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פותח על ידי קלירמאש פתרונות בע"מ -
Numerical analysis of flow and transport in a three-dimensional partially saturated heterogeneous soil
Year:
1998
Source of publication :
Water Resources Research
Authors :
לאופר, אשר
;
.
רוסו, דוד
;
.
Volume :
34
Co-Authors:
Russo, D., Department of Soil Physics, Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan, Israel, Department of Soil Physics, Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan 50250, Israel
Zaidel, J., Department of Soil Physics, Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan, Israel, Dames and Moore Canada, Mississauga, Ont., Canada, Dames and Moore Canada, 7560 Airport Road, Mississauga, Ont. L4T 2H5, Canada
Laufer, A., Department of Soil Physics, Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan, Israel, Department of Soil Physics, Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
1451
To page:
1468
(
Total pages:
18
)
Abstract:
Numerical simulation of flow and transport of tracer and reactive (sorptive) solutes was used to investigate solute spreading and breakthrough in a realistic, three-dimensional, heterogeneous, partially saturated soil, along with realistic weather boundary conditions, considering water uptake by plant roots. Results of the analyses suggest that the combination of spatially variable soil properties and periodic infiltration with substantial redistribution periods may impart a pseudokinetic behavior to the large-scale sorption and create a three-dimensional velocity fluctuation field with significant transverse components. The resultant velocity fluctuation field promotes lateral mixing of the solute, smooths out the extremes in solute convection, slows down the longitudinal spreading of the solute plume and increases its transverse spreading, reduces the skewing of the solute breakthrough, and leads to an approximately Fickian behavior of the transport. Water uptake by the plant roots is shown to increase the variability in the response of the flow domain and to produce a drier soil profile, with lower conductivity and steeper head gradient. Consequently, it reduces the solute velocity in the vertical direction, smooths its heterogeneity, and further diminishes the longitudinal spreading of the solute plume and the skewing of the solute breakthrough. Sorption also reduces the solute velocity in the vertical direction. For the physically plausible situation in which log retardation factor is negatively correlated with log saturated conductivity, sorption contributes to the variability in the solute velocity and increases both the longitudinal spreading of the solute plume and the skewing of the solute breakthrough.
Note:
Related Files :
Partially saturated soils
Resultant velocities
Soils
Soil testing
Sorption
Velocity
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
24730
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:09
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Scientific Publication
Numerical analysis of flow and transport in a three-dimensional partially saturated heterogeneous soil
34
Russo, D., Department of Soil Physics, Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan, Israel, Department of Soil Physics, Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan 50250, Israel
Zaidel, J., Department of Soil Physics, Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan, Israel, Dames and Moore Canada, Mississauga, Ont., Canada, Dames and Moore Canada, 7560 Airport Road, Mississauga, Ont. L4T 2H5, Canada
Laufer, A., Department of Soil Physics, Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan, Israel, Department of Soil Physics, Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan 50250, Israel
Numerical analysis of flow and transport in a three-dimensional partially saturated heterogeneous soil
Numerical simulation of flow and transport of tracer and reactive (sorptive) solutes was used to investigate solute spreading and breakthrough in a realistic, three-dimensional, heterogeneous, partially saturated soil, along with realistic weather boundary conditions, considering water uptake by plant roots. Results of the analyses suggest that the combination of spatially variable soil properties and periodic infiltration with substantial redistribution periods may impart a pseudokinetic behavior to the large-scale sorption and create a three-dimensional velocity fluctuation field with significant transverse components. The resultant velocity fluctuation field promotes lateral mixing of the solute, smooths out the extremes in solute convection, slows down the longitudinal spreading of the solute plume and increases its transverse spreading, reduces the skewing of the solute breakthrough, and leads to an approximately Fickian behavior of the transport. Water uptake by the plant roots is shown to increase the variability in the response of the flow domain and to produce a drier soil profile, with lower conductivity and steeper head gradient. Consequently, it reduces the solute velocity in the vertical direction, smooths its heterogeneity, and further diminishes the longitudinal spreading of the solute plume and the skewing of the solute breakthrough. Sorption also reduces the solute velocity in the vertical direction. For the physically plausible situation in which log retardation factor is negatively correlated with log saturated conductivity, sorption contributes to the variability in the solute velocity and increases both the longitudinal spreading of the solute plume and the skewing of the solute breakthrough.
Scientific Publication
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