Water quality classification and vertical distribution of hot springs using hydrochemical methods and multivariate analysis at the Beppu hydrothermal area, Japan

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  • YANG Heejun
    京都大学大学院理学研究科附属地球熱学研究施設

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  • 水文化学的手法と多変量解析による別府温泉の泉質の分類および鉛直分布特性
  • スイモン カガクテキ シュホウ ト タヘンリョウ カイセキ ニ ヨル ベップ オンセン ノ センシツ ノ ブンルイ オヨビ エンチョク ブンプ トクセイ

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Abstract

<p>To evaluate changes in hot spring water quality and estimate the flow paths from its vertical distribution, multivariate analysis (Hierarchical cluster analysis and Factor analysis) and hydrological analysis were conducted using 52 hot spring wells in the Beppu hydrothermal area, Japan. Hot spring water quality was classified by five groups (G1, G2a, G2b, G2c, and G3). G1 and G2a are distributed in the Kamegawa thermal zone, and G3 and G2c are mainly found in the Beppu thermal zone. G2b is observed in both thermal zones. The water types of the hot springs were almost consistent with those in the 1980s but changed from Cl to HCO3 type in the Beppu thermal zone. The vertical distribution of the hot springs implies that there are two distinct flow paths in the Beppu thermal zone, and confirmed the seawater mixing in the well located near the shore. The mixing rate between the seawater and hot spring water was calculated by Cl－ concentration, which was 12% of seawater.</p>

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