ABSTRACT
The random walk mass transport model described herein is based on the RANDOM WALK model developed by T. A. Prickett, et al. The random walk model is approximate because of the general roughness of calculated concentration distributions in time and space due to statistical fluctuations. A FORTRAN random walk model program simulating two-dimensional contaminant migration is listed by T. A. Prickett, et, al. and Walton. BASIC random walk model programs simulating two-dimensional contaminant migration are listed by Walton, Kinzelbach, and Bear and Verruijt. Although the random walk model is simple in principle, the programming effort is large because of the extensive book-keeping system required to keep track of particle positions. In the random walk model, particles are injected as a slug at the start of a time increment to simulate aquifer or aquifer layer initial contaminant conditions, otherwise, zero initial contamination is assumed.
