47・7豪雨による西三河山腹崩壊地域の天然水の水質

概要

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An earth flow occurred on 12th to 13th of July, 1972, in more than 3,000 locations in Obara-mura (area: 75km^2), Nishimikawa of Aichi Prefecture. Water samples were taken from the earth flow area and analyzed for Na^+, Ca^<2+>, Mg^<2+>, Cl^-, HCO_3^-, SO4_^<2-> and soluble SiO_2. The concentrations of Ca^<2+>+Mg^<2+> and HCO_3^- were varied greatly from location to location, indicating the difference of the dissolution of Ca^<2+>+Mg^<2+> in waters from clay, sand and rock materials in the different areas. The chemical compositions of the waters indicate that the earth flow occurred only owing to a very heavy rain, and that in some locations a chemical weathering is progressing rather actively to form clay materials under the ground through the interaction of carbonated water with rock materials.
日本地球化学会の論文