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Application of the Convection‐Dispersion Model to Solute Transport in Finite Soil Columns
Author(s) -
Barry D. A.,
Sposito Garrison
Publication year - 1988
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1988.03615995005200010001x
Subject(s) - inlet , dispersion (optics) , boundary (topology) , convection , flux (metallurgy) , mechanics , boundary value problem , tracer , mass flux , constant (computer programming) , hydrology (agriculture) , physics , chemistry , geology , mathematics , geotechnical engineering , mathematical analysis , geomorphology , computer science , organic chemistry , nuclear physics , optics , programming language
The one‐dimensional convection‐dispersion model is investigated with respect to the proper boundary conditions to impose in applications to tracer movement in freely draining soil columns. It is shown that the model can be interpreted probabilistically and that this interpretation leads to physical restrictions on solute molecule transport through the inlet and exit boundaries of a soil column. These constraints, in turn, show that the correct exit boundary condition for a freely draining soil column is zero resident concentration or, equivalently, zero gradient in the flux concentration. This boundary constraint is combined with conditions appropriate to either an open or a closed inlet boundary to derive a variety of mass‐conserving solutions (some apparently new) to the convection‐dispersion model for both resident and flux concentrations. In particular, a new solution is presented for the resident concentration under a closed inlet boundary. The corresponding flux concentration solution for a constant solute flux at the inlet is shown to be the same as a solution first obtained by R.W. Cleary and D.D. Adrian (1973).