Research

Code development and numerical simulation of THC/M coupled process 

  • Source code development for reactive transport simulation for the evaluation of contaminant migration and degradation in underground (e.g. nuclear waster final repository)
  • Numerical simulation of dissolution/precipitation processes of host rocks interacting with groundwater
  • Geochemical simulation under extreme thermodynamic conditions
  • Concrete corrosion in highly saline solutions
  • Gas migration in low permeable porous media
  • Noble gas ingrowth and migration
  • Multiphase flow analysis of hydraulic migration processes in low permeable porous media

Computer skills

  • Scientific Software Development and/or Application
    • MIN3P code development, management, quality control since 2012
    • OpenGeoSys - 4 years of C/C++ source code development and application
    • PHREEQC - interface development in OpenGeoSys for reactive transport
    • ChemApp - interface development in OpenGeoSys for reactive transport
    • TOUGH2, TMVOC - code modification and application for multiphase flow
    • TOUGHREACT - primary application for reactive transport in multiphase flow
    • MODFLOW, PEST - working knowledge for groundwater resource evaluation
  • Programming Languages: C/C++, FORTRAN
  • HTML - website development and administration
  • TecPlot, Latex

Engineering barrier material development (HLW)

  • Experiment on heavy metal migration in soil
  • Laboratory experiments (e.g. hydraulic conductivity, diffusion coefficient, gas migration) on highly compacted bentonite as engineering barrier material
  • Development of the self-sealing salt material
  • Geologist,  GRS mbH, Braunschweig, Germany
  • Senior Scientist, INTERA Engineering Ltd., Ottawa, ON, Canada 
  • PostDoc/Scientist, University of Tübingen, Germany
  • PhD Student, Institute of Geology, University of Trier, Trier, Germany

Selected Journal publications:

  1. Implementation and evaluation of permeability-porosity and tortuosity-porosity relationships linked to mineral dissolution-precipitation

M Xie, KU Mayer, F Claret, P Alt-Epping, D Jacques, C Steefel, ...

Computational geosciences 19, 655-671

2. Reactive Transport Modelling of Elevated Dissolved Sulphide Concentrations in Sedimentary Basin Rocks

M Xie, D Su, KTBMQKU Mayer

Geofluids 2023 (https://doi.org/10.1155/2023/7435602)

3. The impact of ice sheet geometry on meltwater ingress and reactive solute transport in sedimentary basins

D Su, M Xie, KU Mayer, KTB MacQuarrie

Water Resources Research 58 (10), e2022WR032353

4. Reactive transport investigations of the long-term geochemical evolution of a multibarrier system including bentonite, low-alkali concrete and host rock

M Xie, D Su, KU Mayer, KTB MacQuarrie

Applied Geochemistry 143

5. Simulation of diffusive solute transport in heterogeneous porous media with dipping anisotropy

D Su, M Xie, KU Mayer, KTB Macquarrie

Frontiers in Water

6. Benchmarking of reactive transport codes for 2D simulations with mineral dissolution–precipitation reactions and feedback on transport parameters

J Poonoosamy, C Wanner, P Alt Epping, JF Águila, J Samper, ...

Computational geosciences 25, 1337-1358

7. Reactive transport modelling in salt material based on Gibbs energy minimization

M Xie, HC Moog, W Wang, HJ Herbert, H Shao, O Kolditz

The Mechanical Behavior of Salt–Understanding of THMC Processes in Salt, 277-284

8. Alteration of expandable clays by reaction with iron while being percolated by high brine solutions

HJ Herbert, J Kasbohm, L Nguyen-Thanh, L Meyer, T Hoang-Minh, M Xie, ...

Applied Clay Science 121, 174-187

9. OpenGeoSys: an open-source initiative for numerical simulation of thermo-hydro-mechanical/chemical (THM/C) processes in porous media

O Kolditz, S Bauer, L Bilke, N Böttcher, JO Delfs, T Fischer, UJ Görke, ...

Environmental Earth Sciences 67, 589-599

10. A geochemical transport model for thermo‐hydro‐chemical (THC) coupled processes with saline water

M Xie, O Kolditz, HC Moog

Water Resources Research 47 (2)

11. Swelling experiments on mudstones

CL Zhang, K Wieczorek, ML Xie

Journal of Rock Mechanics and Geotechnical Engineering 2 (1), 44-51

12. Effect of plastic fragments on hydraulic characteristics of pretreated municipal solid waste

M Xie, D Aldenkortt, JF Wagner, G Rettenberger

Canadian geotechnical journal 43 (12), 1333-1343

13. Numerical simulation of reactive processes in an experiment with partially saturated bentonite

M Xie, S Bauer, O Kolditz, T Nowak, H Shao

Journal of contaminant hydrology 83 (1-2), 122-147

14. An upscaling method and a numerical analysis of swelling/shrinking processes in a compacted bentonite/sand mixture

M Xie, SS Agus, T Schanz, O Kolditz

International journal for numerical and analytical methods in geomechanics, vol. 28(15), p. 1479-1502