Abstract
Transport models based on calibrated flow models may often yield wrong predictions unless recalibrated with the aid of environmental tracers because migration velocity depends on the ratio of hydraulic conductivity to porosity whereas flow rates depend on transmissivity. An environmental tracer (SF6) was used to improve calibration of transport and flow models in a sandy aquifer. Simulated and measured 3 H contents showed that further improvement of the conceptual model and recalibration of flow and migration models are needed for some parts of the aquifer. Residence time distributions obtained from lumped-parameter and numerical models are shown to serve for a better understanding of the groundwater system.
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