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פותח על ידי קלירמאש פתרונות בע"מ -
Stochastic analysis of macrodispersion in gravity-dominated flow through bimodal heterogeneous unsaturated formations
Year:
2002
Source of publication :
Water Resources Research
Authors :
רוסו, דוד
;
.
Volume :
38
Co-Authors:
Russo, D., Department of Environmental Physics, Inst. of Soils, Water/Environ. Sci., Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
191
To page:
1914
(
Total pages:
1724
)
Abstract:
First-order analysis, based on a stochastic continuum presentation of the flow and a general Lagrangian description of the transport, was used to investigate the effects of a few characteristics of a bimodal, heterogeneous, partially saturated formation, on the principal components of the time-dependent macrodispersion coefficient, under steady state, unsaturated flow conditions. Results of the present analysis show that generally, a bimodal distribution of the formation properties, characterized by a relatively complex spatial correlation structure, contributes to the variability in water velocity and, consequently, may considerably enhance solute spreading. This applies especially in formations in which (1) the correlation length scales and the variances of the soil properties associated with the embedded soil are much larger than those of the background soil, (2) the contrast between mean properties of the two subdomains is large, (3) mean water saturation is relatively small, and (4) the volume fraction of the flow domain occupied by the embedded soil is relatively large. One of the major findings of this study is the important role played by the formation parameter α under unsaturated flow conditions. Consequently, the macrodispersion in a bimodal, unsaturated formation may be larger than its counterpart in a saturated formation, especially when the degree of saturation decreases, when the volume fraction of the flow domain occupied by the embedded soil increases, when the disparity between the correlation length scales of the two subdomains is relatively small, and when the texture of the embedded soil is coarser than that of the background soil.
Note:
Related Files :
Bimodal formations
heterogeneous medium
Macrodispersion
Random processes
soil
Soils
Spatial heterogeneity
stochasticity
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תוכן קשור
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DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
22121
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:49
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Scientific Publication
Stochastic analysis of macrodispersion in gravity-dominated flow through bimodal heterogeneous unsaturated formations
38
Russo, D., Department of Environmental Physics, Inst. of Soils, Water/Environ. Sci., Volcani Center, Bet Dagan 50250, Israel
Stochastic analysis of macrodispersion in gravity-dominated flow through bimodal heterogeneous unsaturated formations
First-order analysis, based on a stochastic continuum presentation of the flow and a general Lagrangian description of the transport, was used to investigate the effects of a few characteristics of a bimodal, heterogeneous, partially saturated formation, on the principal components of the time-dependent macrodispersion coefficient, under steady state, unsaturated flow conditions. Results of the present analysis show that generally, a bimodal distribution of the formation properties, characterized by a relatively complex spatial correlation structure, contributes to the variability in water velocity and, consequently, may considerably enhance solute spreading. This applies especially in formations in which (1) the correlation length scales and the variances of the soil properties associated with the embedded soil are much larger than those of the background soil, (2) the contrast between mean properties of the two subdomains is large, (3) mean water saturation is relatively small, and (4) the volume fraction of the flow domain occupied by the embedded soil is relatively large. One of the major findings of this study is the important role played by the formation parameter α under unsaturated flow conditions. Consequently, the macrodispersion in a bimodal, unsaturated formation may be larger than its counterpart in a saturated formation, especially when the degree of saturation decreases, when the volume fraction of the flow domain occupied by the embedded soil increases, when the disparity between the correlation length scales of the two subdomains is relatively small, and when the texture of the embedded soil is coarser than that of the background soil.
Scientific Publication
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