Numerical models of in situ diffusion experiments in clay formations

• Autores: Qingchun Yang
• Directores de la Tesis: Javier Samper (dir. tes.)
• Lectura: En la Universidade da Coruña ( España ) en 2009
• Idioma: inglés
• Tribunal Calificador de la Tesis: Josep Maria Soler Matamala (presid.), Luís Montenegro (secret.), Carlos Ayora Ibáñez (voc.), Jorge Molinero (voc.), Miguel García Gutiérrez (voc.)
• Calificación: Sobresaliente
• Materias:
  • Ciencias de la tierra y del espacio
    • Geología
      • Hidrogeología
    • Hidrología
      • Calidad de las aguas
  • Ciencias tecnológicas
    • Tecnología nuclear
      • Aplicaciones de isótopos
    • Tecnología del carbón y del petróleo
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• Resumen

  • This dissertation presents numerical models for in situ and lab diffusion experiments involved in the migration of radionuclides in the near and far fields of a deep geological repository for high level radioactive waste in clay. Numerical models have been performed for: 1) The design and interpretation of a long-term, natural-scale in situ diffusion (DR) experiment performed in a packed section into a borehole drilled vertically in the Opalinus Clay at Mont Terri in underground research laboratory in Switzerland; 2) Scoping calculations and interpretation of a mock-up lab experiment in bentonite-granite interface; 3) The interpretation of large-scale solid source diffusion experiments in Callovo-Oxfordian clay at Bure site (France); and 4) The estimation of transport and retention parameters for DIR (Diffusion of Inert and Reactive tracers) in situ diffusion experiments performed on Callovo-Oxfordian clay at Bure. A method to identify which parameters can be estimated and a method to study parameter identifiability of sorption and diffusion parameters are proposed.