Field Verification of Two-Dimensional Surface Irrigation Model
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VIEW THE ORIGINAL ARTICLEPublication: Journal of Irrigation and Drainage Engineering
Volume 129, Issue 6
Abstract
A two-dimensional (2D) model of unsteady shallow-water flow in surface irrigation was developed to evaluate the influence of field-grading precision on surface irrigation performance. This paper presents field data for verification of this 2D model. No attempt was made here to evaluate irrigation performance. Verification of such models relies on independent estimates of parameters for infiltration and roughness. To accomplish this, water surface elevations were measured at 26 points within a 3 ha level basin. A double-bubbler system was used to obtain relative water depths. Field surveys were used to convert these to water surface elevations and field water depths, from which surface water volumes over time were computed. The infiltration function was determined by matching inflow minus surface volume over time with computed subsurface volume. A value of Manning n (0.05) was found for which advance and water depth hydrographs were both well predicted with the 2D model. Differences in advance for a plane versus undulating field surface were minor, except near the end of advance.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 129 • Issue 6 • December 2003
Pages: 402 - 411
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Aug 22, 2000
Accepted: Dec 16, 2002
Published online: Nov 14, 2003
Published in print: Dec 2003
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