Evaluation of a freshwater lens configuration using a time series analysis of a groundwater level and an electric conductivity in Minami-daito Island, Okinawa Prefecture, Japan

DOI Web Site 8 Citations 11 References
  • YANG Heejun
    Graduate School of Science and Technology, Kumamoto University
  • SHIMADA Jun
    Graduate School of Science and Technology, Kumamoto University
  • MATSUDA Hiroki
    Graduate School of Science and Technology, Kumamoto University
  • KAGABU Makoto
    Graduate School of Science and Technology, Kumamoto University
  • DONG Linyao
    Graduate School of Science and Technology, Kumamoto University

Bibliographic Information

Other Title
  • 島嶼地域における地下水位の時系列解析及び電気伝導度を用いた淡水レンズ形状の評価
  • 島嶼地域における地下水位の時系列解析及び電気伝導度を用いた淡水レンズ形状の評価 : 沖縄県南大東島の例
  • トウショチイキ ニ オケル チカ スイイ ノ ジケイレツ カイセキ オヨビ デンキ デンドウド オ モチイタ タンスイ レンズ ケイジョウ ノ ヒョウカ : オキナワ ケンナン ダイトウジマ ノ レイ
  • －沖縄県南大東島の例－

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A freshwater lens configuration was evaluated by using electrical conductivity data in Minami-daito Island, Japan. Groundwater levels, topographical and geological features were discussed in evaluation process.<BR>5 significant constituents (O1, K1, N2, M2, and S2) were detected in spectral analysis results suggesting that ocean tide has significant effect on the groundwater level. The freshwater lens was confirmed at the western side, and at the northeast side. The thickness of those lenses were 10～13m at the central low land, 5～8m at the western side, and 3～6m at the northeast side. The freshwater lens of western side showed the seasonal change due to the difference of aquifer permeability and distribution of the doline ponds or doline.

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