日本地球惑星科学連合2018年大会

講演情報

[JJ] ポスター発表

セッション記号 H (地球人間圏科学) » H-TT 計測技術・研究手法

[H-TT18] 環境トレーサビリティー手法の開発と適用

2018年5月22日(火) 15:30 〜 17:00 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:陀安 一郎(総合地球環境学研究所)、中野 孝教(大学共同利用機関法人 人間文化研究機構 総合地球環境学研究所)、木庭 啓介(京都大学生態学研究センター)

[HTT18-P05] Spatial distribution of sediment loading into the Lake Biwa after typhoon 18 (Man-yi) in September, 2013

*名取 幸花1板井 啓明2 (1.お茶の水女子大学、2.東京大学大学院理学系研究科)

キーワード:琵琶湖、洪水、堆積速度

The typhoon 18 (Man-yi) in September 16, 2013 brought the highest 24 hours rainfall ever reported in the western part of the Lake Biwa. This event likely induces massive deposition of terrigeneous matters to the lake. Here we show the spatial distribution of sediment loading after the event using 23 core samples collected in 15 and 18-October, 2013. Particle size distribution, sediment color, and trace element profile were used to identify the newly deposited layer. The results indicated that highest sediment loading was observed near the mouth of Ado-river in which ca. 3 cm of fresh detritus was newly deposited. This amount corresponds ca. 30 years considering general deposition rate in this area. This result can be utilized as the base-data to assess the material input during this event, e.g., nutrient and metals, which affects changing in eco-system in the lake.