Water movement in soils

摘要: The physical phenomena associated with water movements in soils are examined through a series of simple and concrete examples. Two general analytical tools used systematically to obtain quantitative results. first is appropriate for transient effects the second gravity finite size cavities. A theoretical description this kind helps understand nature phenomena, but solutions not always adequate outdoor conditions. neat soil terms well defined properties may be laboratory experiments under controlled conditions, does take into account large fluctuations, both time position, observed field. Often it possible describe field by more than few average features, e.g., moisture content typical diffusivity, conductivityat saturation. With mind, drastic simplifications have been made whenever simplify ‘rigorous’ solutions. simpler results become practical since they expressed that can measured