The Suitability and Usage of 18O and Chloride as Natural Tracers for Bank Filtrate at the Middle River Elbe |
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| Authors: | R Trettin T Grischek G Strauch G Malleean W Nestler |
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| Institution: | 1. Dept. of Hydrogeology , UFZ Centre for Environmental Research Leipzig-Halle , Theodor-Lieser-Str. 4, 06120, Halle, Germany;2. Institute for Water Chemistry, Dresden University of Technology , 01062, Dresden, Germany;3. College of Science and Technics, Dresden , Friedrich-List-Pl. 1, 01069, Dresden, Germany |
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| Abstract: | Abstract Flow times and infiltration behaviour are very important for water extraction from riverbank filtration. Both the chloride content and the isotopic composition of oxygen (δ18O) were found to be suitable indicators for the conditions encountered in the middle course of the River Elbe near Torgau. The ranges for Elbe water were measured to be 20–43 mg Cl/l (1995-97) and -11 to -8.5‰ δ18O (1993-97). Both methods permitted flow-time spectra at two adjacent sampling profiles incorporating river and production wells to be obtained, indicating the preferred flow paths and the vertical extension of the riverbank filtrate plume in the aquifer. However, since the differences between the mean values for river water and regional groundwater were too small the percentage of river water abstracted from production wells could not be calculated. |
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| Keywords: | Chloride groundwater natural tracers oxygen 18 riverbank filtration River Elbe |
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