Relation between the depth of saltwater/freshwater interface estimated by Wenne r method and the electric conductivity of groundwater

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  • 短報 電気探査比抵抗法による塩水侵入深の推定値と電気伝導度との対応
  • 電気探査比抵抗法による塩水侵入深の推定値と電気伝導度との対応
  • デンキ タンサヒ テイコウホウ ニ ヨル エンスイ シンニュウシン ノ スイテイチ ト デンキ デンドウド ト ノ タイオウ

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Abstract

It is known that electrical methods for s u rface geophysical survey might be capable to locate saline water in a coastal unconfined aquifer. This is the result of the increase in bulk conductivity with increasing in pore water conductivity. The relation between the depth of saltwater intrusion estimated by electrical method and the electric conductivity (EC) of pore water corresponding to its depth, however, is not verified quantitatively. This study revealed the quantitative relation that the estimated depth by Wenner method corresponds to EC of 3 mS/cm (Cl- = 450 mg/l) of groundwater. Considering that such depth is the upper part of the mixing zone, electrical method will be the powerful measure for monitoring the saltwater intrusion in a wide farming area along the coast.

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