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פותח על ידי קלירמאש פתרונות בע"מ -
Soil seal formation and its effect on infiltration: Uniform versus nonuniform seal approximation
Year:
2001
Source of publication :
Water Resources Research
Authors :
אסולין, שמואל
;
.
Volume :
37
Co-Authors:
Assouline, S., Department of Environmental Physics, Institute of Soil, Water and Environment Sciences, Volcani Center, Bet Dagan, Israel
Mualem, Y., Faculty of Agricultural, Food and Environmental Sciences, Seagram Center for Soil and Water Sciences, Hebrew University of Jerusalem, Rehovot, Israel
Facilitators :
From page:
297
To page:
305
(
Total pages:
9
)
Abstract:
Two different approaches to the solution of the problem of flow through the dynamic stage of seal formation as well as through soil with a fully developed seal are studied. The first approach considers the disturbed seal layer and the undisturbed soil underneath as a continuous nonuniform soil profile. The second replaces the nonuniform seal by a uniform equivalent layer, thereby generating a homogeneous two-layer flow system. The depth-dependent properties of the nonuniform seal are expressed in terms of the exponential model of Mualem and Assouline [1989]. The dynamics of seal formation are modeled according to Assouline and Mualem [1997]. During the first rainfall on an undisturbed soil profile, when the seal layer is formed, the application of the first or the second approach has only a minor effect on the calculated infiltration curves. However, there is a significant difference between the two solutions regarding the dynamic changes of the water content in the soil surface and, consequently, within the seal layer. During subsequent rainfalls on a sealed soil profile, when the seal layer is completely developed, the differences between the two ways of accounting for the seal layer become evident, and their effects on the infiltration curve are much more significant. Representing the seal as an equivalent uniform layer increases the ponding time and the infiltration rates at the early stage of the process. The amplitude of these effects is increased when the rainfall rate is higher and the seal layer is thicker. An important result is that the relationship between infiltration rate and cumulative infiltration is unique in the case of a completely developed seal and when the seal is considered as a nonuniform layer. However, this relationship is not unique during seal formation, independent of the approach applied to represent the seal layer.
Note:
Related Files :
Infiltration
sealing
soil property
Soil water
עוד תגיות
תוכן קשור
More details
DOI :
10.1029/2000WR900275
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
20174
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:34
Scientific Publication
Soil seal formation and its effect on infiltration: Uniform versus nonuniform seal approximation
37
Assouline, S., Department of Environmental Physics, Institute of Soil, Water and Environment Sciences, Volcani Center, Bet Dagan, Israel
Mualem, Y., Faculty of Agricultural, Food and Environmental Sciences, Seagram Center for Soil and Water Sciences, Hebrew University of Jerusalem, Rehovot, Israel
Soil seal formation and its effect on infiltration: Uniform versus nonuniform seal approximation
Two different approaches to the solution of the problem of flow through the dynamic stage of seal formation as well as through soil with a fully developed seal are studied. The first approach considers the disturbed seal layer and the undisturbed soil underneath as a continuous nonuniform soil profile. The second replaces the nonuniform seal by a uniform equivalent layer, thereby generating a homogeneous two-layer flow system. The depth-dependent properties of the nonuniform seal are expressed in terms of the exponential model of Mualem and Assouline [1989]. The dynamics of seal formation are modeled according to Assouline and Mualem [1997]. During the first rainfall on an undisturbed soil profile, when the seal layer is formed, the application of the first or the second approach has only a minor effect on the calculated infiltration curves. However, there is a significant difference between the two solutions regarding the dynamic changes of the water content in the soil surface and, consequently, within the seal layer. During subsequent rainfalls on a sealed soil profile, when the seal layer is completely developed, the differences between the two ways of accounting for the seal layer become evident, and their effects on the infiltration curve are much more significant. Representing the seal as an equivalent uniform layer increases the ponding time and the infiltration rates at the early stage of the process. The amplitude of these effects is increased when the rainfall rate is higher and the seal layer is thicker. An important result is that the relationship between infiltration rate and cumulative infiltration is unique in the case of a completely developed seal and when the seal is considered as a nonuniform layer. However, this relationship is not unique during seal formation, independent of the approach applied to represent the seal layer.
Scientific Publication
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