Browsing by Author "Schäfer, Gerhard"

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    Dispersive Transportprozesse und ihre Modellierung
    (1992) Kobus, Helmut; Schäfer, Gerhard; Spitz, Karlheinz; Herr, Michael
    Die Anwendbarkeit numerischer Transportmodelle in der Grundwasserwirtschaft ist eingeschränkt durch die Schwierigkeit, den dispersiven Charakter der Grundwasserströmung naturnah zu beschreiben. Dies liegt im wesentlichen an der Heterogenität des Untergrunds. Ziel der hier dargestellten systematischen Untersuchungen an inhomogenen Modellaquiferen war es daher, den Einfluß von Inhomogenitäten auf die dispersive Vermischung quantitativ zu erfassen.
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    Field, theoretical and numerical studies of dispersion : Berichtszeitraum: August bis Oktober 1988
    (1988) Moltyaner, Gregory; Kobus, Helmut; Teutsch, Georg; Kaleris, Vassilios; Schäfer, Gerhard
    A cooperative effort between the University of Stuttgart has developed an expertise in computational aspects of transport in geologic media and in the performance of large-scale laboratory tracer experiments and Chalk River Nuclear Laboratories, Ontario that has broad experience in the performance, analysis and interpretation of field tracer tests on a variety of scales. The proposed investigations respond to the current needs on resolving major scientific hypotheses required to advance the understanding and predictive modelling of contaminant transport in natural geologic environments. This concerns the migration of chemically inert tracers in geologic media, physical and numerical modelling of transport and theoretical aspects of migration.
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    Mass transport in an artificial heterogeneous aquifer : experiments and numerical modelling
    (1989) Schäfer, Gerhard; Kobus, Helmut
    In order to generate a data base for the numerical study of dispersion processes in a well defined heterogeneous porous medium, a laboratory tank of 14 m in length, 0,5 m in height and 0.13 m in width has been constructed, which is composed of 81 different elements of exactly known geometry and hydraulic properties. In dispersion experiments using salt as tracer, breakthrough curves are observed at 80 points in 8 vertical sections. A comparison of three types of numerical models with the experimental data shows how well the models of various complexity describe the advection and dispersion processes and how in these cases the various dispersion parameters depend upon the models used.