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Time-domain random-walk algorithms for simulating radionuclide transport in fractured porous rock
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik, Vattenvårdsteknik.
2008 (engelsk)Inngår i: Nuclear Technology, ISSN 0029-5450, E-ISSN 1943-7471, Vol. 163, nr 1, s. 129-136Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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 radionuclides 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.

sted, utgiver, år, opplag, sider
2008. Vol. 163, nr 1, s. 129-136
Emneord [en]
radionuclide transport, geological repository, nuclear waste, solute transport, dispersion, networks, media, flow
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-17659ISI: 000257277400014Scopus ID: 2-s2.0-50549097738OAI: oai:DiVA.org:kth-17659DiVA, id: diva2:335703
Merknad
International High-Level Radioactive Waste Management Conference Location: Las Vegas, NV Date: APR 30-MAY 04, 2006Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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