국내 대수층 특성을 반영한 포화대 내 유류오염물질 거동 개념 모델에서수리동역학적 및 반응 입력인자 민감도 평가

Abstract

Sensitivity analysis of hydrodynamic and reaction parameters in conceptual model reflecting aquifer characteristics ofKorea was performed to evaluate the uncertainty in the predicted concentrations. Among the hydrodynamic inputparameters, both hydraulic conductivity (Kx) and hydraulic gradient (I) affected transport behaviors of contaminants, andresulted in same convergence concentrations with continuous injections of contaminant. However, longitudinal dispervisity(αL) affected both transport behaviors and the convergence concentrations of contaminants. Compared to thehydrodynamic parameters, growth kinetic and degradation parameters (μm & Kc) more significantly affected both transportbehaviors and the convergence concentrations of contaminants, indicating those parameters had higher sensitivity indicescausing the uncertainties of model predictions. Considering that the sensitivity indices of both hydrodynamic and reactionparameters were a function of transport distance of groundwater, the parameters with higher sensitivity indices, a priori,need to be investigated using conceptual model reflecting site-specific aquifer characteristics before field investigation. After determining the parameters with higher sensitivity indices, the detail field investigations for the selectedhydrodynamic and reaction parameters were warranted to reduce the uncertainties of model predictions.