大根島淡水レンズの動態観測とトリチウム濃度

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  • 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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Abstract

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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