Springwater chemistry after rainfall on akiyoshi-dai limestone plateau, western japan
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概要
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Springwater chemistry after rainfall were investigated at Kaerimizu, Yanaginomizu and Dekimizu springs on Akiyoshi-dai limestone plateau, western Japan. The major components, Ca^＜2+＞ and HCO_3^- supplied by the solution of limestone, were strongly correlated, and their concentrations of Yanaginomizu and Dekimizu were higher than those of Kaerimizu. The other dissolved components were highly correlated at Kaerimizu, whereas there were no clear relationships at Yanaginomizu and Dekimizu. These facts indicates that Kaerimizu is recharged from both the subcutaneous and phreatic storage, and has relative large and long flow paths such as conduits (caves and shafts) within catchment area. In contrast, at Yanaginomizu and Dekimizu, it is probable that their water are recharged only from the subcutaneous storage, and are mostly fed through a diffuse flow system and short flow paths. It is therefore clear that the differences of springwater chemistry after rainfall among those springs reflect hydrogeological differences in karst aquifer. Furthermore, high Ca^＜2+＞ concentration and saturation index for respect to calcite at Yanaginomizu and Dekimizu suggest that both springs have the characteristics of subcutaneous flow, which implies the solution of limestone mostly occurs in the epikarstic zone and soil-limestone interface.
- 首都大学東京の論文