Modified Kostiakov Infiltration Function: Accounting for Initial and Boundary Conditions
Publication: Journal of Irrigation and Drainage Engineering
Volume 132, Issue 6
Abstract
The effect of specific initial and boundary conditions is generally not considered when applying the Kostiakov infiltration functions. A methodology is developed to account for changes in water levels and initial soil moisture. First, Richards’ equation is solved numerically to generate a database of one-dimensional infiltration values, with varying initial (water content or pressure head) and boundary (ponding depth) conditions for three contrasting soils. These are then used to calibrate corresponding coefficients for modified Kostiakov models and, by considering linear regressions, to obtain simple correction factors. Results show that the correction factors are not universally valid, and only the correction to the Kostiakov parameter shows statistically consistent applicability. However, examples demonstrate potentially significant improvement in the accuracy of irrigation models by correcting the Kostiakov equation to account for initial and boundary conditions.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 132 • Issue 6 • December 2006
Pages: 587 - 596
Copyright
© 2006 ASCE.
History
Received: May 21, 2004
Accepted: Jan 4, 2006
Published online: Dec 1, 2006
Published in print: Dec 2006
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