Forschungszentrum Karlsruhe - Wissenschaftliche Berichte - FZKA 6721
TRePro
2002 - Modelling of Coupled Transport Reaction Processes. Workshop of the
Forschungszentrum Karlsruhe held at 20th and 21st of March 2002
V.
Metz, W. Pfingsten, J. Lützenkirchen, W. Schüßler
Preface
A
wide variety of geochemical processes including the migration of radiotoxic and
chemotoxic materials are intimately related to reactive transport processes.
The relevant rock-water systems can be regarded as open geochemical reactors
where chemical changes occur via the transient interactions between the
aqueous, solid and gas phases. The evolution of these open systems is affected
by diverse processes including fluid flow, transport of solutes and colloids,
and chemical
reactions.
Reactive
transport codes may be used to simulate the chemical interactions and the
transient migration of relevant species in one-, two- or even three-dimensional
spatial configurations. The ability to model reactive transport in natural
systems and the near- and far-fields of waste repositories has advanced
considerably over the past decade. Numerous comprehensive reactive transport
codes have been developed and applied. However, all modelling approaches
implicitely apply certain simplifications. At the present stage of process
understanding and the state of computational capabilities, it is still
impossible to predict the evolution of a natural system or a repository.
Nevertheless, reactive transport modelling may provide insight into some of the
relevant phenomena.
TRePro 2002
deals with “Modelling of Coupled Transport Reaction Processes”. The field of
reactive transport involves a number of diverse scientific disciplines, such as
those related to advective, convective, dispersive and diffusive transport of
solutes and colloids, and interactions among aqueous species, redox reactions,
dissolution/precipitation, surface complexation and ion exchange, as well as
radioactive decay and biochemical reactions, and those scientific disciplines
related to the required numerical aspects of the modelling.
The workshop
focuses on the following major topics:
. Coupling of sorption processes
and transport
. Coupling of redox processes and
transport
. Coupling of dissolution /
precipitation processes and transport
. Influence of colloids on
transport phenomena
Coupled
transport reaction modelling may become one of the cornerstones to evaluate the
performance of a geological repository for radiotoxic and chemotoxic wastes.
Therefore, the challenge of involving coupled transport reaction processes in
the frame of performance assessment is included in TRePro 2002. Indeed, it is
one of the objectives of the workshop to learn to what extent this may be done
at present. The workshop is an attempt to bring together researchers from the
disciplines
mentioned
above, experimentalists and modellers, for stimulating discussion on the latest
developments in modeling of coupled transport reaction processes and their
relevance to performance assessment.
TRePro 2002
is the third meeting in the series of the Karlsruhe Geochemical Workshops. The
first workshop was held in 1997 at the Forschungszentrum Karlsruhe. Its main
topic was “Geochemical Modelling - Radio Toxic and Chemical Toxic Substances in
Natural Aquatic Systems”. The second workshop was held in 1999 in Speyer
focusing on “Mineral / Water Interactions Close to Equilibrium”. The
present workshop was jointly organized by Institut für Nukleare Entsorgung,
Forschungszentrum Karlsruhe (FZK-INE) and Labor für Endlagersicherheit, Paul
Scherrer Institut (PSI-LES). This
book of abstracts contains the contributions presented at TRePro 2002 held at
the Forschungszentrum Karlsruhe, March 20-21, 2002.
VOLLTEXT
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