| Autor: |
Dennis E. Rolston, S. E. Jones, R. S. Govindaraju, M. L. Kavvas |
| Rok vydání: |
1996 |
| Předmět: |
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| Zdroj: |
Journal of Hydrology. 178:337-350 |
| ISSN: |
0022-1694 |
| DOI: |
10.1016/0022-1694(95)02796-3 |
| Popis: |
A general analytical solution to the equation describing purely convective vertical transport of a conservative solute under transient water flow conditions is presented. Richards equation does not yield analytical solutions for the flow field, except under restrictive choices of hydraulic properties relating water content, hydraulic conductivity and the soil matric potential. The utility of the Green-Ampt model for homogeneous unsaturated soils is investigated as an alternative to Richards equation. This model, though approximate, provides analytical solutions to the flow field. It is found that the flow quantities required for the analytical solution of convective transport (specifically the soil water storage) are predicted accurately by the Green-Ampt model. Comparisons of numerical and analytical solutions of solute concentration profiles suggest that the Green-Ampt water flow model is adequate for convective solute transport predictions, and that the flow field need not be computed by the more numerically expensive Richards equation for this problem. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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