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  • 金子 泰純, 井伊 博行, 平田 健正, 福島 教之, 江種 伸之, 谷川 寛樹
    水工学論文集
    2001年 45 巻 1009-1014
    発行日: 2001/02/10
    公開日: 2010/06/04
    ジャーナル フリー
    Soluble substances of the Kinokawa-river increased down the stream. Excluding weathering of limestone, soluble substances in the upper stream of the catchment covered with forest were very low and main components were HCO-3, SO2-4, Na+, and Ca2+. Soluble substances in the upper stream of the forest catchment with limestone were high and the main components were Ca2+ and HCO-3 Ca2+ and HCO-3 concentrations increased from the upper stream to the middle stream with forest, but Na+, Cl- and SO2-4 concentrations remained unchanged because of weathering of limestone and feldspar. In the lower stream of the catchment with farm land and housing site, the concentrations of Na+, Cl-, NO-3 and SO2-4 were very high. It was concluded from the relation between land uses and water qualities that Na+ and SO2-4 origin were farmland, and Cl- origin was sewage respectively, and NO-3 was derived from both origins. Isotopic study of oxygen and hydrogen indicated that the river water originated from precipitation and isotopic ratios depended on mainly precipitation altitude.
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