PREDICTING HEAT AND WATER FLOW IN A FREEZING/THAWING SOIL WITH NMOL

A program that implements the numerical method of lines (NMOL) was developed for the IBM PC or compatible computer to simulate soil temperature and water redistribution in a field soil during freezing and thawing. NMOL is a numerical solution to initial-boundary value problems. In this study, NMOL was used to solve the coupled heat and water flow in freezing/thawing soil. Measured temperatures at the soil surface and at 17 cm depth were used as boundary conditions of the heat flow solutions. Boundary conditions for water flow solutions were specified as zero flux at the surface and at 17 cm depth. With this program, soil heat and water fluxes were simulated for two different days, the first when the soil was frozen to a depth of 1.5 cm (Test 1) and the second when it was frozen to 0.75 cm (Test 2). The solutions are statistically compared with field measurements and Crank-Nicholson solutions. The predicted temperatures and corresponding times had good agreement with the field measurements, while water and...

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