Record Display for the EPA National Library Catalog

RECORD NUMBER: 17 OF 24

OLS Field Name OLS Field Data
Main Title Numerical Modeling of Unsaturated Ground-Water Flow Including Effects of Evapotranspiration.
Author Gree, Don W. ; Dabir, Hassan ; Khar, J. D. ;
CORP Author Kansas Water Resources Research Inst., Manhattan.
Year Published 1972
Report Number Contrib-72; DI-14-31-0001-3084; OWRR-B-018-KAN; OWRR-B-018-KAN(1),; 05089
Stock Number PB-207 135
Additional Subjects ( Ground water ; Fluid flow) ; ( Soil water ; Evapotranspiration) ; ( Two phase flow ; Mathematical models) ; Nonlinear differential equations ; Atmospheric motion ; Numerical integration ; Computer programs ; Permeability ; Porosity ; Simulation ; Partial differential equations ; Plants ; Climatology ; Finite difference theory ; Kansas ;
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB-207 135 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 195p
Abstract
A mathematical model describing two-phase flow in porous media has been developed. The model, which consists of describing differential equations and an algorithm for their numerical solution, is applicable to the problem of one dimensional, vertical ground water movement in unsaturated soils, considering evaporation and transpiration losses (evapotranspiration). The model is a major extension of one presented earlier by the authors which describes unsaturated flow in the absence of evapotranspiration. The second order, non linear, partial differential equations describing water-air flow through porous media have been extended to include water losses due to unsteady-state evapotranspiration. The basis of the extension is an analogy to Ohm's law. The water transport in the soil atmosphere or the soil plant-atmosphere system has been considered to take place due to the existence of successively decreasing driving-force potentials from the soil to the atmosphere. (Author)