Record Display for the EPA National Library Catalog


Main Title Analytical Solution to Richards' Equation for a Draining Soil Profile.
Author Warrick, A. W. ; Lomen, D. O. ; Islas., A. ;
CORP Author Arizona Univ., Tucson.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1990
Year Published 1990
Report Number EPA-R-814243; EPA/600/J-90/218;
Stock Number PB91-117200
Additional Subjects Soil properties ; Drainage ; Evaporation ; Soil water ; Soil physics ; Applications of mathematics ; Fluid infiltration ; Diffusivity ; Hydraulic conductivity ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB91-117200 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
Analytical solutions are developed for the Richards' equation following the analysis of Broadbridge and White. Included here is the solution for drainage and redistribution of a partially or deeply wetted profile. Additionally, infiltration for various initial conditions is examined as well as evaporation at the upper boundary. In all cases the surface flux is constant, whether it be zero for drainage, positive for infiltration, or negative for evaporation. The solutions assume specific forms for the soil water diffusivity and hydraulic conductivity functions: a(b - theta) sup (-2) and beta + gamma(b - theta) + lambda/(2(b - theta)), respectively. Here theta is the water content and a, b, gamma, and lambda are constants. (Copyright (c) 1990 by the American Geophysical Union.)