Underground Seepage of Brackish Lake Water into the Reclaimed Land of Nakanoumi, Shimane Prefecture, and Its Effect on the Composition of Inorganic Salts in Soil

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  • 島根県中海干拓地内への汽水性湖水の地下浸透とそれが土壌の無機塩分組成に及ぼす影響について
  • シマネケン ナカウミ カンタク チナイ エ ノ キスイセイ コスイ ノ チカ

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Abstract

The amount of brackish lake water seeping through underground into the reclaimed land of Nakanoumi, Shimane Prefecture, was estimated by surveying the monthly water balance for 3 years from January, 1985, to December, 1987. The estimated amount of monthly seeping water was, on the average, 0.7 Mm^3 (standard deviation, 0.3 Mn^3), changed periodically in parallel with the water level of the lake, and was significantly large in summer. The seeping lake water has caused an increase in the proportion of the sodium and chloride ions, together with a decrease in the proportion of the calcium and sulfate ions, contained in underground water from the upland field soil. The effect of brackish lake water on the soil was remarkable in the circumferential field of the reclaimed land.

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