Two‐Dimensional Simulation of Basin Irrigation. I: Theory
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 120, Issue 5
Abstract
Overland flow of water over a porous bed in two spatial dimensions is governed by three partial differential equations accounting for continuity of momentum in the x‐ and y‐directions and continuity of mass. A leapfrog explicit finite‐difference numerical scheme was applied to solve this system of equations for the initial and boundary conditions that characterize level‐basin irrigation. The numerical procedure is stable and robust for different applications, and can accommodate three different inflow configurations: line, corner, and fan. These configurations simulate inflow from an overflowing canal on a field boundary and at point sources from a corner or in the middle of a straight boundary, respectively. A numerical test was performed to assess the effect of grid fineness on the results of the simulation and on central‐processing‐unit time requirement. Data from two field tests were used to validate the model in quasi—one‐dimensional and two‐dimensional conditions.
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Copyright © 1994 American Society of Civil Engineers.
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Received: Nov 19, 1992
Published online: Sep 1, 1994
Published in print: Sep 1994
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