Modeling contaminant transport in groundwater: an optimized finite element method

摘要

An optimized upwind Taylor-Galerkin finite element method (UTGFEM) has been developed to simulate one-dimensional contaminant transport in groundwater. The model was employed to predict the transport of contaminants from continuous, pulse, and exponentially decaying sources for a wide range of dispersion coefficients and degradation rate constants. The dispersion coefficients considered were 0.0, 1.0, and 5.0 m2/day. The degradation rate constant was varied between 0.007 and 0.028 (day)−1. The model was found to predict the transport dynamics for all these conditions accurately when the dispersion coefficient was greater than or equal to 0.215 m2/day. The model would introduce some numerical dispersion if the field dispersion were smaller than this limiting value. The need for numerical dispersion can be reduced significantly by making the length of the finite elements smaller.