Time-domain random-walk algorithms for simulating radionuclide transport in fractured porous rock

Scott L. Painter, Vladimir Cvetkovic, Osvaldo Pensado

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Time-domain random-walk (TDRW) algorithms are efficient methods for simulating solute transport along one-dimensional pathways. New extensions of the TDRW algorithm accommodate decay and ingrowth of radio-nuclides in a decay chain and time-dependent transport velocities. Tests using equilibrium sorption and matrix diffusion retention models demonstrate that the extended TDRW algorithm is accurate and computationally efficient. When combined with stochastic simulation of transport properties, the resulting algorithm, Particle on Random Streamline Segment (PORSS), also captures the effects of random spatial variations in transport velocities, including the effects of very broad velocity distributions. When used in combination with discrete fracture network simulations, the PORSS algorithm provides an accurate and practical method for simulating radionuclide transport at the geosphere scale without invoking the advection-dispersion equation.

Original languageEnglish
Pages (from-to)129-136
Number of pages8
JournalNuclear Technology
Volume163
Issue number1
DOIs
StatePublished - Jul 2008
Externally publishedYes

Keywords

  • Geological repository
  • Nuclear waste
  • Radionuclide transport

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