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פותח על ידי קלירמאש פתרונות בע"מ -
Block-effective macrodispersion in variably saturated heterogeneous formations
Year:
2003
Source of publication :
Water Resources Research
Authors :
רוסו, דוד
;
.
Volume :
39
Co-Authors:
Russo, D., Dept. of Environ. Phys. and Irrigat., Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan, Israel, Dept. of Environ. Phys. and Irrigat., Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan, 50-250, Israel
Facilitators :
From page:
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(
Total pages:
1
)
Abstract:
Numerical models are frequently used in order to quantify the effect of the spatial heterogeneity in the formation hydraulic properties on field-scale solute transport. Because of practical constraints it is common to discretize the flow domain into relatively large numerical cells, with characteristic length scales, l1, l2, l3, comparable with those of the formation heterogeneity, I1, I2, I 3, leading to a loss in the velocity variability, and, concurrently, in solute spreading. We analyzed block-effective dispersion coefficients, D ij′ (i, j = 1, 2, 3), required to compensate for this loss in three-dimensional, variably saturated heterogeneous formations under conditions of steady state, gravity-dominated, unsaturated flow. The results that the principal components of Dij′ are controlled by the ratio l′ = l2/I2 = l3/I3, that they may reach their ergodic limits l′ is sufficiently large, and that their tendency to their asymptotic limits with increasing scaled travel time, t′, is inversely related to l′, are in agreement with previous results for saturated flow. New findings suggest that under unsaturated flow conditions, both the time required to reach the asymptotic limits of D ij′ and the length scale needed to reach the ergodic limits of Dij′ depend on soil stratification, soil texture, and mean soil water saturation and differ for the longitudinal and the transverse components of Dij′.
Note:
Related Files :
heterogeneity
heterogeneous medium
HYDRAULICS
Macrodispersions
Rhodococcus rhodochrous
Soils
Spatial heterogeneity
עוד תגיות
תוכן קשור
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DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
31044
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:59
Scientific Publication
Block-effective macrodispersion in variably saturated heterogeneous formations
39
Russo, D., Dept. of Environ. Phys. and Irrigat., Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan, Israel, Dept. of Environ. Phys. and Irrigat., Inst. Soils, Water and Environ. Sci., Volcani Center, Bet Dagan, 50-250, Israel
Block-effective macrodispersion in variably saturated heterogeneous formations
Numerical models are frequently used in order to quantify the effect of the spatial heterogeneity in the formation hydraulic properties on field-scale solute transport. Because of practical constraints it is common to discretize the flow domain into relatively large numerical cells, with characteristic length scales, l1, l2, l3, comparable with those of the formation heterogeneity, I1, I2, I 3, leading to a loss in the velocity variability, and, concurrently, in solute spreading. We analyzed block-effective dispersion coefficients, D ij′ (i, j = 1, 2, 3), required to compensate for this loss in three-dimensional, variably saturated heterogeneous formations under conditions of steady state, gravity-dominated, unsaturated flow. The results that the principal components of Dij′ are controlled by the ratio l′ = l2/I2 = l3/I3, that they may reach their ergodic limits l′ is sufficiently large, and that their tendency to their asymptotic limits with increasing scaled travel time, t′, is inversely related to l′, are in agreement with previous results for saturated flow. New findings suggest that under unsaturated flow conditions, both the time required to reach the asymptotic limits of D ij′ and the length scale needed to reach the ergodic limits of Dij′ depend on soil stratification, soil texture, and mean soil water saturation and differ for the longitudinal and the transverse components of Dij′.
Scientific Publication
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