Showing papers by "Reinder A. Feddes published in 1975"

Finite Element Analysis of Two-Dimensional Flow in Soils Considering Water Uptake by Roots: II. Field Applications

Abstract: Part I of this paper described a Galerkin-type finite element approach to the simulation of two-dimensional transient flow in saturated-unsaturated soils considering evaporation and water uptake by roots. The purpose of Part II is to verify the numerical model against field measurements, to compare the-results with those obtained by a finite difference technique, and to show how the finite element method can be applied to complex but realistic two-dimensional flow situations. Two examples are given. The first concerns one-dimensional flow and it compares numerical results with those obtained experimentally in the field from water balance studies on red cabbage (Brassica oleracea L. ‘Rode Herfst’) grown on a clay soil in the presence of a water table. The second example describes two-dimensional flow in a complex field situation in The Netherlands where flow takes place under cropped field conditions through five anisotropic layers. Water is supplied to the system by infiltration from two unlined ditches and is withdrawn from the system by evapotranspiration and by leakage to an underlying pumped aquifier.