A new numerical method of considering local longitudinal dispersion in single fractures
2014 (English)In: International journal for numerical and analytical methods in geomechanics (Print), ISSN 0363-9061, E-ISSN 1096-9853, Vol. 38, no 1, 20-36 p.Article in journal (Refereed) Published
The solutions of advection-dispersion equation in single fractures were carefully reviewed, and their relationships were addressed. The classic solution, which represents the resident or flux concentration within the semi-infinite fractures under constant concentration or flux boundary conditions, respectively, describes the effluent concentration for a finite fracture. In addition, it also predicts the cumulative distribution of solute particle residence time passing through a single fracture under pulse injection condition, based on which a particle tracking approach was developed to simulate the local advection-dispersion in single fractures. We applied the proposed method to investigate the influence of local dispersion in single fractures on the macrodispersion in different fracture systems with relatively high fracture density. The results show that the effects of local dispersion on macrodispersion are dependent on the heterogeneity of fracture system, but generally the local dispersion plays limited roles on marodispersion at least in dense fracture network. This trend was in agreement with the macrodispersion in heterogeneous porous media.
Place, publisher, year, edition, pages
2014. Vol. 38, no 1, 20-36 p.
local dispersion, macrodispersion, single fracture, discrete fracture network, solute transport, particle tracking method
IdentifiersURN: urn:nbn:se:kth:diva-139259DOI: 10.1002/nag.2191ISI: 000328073800002ScopusID: 2-s2.0-84890150698OAI: oai:DiVA.org:kth-139259DiVA: diva2:685407
QC 201401092014-01-092014-01-082014-01-09Bibliographically approved