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Numerical analysis of flow and transport in a combined heterogeneous vadose zone-groundwater system
Year:
2000
Source of publication :
Advances in Water Resources
Authors :
Laufer, Asher
;
.
Russo, David
;
.
Volume :
24
Co-Authors:
Russo, D., Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Volcani Center, Bet Dagan 50250, Israel
Zaidel, J., Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Volcani Center, Bet Dagan 50250, Israel
Laufer, A., Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
49
To page:
62
(
Total pages:
14
)
Abstract:
Numerical simulations of water flow and solute transport were used to investigate the effect of the recharge (rain/irrigation) at the soil surface on solute spreading and breakthrough in a realistic, three-dimensional, heterogeneous, vadose zone-groundwater flow system. Results of the analyses suggest that smaller recharge at the soil surface increases the relative variability in the response of the unsaturated flow system, decreases the groundwater recharge from the unsaturated zone, and, concurrently, decreases the degree of nonuniformity of the groundwater flow. Consequently, smaller recharge at the soil surface enhances the longitudinal and, especially the transverse spreading of the solute plume and increases the spreading of the expected solute BTC at the lower boundary of the unsaturated zone. Furthermore, smaller recharge at the soil surface decreases the extent of the vertical penetration of the solute plume into the groundwater, slows the peak arrival of the expected BTC, and considerably increases the spreading of the expected solute BTC at a given vertical control plane in the saturated region. It was shown that for the combined flow system considered here in which the solute plume is displaced to a sufficiently large vertical distance from the inlet zone at the soil surface, the variable that controls the transport is the cumulative recharge at the soil surface, and not the recharge rate. (C) 2000 Elsevier Science Ltd. All rights reserved.Numerical simulations of water flow and solute transport were used to investigate the effect of the recharge (rain/irrigation) at the soil surface on solute spreading and breakthrough in a realistic, three-dimensional, heterogeneous, vadose zone-groundwater flow system. Results of the analyses suggest that smaller recharge at the soil surface increases the relative variability in the response of the unsaturated flow system, decreases the groundwater recharge from the unsaturated zone, and, concurrently, decreases the degree of nonuniformity of the groundwater flow. Consequently, smaller recharge at the soil surface enhances the longitudinal and, especially the transverse spreading of the solute plume and increases the spreading of the expected solute BTC at the lower boundary of the unsaturated zone. Furthermore, smaller recharge at the soil surface decreases the extent of the vertical penetration of the solute plume into the groundwater, slows the peak arrival of the expected BTC, and considerably increases the spreading of the expected solute BTC at a given vertical control plane in the saturated region. It was shown that for the combined flow system considered here in which the solute plume is displaced to a sufficiently large vertical distance from the inlet zone at the soil surface, the variable that controls the transport is the cumulative recharge at the soil surface, and not the recharge rate.
Note:
Related Files :
computer simulation
recharge
Transport properties
vadose zone
Show More
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More details
DOI :
10.1016/S0309-1708(00)00026-9
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
22865
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:54
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Scientific Publication
Numerical analysis of flow and transport in a combined heterogeneous vadose zone-groundwater system
24
Russo, D., Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Volcani Center, Bet Dagan 50250, Israel
Zaidel, J., Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Volcani Center, Bet Dagan 50250, Israel
Laufer, A., Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Volcani Center, Bet Dagan 50250, Israel
Numerical analysis of flow and transport in a combined heterogeneous vadose zone-groundwater system
Numerical simulations of water flow and solute transport were used to investigate the effect of the recharge (rain/irrigation) at the soil surface on solute spreading and breakthrough in a realistic, three-dimensional, heterogeneous, vadose zone-groundwater flow system. Results of the analyses suggest that smaller recharge at the soil surface increases the relative variability in the response of the unsaturated flow system, decreases the groundwater recharge from the unsaturated zone, and, concurrently, decreases the degree of nonuniformity of the groundwater flow. Consequently, smaller recharge at the soil surface enhances the longitudinal and, especially the transverse spreading of the solute plume and increases the spreading of the expected solute BTC at the lower boundary of the unsaturated zone. Furthermore, smaller recharge at the soil surface decreases the extent of the vertical penetration of the solute plume into the groundwater, slows the peak arrival of the expected BTC, and considerably increases the spreading of the expected solute BTC at a given vertical control plane in the saturated region. It was shown that for the combined flow system considered here in which the solute plume is displaced to a sufficiently large vertical distance from the inlet zone at the soil surface, the variable that controls the transport is the cumulative recharge at the soil surface, and not the recharge rate. (C) 2000 Elsevier Science Ltd. All rights reserved.Numerical simulations of water flow and solute transport were used to investigate the effect of the recharge (rain/irrigation) at the soil surface on solute spreading and breakthrough in a realistic, three-dimensional, heterogeneous, vadose zone-groundwater flow system. Results of the analyses suggest that smaller recharge at the soil surface increases the relative variability in the response of the unsaturated flow system, decreases the groundwater recharge from the unsaturated zone, and, concurrently, decreases the degree of nonuniformity of the groundwater flow. Consequently, smaller recharge at the soil surface enhances the longitudinal and, especially the transverse spreading of the solute plume and increases the spreading of the expected solute BTC at the lower boundary of the unsaturated zone. Furthermore, smaller recharge at the soil surface decreases the extent of the vertical penetration of the solute plume into the groundwater, slows the peak arrival of the expected BTC, and considerably increases the spreading of the expected solute BTC at a given vertical control plane in the saturated region. It was shown that for the combined flow system considered here in which the solute plume is displaced to a sufficiently large vertical distance from the inlet zone at the soil surface, the variable that controls the transport is the cumulative recharge at the soil surface, and not the recharge rate.
Scientific Publication
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