Sök i LIBRIS databas



Sökning: onr:js1f6cnpgt6f485x > Solute Transport in...

Solute Transport in Fractured Rocks [Elektronisk resurs] The Effect of Stagnant Water Zones and Velocity Dispersion

Shahkarami, Pirouz, 1986- (författare)
Liu, Longcheng (preses)
Neretnieks, Ivars (preses)
Moreno, Luis (preses)
Kröhn, Klaus-Peter (opponent)
Division of Nuclear Waste Engineering (medarbetare)
KTH Skolan för kemivetenskap (CHE) (utgivare)
Publicerad: KTH Royal Institute of Technology, 2017
Serie: TRITA-CHE-Report, 1654-1081 1654-1081
Läs hela texten
Läs hela texten
  • E-bokAvhandling(Diss. (sammanfattning) Stockholm : Kungliga Tekniska högskolan, 2017)
Sammanfattning Ämnesord
  • The focus of this thesis is on the development of new models to improve our understanding of radionuclide transport in the repository “far-field” in fractured rocks. The proposed models contribute to the channel network concept and describe the recently developed models with stagnant water zones (STWZs) and channels with variable aperture allowing to consider their possible impacts on the overall transport of radionuclides in fractured rocks. New conceptual models are also proposed to better understand hydrodynamic dispersion in fractured rocks by taking into account velocity distribution within tapered channels, i.e., Fickian-type dispersion, and between different flow paths, i.e., velocity dispersion, as embodied in the proposed multi-channel model. The results of both deterministic and probabilistic analyses reveal that over the long times of interest for safety assessment of high-level radioactive waste repositories, STWZs can substantially enhance the retardation of both short- and long-lived nuclides, with the exception of the non-sorbing species, i.e., 36 Cl and 129 I. Nevertheless, over the short time-scales the impact of STWZs is not very strong and is not expected to affect the results of short-term field experiments. It is also shown that the proposed multi-channel model can explain the apparent scale dependency of the dispersion coefficient that is often observed in tracer experiments. It is further discussed that the interpreted results of short-range tracer experiments cannot necessarily give information on what would take place over longer distances because the spreading mechanisms are expected to be entirely different. Usefulness of the continuum model to interpret tracer experiments is, thereafter, discussed and arguments are presented to support the premise that it is more physically meaningful to describe flow and transport as taking place in a three-dimensional network of channels. 


Engineering and Technology  (hsv)
Chemical Engineering  (hsv)
Teknik och teknologier  (hsv)
Kemiteknik  (hsv)
Chemical Engineering  (kth)
Kemiteknik  (kth)


Indexterm och SAB-rubrik

Channel network concept; radionuclide transport; stagnant water zones; velocity dispersion; modeling and simulation
Inställningar Hjälp

Uppgift om bibliotek saknas i LIBRIS

Kontakta ditt bibliotek, eller sök utanför LIBRIS. Se högermenyn.

Fel i posten?
Teknik och format
Sök utifrån
LIBRIS söktjänster

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

Copyright © LIBRIS - Nationella bibliotekssystem

pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy