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Equivalent vadose zone steady state flow: An assessment of its capability to predict transport in a realistic combined vadose zone-groundwater flow system
Year:
2008
Source of publication :
Water Resources Research
Authors :
רוסו, דוד
;
.
Volume :
44
Co-Authors:
Russo, D., Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Volcani Center, Bet Dagan, Israel, Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Volcani Center, Bet Dagan 50250, Israel
Fiori, A., Dipartimento di Scienze dell'Ingegneria Civile, Università di Roma Tre, Rome, Italy, Dipartimento di Scienze dell'Ingegneria Civile, Università di Roma Tre, via Volterra 62, I-00146 Roma, Italy
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From page:
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(
Total pages:
1
)
Abstract:
The applicability of an equivalent steady state vadose zone flow model to a realistic transient three-dimensional, heterogeneous, combined vadose zone-groundwater flow system was tested here. Two cases pertinent to semiarid regions and the presence (or absence) of an irrigated crop were analyzed and are presented in detail using the hydraulic properties from the Bet Dagan trench. In addition, the case of a more humid region characterized by additional summer precipitation and soils of different textures was analyzed and is discussed briefly. Results of the analyses suggested that when the water table is located at sufficiently large distance from the soil surface, the vadose zone can be divided conceptually into two distinct zones: a highly transient, near-surface zone and a deeper, quasi steady state zone. Under these conditions, an equivalent steady state influx, obtained by averaging the cumulative flux of the net applied water over the relevant time period, may provide a relatively good approximation of the cumulative water flux that crossed the water table. As for solute transport, in all cases examined, the trajectories of the centroid of the solute plume and the mean and the standard deviation of the solute breakthrough curves at a given horizontal control plane, CP (expressed as functions of the cumulative flux crossing the pertinent horizontal CP), associated with the transient flows were in relatively good agreement with their counterparts associated with the equivalent steady state flows, particularly under noncropped conditions and when the soil texture is coarser. The main finding of this study is that for the case in which the water table is located at sufficiently large distance from the soil surface, equivalent steady state vadose zone flow may reconstruct the "true" solute BTC (or the solute travel time PDF) at a horizontal CP located in the vicinity of the water table depth. The latter finding applies to heterogeneous soils of different textures and to different atmospheric forcing conditions at the soil surface and in the presence (or absence) of vegetation and despite the fact that features of the transport unique to vadose zone transient flow (induced by the temporal fluctuations in the water table depth) cannot be reproduced by the equivalent steady state vadose zone flow. Copyright 2008 by the American Geophysical Union.
Note:
Related Files :
aquifers
groundwater
hydrogeology
Surface zones
Textures
three-dimensional flow
vadose zone
עוד תגיות
תוכן קשור
More details
DOI :
10.1029/2007WR006170
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
22281
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:50
You may also be interested in
Scientific Publication
Equivalent vadose zone steady state flow: An assessment of its capability to predict transport in a realistic combined vadose zone-groundwater flow system
44
Russo, D., Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Volcani Center, Bet Dagan, Israel, Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Volcani Center, Bet Dagan 50250, Israel
Fiori, A., Dipartimento di Scienze dell'Ingegneria Civile, Università di Roma Tre, Rome, Italy, Dipartimento di Scienze dell'Ingegneria Civile, Università di Roma Tre, via Volterra 62, I-00146 Roma, Italy
Equivalent vadose zone steady state flow: An assessment of its capability to predict transport in a realistic combined vadose zone-groundwater flow system
The applicability of an equivalent steady state vadose zone flow model to a realistic transient three-dimensional, heterogeneous, combined vadose zone-groundwater flow system was tested here. Two cases pertinent to semiarid regions and the presence (or absence) of an irrigated crop were analyzed and are presented in detail using the hydraulic properties from the Bet Dagan trench. In addition, the case of a more humid region characterized by additional summer precipitation and soils of different textures was analyzed and is discussed briefly. Results of the analyses suggested that when the water table is located at sufficiently large distance from the soil surface, the vadose zone can be divided conceptually into two distinct zones: a highly transient, near-surface zone and a deeper, quasi steady state zone. Under these conditions, an equivalent steady state influx, obtained by averaging the cumulative flux of the net applied water over the relevant time period, may provide a relatively good approximation of the cumulative water flux that crossed the water table. As for solute transport, in all cases examined, the trajectories of the centroid of the solute plume and the mean and the standard deviation of the solute breakthrough curves at a given horizontal control plane, CP (expressed as functions of the cumulative flux crossing the pertinent horizontal CP), associated with the transient flows were in relatively good agreement with their counterparts associated with the equivalent steady state flows, particularly under noncropped conditions and when the soil texture is coarser. The main finding of this study is that for the case in which the water table is located at sufficiently large distance from the soil surface, equivalent steady state vadose zone flow may reconstruct the "true" solute BTC (or the solute travel time PDF) at a horizontal CP located in the vicinity of the water table depth. The latter finding applies to heterogeneous soils of different textures and to different atmospheric forcing conditions at the soil surface and in the presence (or absence) of vegetation and despite the fact that features of the transport unique to vadose zone transient flow (induced by the temporal fluctuations in the water table depth) cannot be reproduced by the equivalent steady state vadose zone flow. Copyright 2008 by the American Geophysical Union.
Scientific Publication
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