A new tracer‐density criterion for heterogeneous porous media

Abstract

sinking. Evaluation of the modified criterion using the experiments and field tests demonstrates that the new criterion appears to account for the change in density-induced sinking due to heterogeneity. The criterion demonstrates the importance of accounting for heterogeneity to predict density-induced sinking and differences in the onset of densityinduced sinking in two-and three-dimensional systems.

Viscous and gravitational contributions to mixing during vertical brine transport in water‐saturated porous media

“…Herbert et al [1988] describes one such numerical model that incorporated fluid density dependence on salt concentration, a constant viscosity, and either constant dispersion coefficients or constant dispersivities for the medium. In contrast, Gelhar [1991, 1992] recognize that fluid density and viscosity are variables that determine the macroscopic dispersion in their simulation of a heterogeneous porous medium and this is expanded upon by Barth et al [2001]. Kolditz et al [1998] provides an updated summary of the numerous numerical models available for simulating variable density groundwater flows.…”

“…Seawater intrusion into coastal aquifers is a long-standing problem, and dense fluids dominate groundwater flow near salt domes and beneath leaking municipal landfills [Frind, 1982;Oostrom et al, 1992;Hassanizadeh and Leijnse, 1995;Zhang and Schwartz, 1995;Jiao and Hötzl, 2004]. Predictive models for contaminant transport in natural aquifers have greatly benefited from natural gradient tracer experiments, but there is recognition that plume transport is altered by tracer solutions having density contrasts with the ambient groundwater [Istok and Humphrey, 1995;Barth et al, 2001]. Miscible transport processes in fluid-saturated porous media have direct bearing on the movement and recovery of brines and in determining the fate of contaminants present within brines.…”

Natural and Enhanced Attenuation of Chlorinated Solvents Using RT3D

“…Advection can also be influenced by density differences induced by high concentrations of solutes in the groundwater [Russell et al, 1992;Barth et al, 2001;Wood et al, 2004;Simmons, 2005]. For typical MNA scenarios, density differences imposed by disperse dissolved contaminant concentrations are not significant.…”

Developing an Mna Modeling Tool Based on Rt3d: 3 Reports

“…Advection can also be influenced by density differences induced by high concentrations of solutes in the groundwater [Russell et al, 1992;Barth et al, 2001;Wood et al, 2004;Simmons, 2005]. For typical MNA scenarios, density differences imposed by disperse dissolved contaminant concentrations are not significant.…”