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Two‐dimensional Transport of Solutes During Nonsteady Infiltration from a Trickle Source
Author(s) -
Bresler Eshel
Publication year - 1975
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/sssaj1975.03615995003900040014x
Subject(s) - infiltration (hvac) , mechanics , loam , isotropy , porous medium , rotational symmetry , trickle , cartesian coordinate system , vadose zone , soil water , cylindrical coordinate system , soil science , geotechnical engineering , mathematics , environmental science , porosity , physics , thermodynamics , geometry , geology , computer science , optics , world wide web
A simulation model for analyzing multidimensional simultaneous transfer of a noninteracting solute and water, applicable to infiltration from a trickle source, is developed. The equations describing transient two‐dimensional transport of a solute by diffusion and convection in unsaturated porous media are solved numerically by an approach that eliminates the effect of numerical dispersion. The noniterative alternating‐direction‐implicit finite difference procedure is used. Two mathematical models are considered: (i) a plane flow model involving the Cartesian coordinates x and z , and (ii) an axisymmetric flow model described by the cylindrical coordinates r and z . An example of transport in a homogeneous, isotropic and stable sand and loam soil systems is given. Results are shown for typical cases of trickle infiltration to demonstrate the effects of trickle discharge and soil‐hydraulic properties on the pattern of salt distribution in the wetted soil zone. The numerical results show that the approach presented may be useful in analyzing two‐dimensional solute transport processes in soils.