THREE-DIMENSIONAL UNSATURATED GROUND WATER FLOW

THIS PROPOSAL IS TO MODEL THE TRANSPORT OF POLLUTANTS IN UNSATURATED POROUS MEDIA FLOW. THE MODEL TO BE USED WILL BE A THREE-DIMENSIONAL UNSATURATED-SATURATED FLOW MODEL COUPLED WITH A THREE-DIMENSIONAL CONVECTION-DISPERSION EQUATION. THE MODEL WILL BE IMPLEMENTED ON A CDC CYBER 205 SUPERCOMPUTER WHICH HAS THE SIZE AND SPEED NECESSARY TO MAKETHIS APPROACH A REALITY. PHASE I OF THE PROJECT WILL BE TO CONSTRUCT THE MODEL CODE AND TEST ITS FEASIBILITY THROUGH COMPUTATION TIME COMPARISONS. THE CODE WILL BE WRITTEN TO INCLUDE INHOMOGENEITY AND ANISOTROPY OF THE MEDIA, AND FORMULATED SO THAT SOURCE AND SINK TERMS IN THE TRANSPORT EQUATION MAY LATER BE INCLUDED. IF THE EXPECTED TWO ORDERS OF MAGNITUDE INCREASE IN SPEED IS ACHIEVED, THE APPROACH WILL BE ASSUMED FEASIBLE. PHASE II EFFORTS WILL THEN BE DIRECTED AT USING THE MODEL TO CHARACTERIZE PHYSICAL AND CHEMICAL PROCESSES UNIQUE TO TRANSPORT IN UNSATURATED FLOW.