Direct Solution to Surface Irrigation Advance Inverse Problem
Publication: Journal of Irrigation and Drainage Engineering
Volume 117, Issue 4
Abstract
A modification to the double‐sweep routine commonly used to solve the continuity and momentum equations for surface irrigation models has been developed to allow the solution of one global parameter at each time step. Coefficients for the double‐sweep routine are presented for the Kostiakov infiltration parameter k, the Manning n, and the time step A procedure is also developed for determining the entire infiltration relation (e.g., both Kostiakov exponent a and constant k) during advance. It is shown that this estimated relation is subject to errors caused by assumptions regarding the volume of water in surface storage near the advancing tip. Other errors in field measurements also significantly impact estimates of infiltration and roughness made during advance. Such errors are particularly problematic when trying to use estimates during advance to predict conditions at the end of the irrigation, as is the case for feedback control.
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Information & Authors
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Published In
Journal of Irrigation and Drainage Engineering
Volume 117 • Issue 4 • July 1991
Pages: 578 - 594
Copyright
Copyright © 1991 ASCE.
History
Published online: Jul 1, 1991
Published in print: Jul 1991
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