Mathematical Models of Soil Moisture Profiles Using Two-Phase Flow Theory

摘要

Three methods of analysis for prediction of infiltration and water content profiles in a soil column are presented. The first method is the more or less classical finite difference approach except that the governing equations are those deduced from two-phase flow theory. The second method is purely analytical. It 'speaks' as results such as ponding time are obtained explicity in terms of the various parameters of the problem (hydraulic conductivity, effective capillary drive, initial water content, etc.). A third method, a hybrid method, tries to combine the advantages of the numerical and analytical techniques by retaining the versatility of the numerical method and the low cost of the analytical method.