Significance of injection modes and heterogeneity on spatial and temporal dispersion of advecting particles in two-dimensional discrete fracture networks
2009 (English)In: Advances in Water Resources, ISSN 0309-1708, E-ISSN 1872-9657, Vol. 32, no 5, 649-658 p.Article in journal (Refereed) Published
We investigate the impact of injection mode (flux and resident injection) and heterogeneity in hydraulic properties on dispersion of advecting particles in two-dimensional discrete fracture network models, using a Monte Carlo method. We find that the injection mode has a significant effect on dispersion: The resident injection mode exhibits anomalous features of transport whereas the flux injection mode tends to Gaussian transport; this observation is easily understood by considering phase diagrams where a limited number of particles entering low velocity fractures greatly increase macrodispersion. In spite of a sizeable portion of negative longitudinal velocities, it is shown that multiple crossings are negligible when quantifying longitudinal macrodispersion. A simple probabilistic expression of particle mass balance is shown to predict well the spatial distribution of advecting particles.
Place, publisher, year, edition, pages
Elsevier B.V. , 2009. Vol. 32, no 5, 649-658 p.
Macrodispersion, Discrete fractured media, Advective transport, Injection mode, Multiple crossing, Anomalous transport, Gaussian transport, Stochastic simulation
Earth and Related Environmental Sciences Oceanography, Hydrology, Water Resources Other Environmental Engineering
IdentifiersURN: urn:nbn:se:kth:diva-11970DOI: 10.1016/j.advwatres.2008.07.010ISI: 000266253900003ScopusID: 2-s2.0-64849101017OAI: oai:DiVA.org:kth-11970DiVA: diva2:291680
QC 201009292010-02-022010-02-022011-03-18Bibliographically approved