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Numerical analysis of flow and transport in variably saturated bimodal heterogeneous porous media
Year:
2001
Source of publication :
Water Resources Research
Authors :
Laufer, Asher
;
.
Russo, David
;
.
Volume :
37
Co-Authors:
Russo, D., Department of Environmental Physics, Inst. of Soils, Water/Envtl. Sci., Agricultural Research Organization, Bet Dagan 50250, Israel
Zaidel, J., Department of Environmental Physics, Inst. of Soils, Water/Envtl. Sci., Agricultural Research Organization, Bet Dagan 50250, Israel
Laufer, A., Department of Environmental Physics, Inst. of Soils, Water/Envtl. Sci., Agricultural Research Organization, Bet Dagan 50250, Israel
Facilitators :
From page:
2127
To page:
2141
(
Total pages:
15
)
Abstract:
Numerical simulations of flow and transport of a tracer solute were used to investigate solute spreading and breakthrough in three-dimensional, heterogeneous, partially saturated porous media. Two different media were considered, the properties of which were modeled as a bimodal and as an "equivalent" (same mean and variance but not the same two-point covariance), unimodal spatially correlated random functions. The bimodal medium consisted of a spatially distributed background soil and randomly dispersed low-permeability clay lenses which occupied 10% of the media volume. Both time-invariant and periodic influx (rain/irrigation) rates at the soil surface were considered in this investigation. Under steady state flow conditions originating from a time-invariant influx rate at the soil surface, when the soil is relatively wet, the difference between the hydraulic responses of the bimodal medium and the unimodal medium increased with increasing influx rate. For a given influx regime at the soil surface the embedded clay lenses associated with the bimodal medium are shown to enhance both solute spreading and the skewing of solute breakthrough curves considerably. Transient flow, originating from a periodic influx at the soil surface, which, in turn, is characterized by substantial redistribution periods with diminishing water saturation, may considerably decrease the difference between the responses of the two media. The latter result stems from the fact that in the bimodal medium considered in this investigation, for the range of water saturations pertinent to the redistribution periods, the difference between the conductivities of the background soil and the embedded clay lenses diminishes substantially.
Note:
Related Files :
Bimodal heterogeneous porous media
computer simulation
heterogeneous medium
soil
Solute transport
Transport properties
Show More
Related Content
More details
DOI :
10.1029/2001WR000393
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
30607
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:55
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Scientific Publication
Numerical analysis of flow and transport in variably saturated bimodal heterogeneous porous media
37
Russo, D., Department of Environmental Physics, Inst. of Soils, Water/Envtl. Sci., Agricultural Research Organization, Bet Dagan 50250, Israel
Zaidel, J., Department of Environmental Physics, Inst. of Soils, Water/Envtl. Sci., Agricultural Research Organization, Bet Dagan 50250, Israel
Laufer, A., Department of Environmental Physics, Inst. of Soils, Water/Envtl. Sci., Agricultural Research Organization, Bet Dagan 50250, Israel
Numerical analysis of flow and transport in variably saturated bimodal heterogeneous porous media
Numerical simulations of flow and transport of a tracer solute were used to investigate solute spreading and breakthrough in three-dimensional, heterogeneous, partially saturated porous media. Two different media were considered, the properties of which were modeled as a bimodal and as an "equivalent" (same mean and variance but not the same two-point covariance), unimodal spatially correlated random functions. The bimodal medium consisted of a spatially distributed background soil and randomly dispersed low-permeability clay lenses which occupied 10% of the media volume. Both time-invariant and periodic influx (rain/irrigation) rates at the soil surface were considered in this investigation. Under steady state flow conditions originating from a time-invariant influx rate at the soil surface, when the soil is relatively wet, the difference between the hydraulic responses of the bimodal medium and the unimodal medium increased with increasing influx rate. For a given influx regime at the soil surface the embedded clay lenses associated with the bimodal medium are shown to enhance both solute spreading and the skewing of solute breakthrough curves considerably. Transient flow, originating from a periodic influx at the soil surface, which, in turn, is characterized by substantial redistribution periods with diminishing water saturation, may considerably decrease the difference between the responses of the two media. The latter result stems from the fact that in the bimodal medium considered in this investigation, for the range of water saturations pertinent to the redistribution periods, the difference between the conductivities of the background soil and the embedded clay lenses diminishes substantially.
Scientific Publication
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