Modified kostiakov infiltration function: Accounting for initial and boundary conditions

TY - JOUR

T1 - Modified kostiakov infiltration function

T2 - Accounting for initial and boundary conditions

AU - Furman, Alex

AU - Warrick, A. W.

AU - Zerihun, Dawit

AU - Sanchez, C. A.

PY - 2006/11

Y1 - 2006/11

N2 - 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 k 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.

AB - 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 k 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.

KW - Boundaries

KW - Hydrologic models

KW - Infiltration

KW - Moisture content

KW - Surface irrigation

KW - Water flow

UR - http://www.scopus.com/inward/record.url?scp=33751075194&partnerID=8YFLogxK

U2 - 10.1061/(ASCE)0733-9437(2006)132:6(587)

DO - 10.1061/(ASCE)0733-9437(2006)132:6(587)

M3 - 文章

AN - SCOPUS:33751075194

SN - 0733-9437

VL - 132

SP - 587

EP - 596

JO - Journal of Irrigation and Drainage Engineering - ASCE

JF - Journal of Irrigation and Drainage Engineering - ASCE

IS - 6

ER -