Influence of alternative dissolution models and subsurface heterogeneity of DNAPL disappearance times

摘要

The numerical model CompFlowC + + is used to examine the relative importance of different formulations of a forward dissolution rate model, within the range of parameters measured from laboratory and field studies, for predicting the mean and uncertainty in dense nanaqueous phase liquids(DNAPL)dissolution times in heterogeneous sandy aquifers. We also investigate whether uncertainty in the DNAPL distribution due to imprecise knowledge of the form of the nonaqueous phase relative permeability curves and the variance of the heterogeneous permeability field are more important factors affecting the dissolution of a DNAPL source zone than the formulation and parameter values of the forward dissolution rate.