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This research project mainly is about the effects of reconstruction measures of river banks and bottom at a river section that is the contributing area of abstraction of groundwater via river bank filtration. After the reconstruction, the hydraulic conductivity of the riverbed and river banks seems to have increased going along with a larger infiltration rate from the river to the groundwater system and further changed the groundwater flow field as well as the temperature distribution along the flow path. We have set up a three-dimensional groundwater flow and heat transport model to simulate the change. By comparing two scenarios with/without reconstruction, we could quantify the increase of the infiltration rate of the riverbed and the change of the contribution ratio between infiltrated surface water and genuine groundwater to the pumping wells of the water works. Stable isotope and other water quality data were also included in the research to further characterize the redox zonation of the flow field and further analyse the influence of the hydraulic changes on the groundwater quality.
Hermann Lensing, Daniel Strasser (Bundesanstalt für Wasserbau, Karlsruhe)
Carsten Zühlke (Stadtwerke Potsdam)