日本地球惑星科学連合2015年大会

講演情報

口頭発表

セッション記号 M (領域外・複数領域) » M-AG 応用地球科学

[M-AG38] 福島原発事故により放出された放射性核種の環境動態

2015年5月26日(火) 16:15 〜 18:00 301B (3F)

コンビーナ:*北 和之(茨城大学理学部)、恩田 裕一(筑波大学アイソトープ環境動態研究センター)、中島 映至(東京大学大気海洋研究所)、五十嵐 康人(気象研究所 環境・応用気象研究部)、山田 正俊(弘前大学被ばく医療総合研究所)、竹中 千里(名古屋大学大学院生命農学研究科)、山本 政儀(金沢大学環低レベル放射能実験施設)、篠原 厚(大阪大学理学系研究科)、座長:山田 正俊(弘前大学被ばく医療総合研究所)

17:21 〜 17:24

[MAG38-P11] USLEモデルに基づく放射性セシウム分布および移行量の広域評価

ポスター講演3分口頭発表枠

*中村 典子1恩田 裕一1近藤 昭彦2脇山 義史1 (1.筑波大学 アイソトープ環境動態研究センター、2.千葉大学 環境リモートセンシング研究センター)

キーワード:東日本大震災, 福島原発事故, セシウム137, USLE, 土壌侵食, 放射性物質移行

The radioactive contaminations which flowed out from the Fukushima nuclear power plant first due to the Great East Japan Earthquake are still contained great amounts in the soil around the nuclear power plant, and it causes serious concern over the health of inhabitants. In this study, for the prediction of the migration dynamics of radioactive caesium deposited on the soil around the nuclear power plant, the time-spatial variation of deposition and washoff ratio of 137Cs up to the present was calculated based on the soil erosion rate obtained from the USLE and the initial 137Cs inventory obtained by the airborne monitoring. The parameters needed for calculation of USLE were determined from the observation results obtained from the study sites established in the Fukushima prefecture. The estimation results from the calculation were compared with the measurements of 137Cs washoff ratio obtained from the rivers around the nuclear power plant. As the result, calculated 137Cs washoff rate was approximately underestimate than the measured rate however was consistent qualitatively. And in the view of landuse, in the catchment of Abukuma river, the ratio of washoff from the paddy was large in the early period from the accident, however, as time goes on, the ratio of washoff from the paddy has decreased and the ratio of other landuses has increased.