关键词: 土壤扩散系数, 土壤内边界, 土壤平均湿度, 土壤水分扩散毛细作用

Abstract: In the study of water flow through soil, an important part is to choose correct diffusion scheme in calculating soil water capillary conductivity. It is critical in studying the property of soil water diffusivity by correctly using difference scheme of diffusivity coefficients in diffusion equations. In this paper, a set of new difference scheme of diffusivity coefficients has been developed to adapt to the calculation of soil water capillary conductivity in interior boundary between two neighbouring model layers. The results are satisfactory by controlled infiltration tests.

Key words: soil diffusivity coefficient, soil wetness, capillary function, soil interior boundary