Surface Irrigation Advance Equation: Variation of Subsurface Shape Factor
Publication: Journal of Irrigation and Drainage Engineering
Volume 123, Issue 4
Abstract
The volume balance (VB) algebraic equations based on the power advance assumption (i.e., the time invariance of the subsurface shape factor) may deviate significantly from accurate VB numerical solutions. By systematic analysis of the accurate VB numerical solutions obtained using the Kostiakov infiltration formula, the behavior of the subsurface shape factor as a function of time is examined. A new equation describing the time variation of the subsurface factor is derived. Using dimensionless analysis the new VB algebraic equation is demonstrated over the practical range of variation of surface irrigation parameters. The validation of the new VB equation is extended to infiltration formulas of any mathematical form. Comparison tests indicate that the suggested VB equation is more accurate than previous equations that assume time invariance of the subsurface factor.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 123 • Issue 4 • July 1997
Pages: 300 - 306
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Jul 1, 1997
Published in print: Jul 1997
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