Study on the inverse method to permeability coefficient of groundwater system: A case study of uranium gangue site in Southern China

Based on the genetic algorithm (GA) and finite element model for simulating groundwater flow, the inverse modeling for permeability coefficient (PC) of groundwater system in uranium gangue site was discussed, and the result of a case to PC of the uranium gangue site in Southern China was presented. This method could express the characteristic of PC in the research field. Comparing with traditional grads optimization methods, GA has no many deficiencies, which include scan velocity slow as series form along with the coefficients increased, getting into local extremum point easily and errors transfer leading to non-convergence and so on. Moreover its convergence speed was satisfying. So it could be employed to optimize coefficients of modeling for heavy metal contamination transfer in uranium gangue site and simulation.