tud
Modelling reactive transport processes in porous media
2010-10-22
[Electronic ed.]
4519974-7
Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden
prv
Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, Dresden
Fakultät Forst-, Geo- und Hydrowissenschaften
Angewandte Umweltsystemanalyse
Umweltinformatics
male
Shanghai
Reactive transport modelling has wide applications in geosciences. In the field of hydrogeology, it has been utilised to simulate the biogeochemical processes that disperse and degrade contaminants in the aquifer. For geotechnical applications, such as geological CO2 sequestration, the reaction of CO2 with the ambient saline aquifer determines the final success of storage. In a radioactive waste repository, scientists rely on reactive transport models to predict the mobilisation of hazardous radionuclides within space and time.
In this work, the multi-component mass transport code OpenGeoSys, was coupled with two geochemical solvers, the Gibbs Energy Minimization Selektor (GEM) and the Biogeochemical Reaction Network Simulator (BRNS). Both coupled codes were verified against analytical solutions and simulation results from other numerical models. Moreover, the coupling interface was developed for parallel simulation. Test runs showed that the speed-up of reaction part had a very good linearity with number of nodes in the mesh. However, for three dimensional problems with complex geochemical reactions, the model performance was dominated by solving transport equations of mobile chemical components.
OpenGeoSys-BRNS was applied to a two dimensional groundwater remediation problem. Its calculated concentration profiles fitted very well with analytical solutions and numerical results from TBC. The model revealed that natural attenuation of groundwater contaminants is mainly controlled by the mixing of carbon source and electron donor. OpenGeoSys-GEM was employed to investigate the retardation mechanism of radionuclides in the near field of a nuclear waste repository. Radium profiles in an idealised bentonite column was modelled with varying clay/water ratios. When clay content is limited, Ba-Sr-Ra sulfate solid solutions have a very strong retardation effect on the aqueous radium. Nevertheless, when clay mineral is abundant, cation exchange sites also attract Sr and Ba, thus dominates the transport of Ra.
550
AR 12450
reaktiver Transport, numerische Simulation, solide Lösungen, Endlager für radioaktive Abfälle
reactive transport, numerical simulation, solid solutions, radioactive waste repository
urn:nbn:de:bsz:14-qucosa-61738
332450457
Technische Universität Dresden
dgg
Technische Universität Dresden, Dresden
UFZ - Helmholtz-Zentrum für Umweltforschung
oth
UFZ - Helmholtz-Zentrum für Umweltforschung, Leipzig
Haibing
Shao
1983-07-20
aut
Olaf
Kolditz
Prof. Dr.-Ing.
dgs
rev
Georg
Kosakowski
PD. Dr.
dgs
Sebastian
Bauer
Prof. Dr.
rev
eng
2010-03-06
2010-09-07
born digital
Haibing Shao
0049 341 235 1884
haibing.shao@ufz.de
doctoral_thesis