This paper investigates numerically characteristics of the fluid flow and solute
transport in variable-aperture fractures under effective normal stress conditions. In
order to represent a nonlinear relationship between the supported effective normal
stress and the fracture aperture, a simple mechanical model is combined with a local
flow model. The solute transport is simulated by using the random walk particle
following algorithm. Obtained numerical results indicate that the flow and transport
are significantly affected by the geometry of aperture distribution varying according
to the applied effective normal stress (sn). The spatial correlation length also has
influence on the flow and transport at higher values of sn . The most efficient path
for the flow does not remain the same with sn . However, the path keeps almost the same
form at higher values of sn . The particles displace only along channels reduced by
contact areas increasing with s n and their spatial dispersion thus becomes constant.