日本水文科学会誌
Online ISSN : 1883-7166
Print ISSN : 1342-9612
ISSN-L : 1342-9612
32 巻 , 4 号
選択された号の論文の2件中1~2を表示しています
研究ノート
  • 中村 太郎, 佐藤 努, 安原 正也
    2002 年 32 巻 4 号 p. 135-147
    発行日: 2002年
    公開日: 2019/01/07
    ジャーナル フリー

    In this study, we estimated the mean recharge altitudes of springs and hot springs on the southeast slope of Mt. Ontake, Japan. Water samples were collected from precipitation, springs, hot springs and ponds, and were analyzed on the oxygen and hydrogen stable isotopic ratios. The altitude effects of the precipitation of δD and δ18O were calculated at-0.95 ‰/100 m and -0.14 ‰/100 m, respectively. The altitude effects of springs of δD and δ18O were calculated at -0.97 ‰/100 m and -0.13 ‰/100 m, respectively. Considering that these results were consistent, it was concluded that the ratio of evaporation to precipitations didn’t change from the base to the top of the southeast slope. The estimated ratio of evaporation to precipitation was about 10 % under condition of annual mean temperature. Using the recharge-water line, mean recharge altitudes of springs and hot springs were estimated. Each mean recharge altitude of the three springs is estimated nearby its discharge altitude. By contrast, each mean recharge altitude of hot springs is higher than its screen altitude.

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