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Evaluating the relative air permeability of porous media from their water retention curves
Year:
2016
Source of publication :
Water Resources Research
Authors :
Assouline, Shmuel
;
.
Volume :
52
Co-Authors:
Assouline, S., Institute of Soil, Water and Environmental Sciences, A.R.O.—Volcani Center, Bet Dagan, Israel
Tuli, A., California Environmental Protection Agency, Department of Pesticide Regulation, Environmental Monitoring Branch, Sacramento, CA, United States
Hopmans, J.W., Hydrology, Department of LAWR, University of California, Davis, CA, United States
Facilitators :
From page:
3428
To page:
3439
(
Total pages:
12
)
Abstract:
Accurate modeling of water and air flow in porous media requires the definition of the relevant hydraulic properties, namely, the water retention curve (WRC) and the relative hydraulic conductivity function (RHC), as well as the definition of the relative air permeability function (RAP). Capitalizing on the approach developed previously to represent the RHC, a new model allowing the prediction of RAP based on information resulting from the WRC is proposed. The power value ηa in the model is a decreasing exponential function of the coefficient of variation, ɛ, characterizing the pore size distribution of the porous medium, and derived from its WRC. The model was calibrated using data from 22 disturbed and undisturbed soil samples and was validated using data from eight soil types ranging from quartz sand to silty clay loam. The proposed model provided accurate prediction of the soil RAP and performed in some cases (sandy loam and silty clay loam soils) better than available alternative models. © 2016. American Geophysical Union. All Rights Reserved.
Note:
Related Files :
Air permeability
Permeability functions
Pore size distribution
size distribution
Soils
Show More
Related Content
More details
DOI :
10.1002/2015WR018286
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
30507
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:55
You may also be interested in
Scientific Publication
Evaluating the relative air permeability of porous media from their water retention curves
52
Assouline, S., Institute of Soil, Water and Environmental Sciences, A.R.O.—Volcani Center, Bet Dagan, Israel
Tuli, A., California Environmental Protection Agency, Department of Pesticide Regulation, Environmental Monitoring Branch, Sacramento, CA, United States
Hopmans, J.W., Hydrology, Department of LAWR, University of California, Davis, CA, United States
Evaluating the relative air permeability of porous media from their water retention curves
Accurate modeling of water and air flow in porous media requires the definition of the relevant hydraulic properties, namely, the water retention curve (WRC) and the relative hydraulic conductivity function (RHC), as well as the definition of the relative air permeability function (RAP). Capitalizing on the approach developed previously to represent the RHC, a new model allowing the prediction of RAP based on information resulting from the WRC is proposed. The power value ηa in the model is a decreasing exponential function of the coefficient of variation, ɛ, characterizing the pore size distribution of the porous medium, and derived from its WRC. The model was calibrated using data from 22 disturbed and undisturbed soil samples and was validated using data from eight soil types ranging from quartz sand to silty clay loam. The proposed model provided accurate prediction of the soil RAP and performed in some cases (sandy loam and silty clay loam soils) better than available alternative models. © 2016. American Geophysical Union. All Rights Reserved.
Scientific Publication
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