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Scheme for riverine input of toxic trace elements at different flow stages in a rainfall event

降水時の異なる増水段階における微量有害元素の河川流入機構

松永 武; 柳瀬 信之; Kritsananuwat, R.*; 都築 克紀; 半澤 有希子; 長縄 弘親

Matsunaga, Takeshi; Yanase, Nobuyuki; Kritsananuwat, R.*; Tsuzuki, Katsunori; Hanzawa, Yukiko; Naganawa, Hirochika

日本の森林集水域において、降水時における微量有害元素(Cr, Zn, Ni, Cu, Pb, As, Sb, 希土類)の河川流入機構を研究した。微量有害元素が濃集した懸濁粒子の流入は増水段階に応じた粒子の特質の変化とともに起こることが見いだされた。それらの有害元素が濃集した懸濁粒子は、最高増水期間並びに初期降雨時に河川水中でそれらの元素の溶存成分の増加につながることが示唆された。土壌表層からの溶存有機炭素は溶存希土類元素の河川流入を増水後期に促している可能性を見いだした。

The input of toxic trace elements to river water in a rainfall event was studied in a forested watershed in Japan. The riverine input of particulate trace elements varied with their different enrichment in suspended particles at low and high flow stages. This input was suspected to cause an increase in the levels of their dissolved components earlier in the rainfall and at a high flow stage. We also found that dissolved organic carbon from a soillayer can carry rare earth elements to a stream at a latter stage of high flow rate.

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