Introduced by Richards , the Richards’ equation is used to mathematically describe water movement in the unsaturated zone. Theoretically, the equation is also a sort of simplification of the two-phase flow equations of water-air processes in porous media under the constant gas pressure condition.
KeywordsPore Pressure Water Pressure Capillary Pressure Water Saturation Relative Permeability
- 1.L.A. Richards. Capillary conduction of liquids through porous mediums. Physics A-J Gen. Appl. Phys., 1(1):318–333, 1931.Google Scholar
- 2.M.T. VanGenuchten and P.J. Wierenga. Mass-transfer studies in sorbing porous-media. 1. Analytical solutions. Soil Sci. Soc. Am. J., 40(4):473–480, 1976.Google Scholar
- 3.Y. Mualem. New model for predicting hydraulic conductivity of unsaturated porous-media. Water Resour. Res., 12(3):513–522, 1976.Google Scholar
- 4.J.K. Zhou. Differential transformation and its applications for electrical circuits. Huazhong University Press, 1986.Google Scholar
- 5.W.V. Abeele M.L. Wheeler and B.W. Burton. Geohydrology of bandelier tuff. Los Alamos National Laboratory report, LA-8962-MS, 1981.Google Scholar
- 6.H. S. Carslaw and J. C. Jaeger. Conduction of heat in solids. Oxford University Press, London, 2nd edition, 1959.Google Scholar