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Estimation of finite difference interblock conductivities for simulation of infiltration into initially dry soils
Year:
1992
Source of publication :
Water Resources Research
Authors :
Russo, David
;
.
Volume :
28
Co-Authors:
Zaidel, J.
Russo, D.
Facilitators :
From page:
2285
To page:
2295
(
Total pages:
11
)
Abstract:
Simulations of transient, unsaturated vertical flow in different initially dry homogeneous soils using Richards' equation suggest that, for a relatively coarse numerical grid, there is no universal weighting scheme to estimate interblock conductivities capable of giving an accurate resolution of the resulting steep wetting fronts, except for the scheme associated with the Kirchhoff transformation (KT). The principal drawback of KT is that it can hardly be applied to heterogeneous soils. A new asymptotic weighting (AW) scheme, based on the asymptotic behavior of the hydraulic conductivity function in the vicinity of residual saturation, is proposed. Numerical tests demonstrate that the AW scheme describes wetting fronts in homogeneous soils nearly as accurately as a scheme based on KT. Applicability and robustness of the AW scheme for simulating water infiltration into heterogeneous soils having substantial vertical variation of hydraulic properties are also demonstrated. Extension of the proposed scheme to higher dimensions is straightforward. Copyright 1992 by the American Geophysical Union.
Note:
Related Files :
Dry soil
Infiltration
interblock conductivity
Kirchhoff transform
Richards' equation
Unsaturated flow
vertical flow
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More details
DOI :
10.1029/92WR00914
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
27229
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:29
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Scientific Publication
Estimation of finite difference interblock conductivities for simulation of infiltration into initially dry soils
28
Zaidel, J.
Russo, D.
Estimation of finite difference interblock conductivities for simulation of infiltration into initially dry soils
Simulations of transient, unsaturated vertical flow in different initially dry homogeneous soils using Richards' equation suggest that, for a relatively coarse numerical grid, there is no universal weighting scheme to estimate interblock conductivities capable of giving an accurate resolution of the resulting steep wetting fronts, except for the scheme associated with the Kirchhoff transformation (KT). The principal drawback of KT is that it can hardly be applied to heterogeneous soils. A new asymptotic weighting (AW) scheme, based on the asymptotic behavior of the hydraulic conductivity function in the vicinity of residual saturation, is proposed. Numerical tests demonstrate that the AW scheme describes wetting fronts in homogeneous soils nearly as accurately as a scheme based on KT. Applicability and robustness of the AW scheme for simulating water infiltration into heterogeneous soils having substantial vertical variation of hydraulic properties are also demonstrated. Extension of the proposed scheme to higher dimensions is straightforward. Copyright 1992 by the American Geophysical Union.
Scientific Publication
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