A5090558211- Groundwater flow and contamination studies
- CO2 Sequestration and Geologic Interactions
- Soil and Unsaturated Flow
- Hydraulic Fracturing and Reservoir Analysis
- Concrete and Cement Materials Research
- Radioactive element chemistry and processing
- Hydrocarbon exploration and reservoir analysis
- Geothermal Energy Systems and Applications
- Nuclear and radioactivity studies
- Clay minerals and soil interactions
- Geological and Geochemical Analysis
- Methane Hydrates and Related Phenomena
- Rock Mechanics and Modeling
- Grouting, Rheology, and Soil Mechanics
- Graphite, nuclear technology, radiation studies
- Drilling and Well Engineering
- Calcium Carbonate Crystallization and Inhibition
- Dam Engineering and Safety
- Geochemistry and Geologic Mapping
- NMR spectroscopy and applications
- Mine drainage and remediation techniques
- Mineral Processing and Grinding
- Innovations in Concrete and Construction Materials
- Concrete Corrosion and Durability
- Groundwater and Isotope Geochemistry
Paul Scherrer Institute
2014-2024
University of Tübingen
2009
Weizmann Institute of Science
1999-2002
Federal Institute for Geosciences and Natural Resources
1999
Diffusion of cations and other contaminants through clays is central interest, because clay rocks are widely considered as barrier materials for waste disposal sites. An intriguing experimental observation has been made in this context: Often, the diffusive flux at trace concentrations much larger retardation smaller than expected based on their sorption coefficients. So-called surface diffusion sorbed invoked to explain observations but remains a controversial issue. Moreover, corresponding...
Abstract Mineral precipitation and dissolution in aqueous solutions has a significant effect on solute transport structural properties of porous media. The understanding the involved physical mechanisms, which cover large range spatial temporal scales, plays key role several geochemical industrial processes. Here, by coupling pore scale reactive simulations with classical nucleation theory, we demonstrate how interplay between homogeneous heterogeneous kinetics along non-linear dependence...
Abstract We examine a set of analytical solutions based on the continuous time random walk (CTRW) approach, which can be evaluated numerically and used to analyze breakthrough data from tracer tests. Practical application these solutions, with discussion physical meaning relevant model parameters, is emphasized. The CTRW theory accounts for often observed non‐Fickian (or scale‐dependent) dispersion behavior that cannot properly quantified by using advection‐dispersion equation. given here,...
We use numerical simulations to examine the variability of flow patterns in representative fracture intersection geometries. In contrast existing studies perfectly orthogonal intersections, we demonstrate that more realistic geometries lead a rich spectrum patterns. Moreover, solutions Navier‐Stokes equations these intersections indicate non‐linear inertial effects become important for Reynolds numbers as low 1–100. Such often exist naturally fractured formations, particularly karst systems...
Geological field observations evidence that active and fossil Icelandic hydrothermal systems are typically embedded into an intercalation of almost completely altered nearly unaltered volcanic rock layers. We investigated the reasons for this finding with help geochemical reaction path calculations, by studying mineralogical evolution contrasting lithofacies–basalt flows hyaloclastites at various temperatures pressures, different recharge water composition, gas content. From study, we...
Abstract Deep subsurface exploration is important for mining, oil and gas industries, as well in the assessment of geological units disposal chemical or nuclear waste, viability geothermal energy systems. Typically, detailed examinations formations are performed on cuttings core materials extracted during drilling campaigns, geophysical borehole data, which provide information about petrophysical properties rocks. Depending volume rock samples analytical program, laboratory analysis...
One of the challenging problems in mathematical geosciences is determination analytical solutions nonlinear partial differential equations describing transport processes porous media. We are interested diffusive coupled with precipitation‐dissolution reactions. Several numerical computer codes that simulate such systems have been developed. Analytical solutions, if they exist, represent an important tool for verification solutions. present a methodology deriving exact and explicit space time...