An evaluation of boundary conditions for one-dimensional solute transport: 2. Column experiments

摘要: As the result of a theoretical comparison analytical models for one-dimensional solute transport (Novakowski, this issue), it has been found that to reconcile substantial differences observed between under conditions large dispersion, physical modeling study processes in vicinity boundaries must be undertaken. The is conducted using columns ranging diameter from 76 352 mm and length 300 400 mm. Geological materials either or small coefficient dispersion are employed as packing columns. Reservoirs finite volume located at inlet outlet each column. Using conservative fluorescent tracer, experiments investigate use macroscopic continuity concentration boundaries, flux-averaged transformation boundary value problem. Concentration tracer was determined noninvasively both reservoirs and, some experiments, resident within interior column by excavation. Results different volumes reservoir show model flux accounting only poorly simulates mixing process reservoir. In addition, results which concentrations were concept not supported evidence boundary. Thus, macroscopically discontinuous best Unfortunately, solutions with these identical further distinction cannot Analytical inversion Laplace domain solution also presented.