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A data-driven approach for analyzing dynamics of tide–aquifer interaction in coastal aquifer systems

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Abstract

Analysis of tidal effects on aquifer systems plays an important role in coastal aquifer management owing to various hydrological, engineering and environmental problems in coastal areas. Using the real-world data of unconfined and confined aquifers, a data-driven approach is presented in this study for the analysis of tide–aquifer interaction in coastal aquifers. Six analytical tide–aquifer interaction models were selected which take into account the effects of vertical beach, sloping beach, tidal loading, aquifer leakage, outlet capping, and combined leakage and outlet capping on tide-induced groundwater fluctuations. The tide–aquifer interaction datasets were obtained from the Konan groundwater basin (unconfined aquifer) of Japan and the Dridrate groundwater basin (confined aquifer) of Morocco. The analysis of the results obtained by the sloping beach model revealed that for a given beach slope, the amplitude of groundwater level increases with an increase in aquifer diffusivity and a decrease in aquifer thickness. However, no significant effect of beach slope was observed in this study at unconfined sites for all the datasets. The influence of tidal loading was found to be considerably less for all the three confined sites. Further, the analysis of the results of the leakage model indicated that with an increase in leakage into the aquifer, the amplitude of groundwater level as well as the phase shift (time lag) decreases. Of all the confined and unconfined datasets, only two confined sites were found to be affected by outlet capping. Overall, it is concluded that the coastal beach bordering the Konan basin is not significantly sloping, the contribution of tidal loading to tide-induced groundwater fluctuations in the Dridrate aquifer is not appreciable, and that the aquifer leakage and outlet capping do not exist at the unconfined sites under investigation.

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Acknowledgments

The authors are very grateful to Dr. Y. Fakir of the Department of Geology, Semlalia Faculty of Sciences, Morocco for providing the real-world tide–aquifer interaction data of a coastal confined aquifer. They are also obliged to the two anonymous reviewers and the editor for their helpful comments and suggestions.

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Correspondence to Amanpreet Singh.

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Singh, A., Jha, M.K. A data-driven approach for analyzing dynamics of tide–aquifer interaction in coastal aquifer systems. Environ Earth Sci 65, 1333–1355 (2012). https://doi.org/10.1007/s12665-011-1383-3

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