method.
近年，地球環境問題の1つとしてマイクロプラスチック（以降，MP）への関心が高まっている．このような中，海浜に存在するMPの実態を把握することは，その動態を把握するための重要な項目の1つであるが，同一海浜内のMP分布変動を詳細に検討した調査はまだ少ない．本研究では神奈川県藤沢海岸片瀬西浜地区にて，径0.5～5.0mmの大きさのMPを対象とした空間分布調査を2019年春先と同年秋において実施し，MPの分布変化とその要因について検討を行った．その結果，対象海岸では平均93個/m2のMPが採取され，また，同一海浜内においても海側，中央，陸側によって分布に差があり，MPの移動は風速場により影響を受けやすいことが示唆された．加えて，径0.85～5.0mmのMPを対象とした簡易回収実験を行ったところ，砂に混在した状態から90%以上のMPを回収できることがわかった．
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