Abstract:

Aiming at solving the problem of surfactant-enhanced DNAPLs-contaminated aquifer remediation, based upon multiphase flow numerical simulation model in this study, the Latin hypercube sampling(LHS) method used for collecting input-output sample data of the multiphase flow simulation model, to effectively improve the efficiency of random sampling and coverage. According to the input-output sample data sets, multiple regression analysis method was used to build an alternative model, dual response surface model, for the multiphase flow simulation.The study explores new theories and methods for optimization of DNAPLs-contaminated aquifer remediation. This study selected a new set of schemes  to test the accuracy of the alternative model. The relative errors of the results calculated for the alternative model are all less than 10%, which means the DNAPLs-contaminated aquifer simulation model based on the LHS method is much close the simulation model. The alternative model can significantly reduce the huge computational load caused by using simulation model directly and repeatedly during the optimization process.

Key words: dense non-aqueous phase liquids, multiphase flow, numerical simulation, Latin hypercube sampling, alternative model