| dc.contributor.author |
Valiantzas, JD |
en |
| dc.contributor.author |
Pollalis, ED |
en |
| dc.contributor.author |
Soulis, KX |
en |
| dc.contributor.author |
Londra, PA |
en |
| dc.date.accessioned |
2014-06-06T06:49:28Z |
|
| dc.date.available |
2014-06-06T06:49:28Z |
|
| dc.date.issued |
2009 |
en |
| dc.identifier.issn |
07339437 |
en |
| dc.identifier.uri |
http://dx.doi.org/10.1061/(ASCE)IR.1943-4774.0000011 |
en |
| dc.identifier.uri |
http://62.217.125.90/xmlui/handle/123456789/4617 |
|
| dc.subject |
Hydrologic models |
en |
| dc.subject |
Infiltration |
en |
| dc.subject |
Surface irrigation |
en |
| dc.subject |
Water content |
en |
| dc.subject.other |
Algebraic equations |
en |
| dc.subject.other |
Empirical coefficients |
en |
| dc.subject.other |
Field conditions |
en |
| dc.subject.other |
Hydrologic models |
en |
| dc.subject.other |
Kostiakov equations |
en |
| dc.subject.other |
Physical parameters |
en |
| dc.subject.other |
Ponding depths |
en |
| dc.subject.other |
Sorptivity |
en |
| dc.subject.other |
Surface irrigation |
en |
| dc.subject.other |
Boundary conditions |
en |
| dc.subject.other |
Irrigation |
en |
| dc.subject.other |
Seepage |
en |
| dc.subject.other |
Soil mechanics |
en |
| dc.subject.other |
Soils |
en |
| dc.subject.other |
Water content |
en |
| dc.subject.other |
Water levels |
en |
| dc.subject.other |
Hydraulic models |
en |
| dc.subject.other |
boundary condition |
en |
| dc.subject.other |
empirical analysis |
en |
| dc.subject.other |
hydrological modeling |
en |
| dc.subject.other |
infiltration |
en |
| dc.subject.other |
irrigation |
en |
| dc.subject.other |
methodology |
en |
| dc.subject.other |
water content |
en |
| dc.title |
Modified form of the extended kostiakov equation including various initial and boundary conditions |
en |
| heal.type |
journalArticle |
en |
| heal.identifier.primary |
10.1061/(ASCE)IR.1943-4774.0000011 |
en |
| heal.publicationDate |
2009 |
en |
| heal.abstract |
The extended Kostiakov equation is intensively used in surface irrigation applications. Traditionally, the extended Kostiakov infiltration formula is calibrated for specific field conditions. However, there is a dependence of the extended Kostiakov coefficients on both initial and boundary conditions. In this paper, a new simplified methodology is developed to account extended Kostiakov κ variation for these effects. The purely empirical extended Kostiakov equation is transformed to a form of a modified version of the classical Philip two-term equation. This modification relates a physical parameter, the soil sorptivity S, with the purely empirical coefficient κ of the extended Kostiakov formula. Then, the variation of the sorptivity S for various water levels and initial water contents is given theoretically by a simple algebraic equation. The proposed correction was compared with numerical infiltration data with varying initial (water content) and boundary conditions (ponding depth) for two contrasting soils. Results indicate that the corrected infiltration curves converge well with the simulated ones. © ASCE 2009. |
en |
| heal.journalName |
Journal of Irrigation and Drainage Engineering |
en |
| dc.identifier.issue |
4 |
en |
| dc.identifier.volume |
135 |
en |
| dc.identifier.doi |
10.1061/(ASCE)IR.1943-4774.0000011 |
en |
| dc.identifier.spage |
450 |
en |
| dc.identifier.epage |
458 |
en |