| Автор | Liakopoulos, Aristides C. |
| Дата выпуска | 1966 |
| dc.description | The transient values of water pressure, water content, and rate of water evaporation from soils can be predicted theoretically from the mathematical model representing the physical problem of the evaporation phenomenon from soils. Evaporation of water from a soil surface is an initial‐value problem arising in many cases of water transfer through soils. A nonsteady state exists that leads to the mathematical model of a nonlinear parabolic partial differential equation in which the time and the position in the vertical direction are taken as the independent variables and the volumetric water content as the dependent variable. Because of the strong nonlinearity, the governing partial differential equation is approximated by finite differences at discrete mesh points in the solution domain and is integrated for initial and boundary conditions corresponding to the evaporation phenomenon. The procedure for the numerous calculations required for the numerical integration is programmed in Fortran coding language, and fast answers consisting of transient values for the pressure distribution, water content, and evaporation rate are obtained with the aid of an electronic digital computer IBM 704. (Key words: Evaporation; porous mediums; soil moisture; unsaturated flow.) |
| Формат | application.pdf |
| Копирайт | Copyright 1966 by the American Geophysical Union. |
| Название | Theoretical prediction of evaporation losses from groundwater |
| Тип | article |
| DOI | 10.1029/WR002i002p00227 |
| Electronic ISSN | 1944-7973 |
| Print ISSN | 0043-1397 |
| Журнал | Water Resources Research |
| Том | 2 |
| Первая страница | 227 |
| Последняя страница | 240 |
| Выпуск | 2 |
| Библиографическая ссылка | Child, E. C., N.Collis‐George, The permeability of porous materials, Proc. Roy. Soc., A20, 392–405, 1950. |
| Библиографическая ссылка | Liakopoulos, A. C., Transient flow through unsaturated porous media, Doctor of Engineering thesis,University of California,Berkeley,1964. |
| Библиографическая ссылка | Liakopoulos, A. C., Theoretical aspects of the flow of water through anisotropic unsaturated soils, Bull. Intern. Assoc. Sci. Hydrol., 91, 62–70, 1964. |
| Библиографическая ссылка | Richtmyer, R. D., Difference Methods for Initial‐Value Problems, Interscience Publishers, Inc., New York, 1957. |
