Relevance of local compound‐specific transverse dispersion for conservative and reactive mixing in heterogeneous porous media

摘要: [1] Different measures of dilution have been proposed to describe solute mixing in heterogeneous porous media. Most these approaches lead the definition effective dispersion coefficients. In order quantify mixing, up-scaled parameters should account for both local-scale and effects flow variability formations (e.g., focusing high-conductivity defocusing low-conductivity inclusions). The correct quantification is particularly important transport compounds undergoing reactions. Recent results multitracer laboratory experiments showed a dependency local transverse on molecular diffusion over wide range velocities, implying compound-specific even at intermediate high Peclet numbers. goal this study assess relevance conservative reactive domains field scale. We restrict our analysis steady state two-dimensional with continuous injection from line source. present numerical simulations different characteristics conductivity field, apply as mixing: (1) coefficient derived second central spatial moments, (2) flux-related (3) scalar dissipation rate, (4) index. indicate behavior also scale which significant case low moderately Moreover, we show that calculated framework result an improved processes allow define (i.e., coefficients) affected by degree uncertainty. For mixing-controlled illustrate importance compound-dependent length plumes.