Modeling Two-Dimensional Infiltration from Irrigation Furrows
Publication: Journal of Irrigation and Drainage Engineering
Volume 130, Issue 4
Abstract
Numerical simulation of the two-dimensional (2D) infiltration process during furrow irrigation requires considerable computational effort, which can be reduced by analytical modeling. This paper deals with the further development of the semianalytical infiltration model FURINF (furrow infiltration). Considering the varying impact of gravity and furrow geometry, the new approach models the impact of furrow geometry on infiltration progress using a transient geometric shape factor as a function of infiltration time and furrow geometry. FURINF portrays 2D infiltration from the wetted furrow perimeter by a series of one-dimensional (1D) infiltration computations that are performed in this paper on the basis of an analytical as well as a numerical solution of the 1D Richards equation. Comparing the FURINF results provided by the analytical and numerical 1D infiltration model confirmed the adequacy and reliability of the robust and simple analytical approach, which only requires soil parameters provided by rather simple measurements. The results and performances of the analytical FURINF model (FURINF-A) are compared within the frame of a sensitivity and error analysis with the outcome of the numerical subsurface flow model HYDRUS-2D considering three different soils.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 130 • Issue 4 • August 2004
Pages: 296 - 303
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jun 17, 2003
Accepted: Nov 14, 2003
Published online: Jul 15, 2004
Published in print: Aug 2004
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