大根島淡水レンズの動態観測とトリチウム濃度

書誌事項

タイトル別名
  • Long-term observation of the behavior of the freshwater-lens in Daikonjima lsland and tritium concentration in the groundwater
  • ダイコンジマ タンスイ レンズ ノ ドウタイ カンソク ト トリチウム ノウド

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抄録

The gmundwater in Daikonjima island in Shimane prefecture,southwest Japan were investigated for salinity and temperature using the long-term observation system“CT-sensor”.Tritium concentrations of the groundwater supported the interpretation of the freshwater-lens behavior.Bottom fluctuation of the freshwater-lens was compared with tidal variation in Lake Nakaumi.Tidal effect was recognized in the intermediate zone below the freshwater-lens and above the high saline water.High tritium concentrations in the intermediate zone suggest the advection of new saline water from Lake Nakaumi.

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