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漂着 ごみ量の測定に必要な海浜ごみの砂浜からの流出による消失半減期 Elimination Half-life Measurement of Beach Litter in Order to Estimate　the Amount of Floating Marine Litter That is Washed Ashore ヒョウチャク　ゴミ　リョウ　ノ　ソクテイ　ニ　ヒツヨウ　ナ　カイヒン　ゴミ　ノ　サキュウ　カラ　ノ　リュウシュツ　ニ　ヨル　ショウシツ　ハンゲンキ 岡野, 多聞 オカノ, タモン 森田, 晃 モリタ, アキラ Okano, Tamon オカノ, タモン Morita, Akira モリタ, アキラ 注があるものを除き、この著作物は日本国著作権法により保護されています。 / This work is protected under Japanese Copyright Law unless otherwise noted. Floating marine litter Elimination half-life Beached PET bottle Washed-up lighter Beach debris Floating marine litter Elimination half-life Beached PET bottle Washed-up lighter Beach debris The amount of marine litter released from each country is reflected in the amount of beached litter originating from each corresponding country. Therefore, the monitoring results are instrumental in improving the measures to prevent the outflow of waste. However, the actual quantity washed ashore minus the quantity of outflow is the change of accumulated quantity on beach. Therefore, we measured the elimination half-life of litter items on eight beaches facing the Sea of Japan, and classified the items the beached quantity of which are possible to be measured. Consequently, it is impossible to measure the beached quantities of debris of polystyrene foam and plastic bags because of their instant transport even by weak wind. The elimination half-life of PET bottles from the beaches is about one month, because some of them contain residues or sand. Therefore the beached quantities of most of plastic bottles are considered possible to be measured by monthly monitoring. Disposable lighters and glass bottles are not affected by wind transport, and their elimination half-lives are around three months. However, it is difficult to measure the beached quantity of plate-like debris thinner than disposable lighters, because they are buried and exposed by blown sand. 鳥取大学大学院工学研究科 2014-12-25 jpn departmental bulletin paper VoR https://repository.lib.tottori-u.ac.jp/records/3146 鳥取大学大学院工学研究科／工学部研究報告. 2014, 45, 95-105 AN00174610 03858596 鳥取大学大学院工学研究科／工学部研究報告 Reports of the Graduate School/Faculty of Engineering, Tottori University 45 95 105 https://repository.lib.tottori-u.ac.jp/record/3146/files/rgsfe45_95.pdf application/pdf 989.5 kB 2015-01-28