Record Display for the EPA National Library Catalog


Main Title Areal Prediction of Water and Solute Flux in the Unsaturated Zone.
Author Warrick, Arthur W. ; Amoozegar-Fard, Azizolah ;
CORP Author Arizona Univ., Tucson. Dept. of Soils, Water and Engineering.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Year Published 1981
Report Number EPA-R-804751; EPA-600/2-81-058;
Stock Number PB81-191124
Additional Subjects Soil analysis ; Flux rate ; Irrigation ; Drainage ; Salts ; Diffusion ; Water ; Velocity ; Soil water movement
Library Call Number Additional Info Location Last
NTIS  PB81-191124 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 88p
The areal distribution of water and solutes over land was studied. This was done by examining data sets available from previous studies as well as by flow simulations. Most of the simulations of salt and water movement were by the 'crude' Monte Carlo technique. For infiltration, 'Philip's formula was solved once in a scaled form, after which results were algebraic without repeating the laborious steps. Similarly, drainage calculations were made very efficient by utilizing a scaled form of the nonlinear moisture flow equation. Salt distributions were considered for cases of equal irrigation amounts, but with intake rates varying over space. Deterministic calculations based on the mean velocity and apparent diffusion coefficient gave erroneous results for both fluxes and distributions of salts in the profile. The true average distribution is much more dispersed with more salts reaching deep depths and also more salts near the surface. Similarly, the mass emissions of salts averaged over a field appears earlier than would be calculated by using mean velocities.