HR: 14:55h
AN: H13K-05    [Abstracts]
TI: A numerical study of transverse dispersion and variable density flow in porous media
AU: * Maghami Nick, H
EM: h.maghami-nick07@imperial.ac.uk
AF: Imperial college london, South Kensington Campus Exhibition Road, london, SW7 2AZ, United Kingdom
AU: Schotting, R J
EM: schottin@geo.uu.nl
AF: Utrecht University, Environmental Hydrogeology Group Faculty of Geosciences Budapestlaan 4, Utrecht, 3584 CD, Netherlands
AU: Gutierrez-Neri, M
EM: gutierrez@geo.uu.nl
AF: Utrecht University, Environmental Hydrogeology Group Faculty of Geosciences Budapestlaan 4, Utrecht, 3584 CD, Netherlands
AU: Johannsen, K
EM: klaus.johannsen@bccs.uib.no
AF: Bergen Center for Computational Science, Hoeyteknologisenteret Thormoehlensgate 55, Bergen, N-5008, Norway
AB: A two-dimensional laboratory-scale model is used to study the nonlinear behavior of density gradients on transverse dispersion. Considering a density-stratified horizontal flow in a heterogeneous porous media, a series of simulations is carried out to examine the effect of the density gradient on macro-scale transverse dispersion. Changing salt concentration significantly affects fluid properties which involves a non-linearity in the modeling the interaction between salt and fresh water. It is concluded that the large-scale transport properties for high density flow deviate significantly from tracer case, due to the spatial variation of permeability, described by statistical parameters, at the local-scale. With respect to the results, the gravity number appears to be the controlling parameter for dispersive flux. In addition, the applicability and the limitations of the nonlinear model of Hassanizadeh and Leijnse (1995) in heterogeneous porous media are investigated.
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: 2007 Fall Meeting