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UP: Umweltphysik

UP VII: HV VII

UP VII.1: Invited Talk

Thursday, March 18, 1999, 16:30–17:00, KO

Analysis of solute transport in a heterogeneous aquifer: The Krauthausen field experiment — •Harry Vereecken — Institut für Chemie und Dynamik der Geosphäre, Forschungszentrum Juelich GmbH, D52425 Jülich

Heterogeneity in hydraulic and sorption properties of soils and aquifers play an important role in the transport of solutes. Tracer experiments were conducted in a heterogenous aquifer in Krauthausen, Germany. The plume monitoring was combined with a detailed characterization of the subsurface using classical and geophysical methods. Prediction of the large scale behaviour of solute transport was found to be hampered by the large uncertainty in estimating the statistics of the hydraulic conductivity field. Statistics of the velocity field were determined from local borehole measurements. The calculated variance of the transverse velocity component from first order perturbation theory was found to be considerably smaller than the variance derived from the measured components. Magnitude and direction of measured velocities showed a clear difference between hydrogeological layers in terms of magnitude and flow direction. Velocity measurements could be qualitatively related to aquifer structures determined from resistivity measurements. To determine the spatial and temporal evolution of solutes a new method was developed based on the measurement and inversion of weak magnetic field strengths.