Estimation of coastal residence time of submarine groundwater discharge using radium progenies
A methodology based on γ-spectrometry measurements of untreated coastal water samples is proposed for the direct estimation of coastal residence time of submarine discharged groundwater. The method was applied to a submarine spring at Stoupa Bay covering all seasons. The estimated residence time exhibited an annual mean of 4.6+/-1.7 d. An additional measurement using the in situ underwater γ-spectrometry technique was performed, in the same site. The in situ method yielded a value of 2.8+/-0.2 d that was found consistent with the corresponding value derived using the developed lab-based method (3.4+/-2.0 d) for the same period.
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