Prediction and Field Verification of Subsurface‐Water Quality Changes During Artificial Recharge, Lubbock, Texas

Publisher Website
Google Scholar
Abstract
A structure‐imitating numerical model is described that simulates one‐dimensional ion movement with chemical reactions. The reactions include nonlinear ion exchange, dissolution, precipitation and ion complex formation and dissociation. The reactions assume equilibrium conditions and the model accounts for hydrodynamic dispersion. A two‐step computational approach separates the convective and dispersive transport from the chemical reactions. This procedure allows ease in changing grid size, time step size and permits the simple insertion of alternative chemical reactions as subroutines. Chemical parameters for the model were developed in the laboratory using batch experimental techniques. The model, with these experimental parameters, was used to predict solute concentrations exiting from a laboratory column. A field study was also modeled using these same chemical parameters. Verification of the model's predictive capabilities was extablished by comparison between the numerical results of the model and the values from the field experiment.