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The oceanic tides have an effect on groundwater levels m coastal frachired rock aquifers The observed groundwater table fluctuations caused by the effective stress through an aquifer are shown as sine...
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The oceanic tides have an effect on groundwater levels m coastal frachired rock aquifers The observed groundwater table fluctuations caused by the effective stress through an aquifer are shown as sine curves similar With tidal fluctuation To estimate a hydrogeologic parameter, tidal method IS utilized With groundwater level fluctuations of two momtoring wells
Cross coitelahon function IS used to calculate time lags between observed groundwater levels and tide, and the deeper well shows longer time lag. The storage coefficients calculated by using tidal efficiency and time lag show large differences The storage coefficients obtained by using time lags are close to the result of slug test, and that of the deepel well shows closer value by slug test The tIdal effiCiency is uosatIsfied to apply m the tidal method because of an effect of phreatic aquifer and the vertical flow of groundwater through fractured coufioing bed. This tidal method can be an economical and effective way to define the parameter by considering the location of observation well and hydrogeologic charactenstics of a coastal aquifer
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