Berechnung der Zustroemung und des Transports bei der Probennahme in Grundwassermessstellen

SIGLETIB Hannover: RN 7077(87) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

In-situ Technologien zur Grundwasser- und Altlastensanierung Kurzfassungen

Available from TIB Hannover: RR 8109(3) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany); Ministerium fuer Umwelt und Verkehr des Landes Baden-Wuerttemberg, Stuttgart (Germany). Projekt Wasser Abfall Boden (PWAB)DEGerman

Taetigkeitsbericht. Institut fuer Wasserbau, Universitaet Stuttgart Oktober 1982 - September 1984

SIGLETIB: ZB 4049 (1982/84) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Perspektiven in Wasserforschung und Wasserwirtschaft. Globale und regionale Herausforderungen Vortraege

SIGLEAvailable from TIB Hannover: RN 7077(252) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Numerische Simulation des vertikal-ebenen Stofftransports: Programmdokumentation

TIB Hannover: RN 7077(63) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Comparison of Galerkin-type discretization techniques for two-phase flow in heterogeneous porous media

A comparison of Standard Galerkin, Petrov-Galerkin, and Fully-Upwind Galerkin methods for the simulation of two-phase flow in heterogeneous porous media is presented. On the basis of the coupled pressure-saturation equations a generalized formulation for all three finite element methods is derived and analyzed. For flow in homogeneous media the Petrov-Galerkin method gives excellent results. But this method fails to caputre correctly processes that take place at interfaces when for instance the capillary pressure-saturation relationship after Brooks and Corey is assumed. The Fully-Upwind Galerkin method is superior to the Petrov-Galerkin approach because it is able to give correct results for flow in homogeneous and heterogeneous media for the two models of van Genuchten and Brooks-Corey. The widely used dp_c/dS_w grad S_w formulation which is correct for the homogeneous case cannot be used for heterogeneous media. Instead the straightforward approach of grad p_c in combination with a chord-slope technique must be utilized. (orig.)SIGLEAvailable from TIB Hannover: RR 6943(96/11) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Multiphase flow in heterogeneous porous media: a classical finite element method versus an IMPES-based mixed FE/FV approach

Various discretization methods exist for the numerical simulation of multiphase flow in porous media. In this paper, two methods are introduced and analysed - a Full-Upwind Galerkin method which belongs to the classical finite element methods, and a mixed-hybrid finite element method based on an IMPES approach. Both methods are derived from the governing equations of two-phase flow. Their discretization concepts are compared in detail. Their efficiency is discussed using several examples. (orig.)Available from TIB Hannover: RR 6943(96/19) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Pestizidtransport im Boden - Simulationsmodelle und Feldstudien

TIB Hannover: RN 7077(96) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

An introduction to air-water flows in hydraulics

SIGLETIB: RA 1064 (61) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

CONTRACT: a numerical tool for contaminant transport and chemical transformations

Groundwater pollution control has become a growing challenge to water resources management. In this context groundwater research has to cope with the task of describing the processes influencing the input, spreading and chemical transformations of contaminants in aquifers in a quantitative manner, both as individual and as interactive processes. In this context numerical simulation of groundwater flow, contaminant transport and chemical transformations is of primary importance because it provides the opportunity to integrate such different disciplines as hydromechanics, geology, chemistry and microbiology on a common quantitative basis. It also permits coupling of the results from field measurements to those from classical laboratory experiments for the prediction of field-scale reactive behaviour. Without numerical models the effects of single processes in complex interaction in reactive transport could hardly be distinguished. Therefore numerical simulation is an indispensable tool for present-day groundwater research. As a prerequisite for the application of numerical methods, it must be ensured that the numerical tools used lead to a correct solution of the mathematical problem. Discretization errors leading to numerical diffusion or oscillatory behaviour may lead to erroneous results which may be misinterpreted as effects of chemical or physical processes. Requirements for the stability, the accuracy and the efficiency of the numerical methods are more strict and more difficult to fulfill for reactive transport than for conservative transport. The present report written by Olaf Cirpka serves as an introduction to numerical methods for reactive multicomponent transport. Special emphasis is given to discretization methods for transport, and extensive comparisons of different approaches are presented. The given test cases for reactive transport indicate that conceptual models, such as the macrodispersion model or the two-domain approach, which are commonly used for conservative transport, may lead to incorrect results when applied to the transport of compounds which react with each other. However, the test cases also reveal the differences in qualitative behaviour between reactive transport and reactive systems in fully-mixed batch reactors. (orig.)SIGLEAvailable from TIB Hannover: RA 1064(87)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman