Spatial distribution of anthropogenic inputs into groundwater: a case study | Verteilung anthropogen eingetragener Stoffe im Grundwasser: Ein Fallbeispiel aus der Nordschweiz
2018
Moeck, Christian | Radny, Dirk | Huggenberger, Peter | Affolter, Annette | Auckenthaler, Adrian | Hollender, Juliane | Berg, Michael | Schirmer, Mario
At the Hardwald study site, Switzerland, 15 million cubic metres per year of drinking water is being pumped. Chlorinated compounds, however, have been detected in the groundwater. We present results from field sampling and lab analyses to determine the spatial distribution of chlorinated organic compounds, stable water isotopes (δ¹⁸O und δ²D), major ions as well as selected micropollutants, which enter the groundwater by artificial recharge. We demonstrate that artificial groundwater recharge is essential for water security and that the pumped groundwater has a close chemical signature to that of the recharged river water. However, due to the heterogeneous infiltration, Muschelkalk water from the regional flow system is mixed with the recently infiltrated water in the south-west.This interpretation is based on the spatial distribution of chlorinated organic compounds, stable water isotopes, major ions as well as selected micropollutants. Despite the complex boundary conditions, the interaction between artificial recharge and pumping provides a secure drinking water supply.
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